CA1335189C - Adhesive composition, process and product - Google Patents

Abstract

Command-cure compositions especially for use in insulated window assemblies permit the composition to be rendered adhesively bonding at a selected time interval after formation of the assembly to firmly bond opposed surfaces of the assembly; a particular adhesive in strip or tape form comprises an adhesive polymer composition which is transparent to curing radiation especially UV, and curable in the presence of the radiation; the curing is inhibited by oxygen;
the composition is solvent free and cures to a mass resistant to water; surfaces of the adhesive exposed to oxygen remain tacky and uncured; the adhesive is especially useful in window structures in which adhesion of the tacky surface excludes the cure-inhibiting oxygen and the tacky surface can be cured by UV radiation passing through the window glass.

Description

BACKGROUND OF THE INVENTION
i) Field of the Invention This invention relates to adhesive com-positions and products, and to the manufacture of such compositions and products, more especially the invention is concerned with an adhesive composition which can be cured on command or at a desired point in time, and products based on the composition; in parti-cular the invention is concerned with a composition curable by curing radiation, but in which the surface cure is inhibited by oxygen.
ii) Description of the Prior Art Adhesive compositions are employed in a variety of environments in which a bond or seal is to lS be formed between two closely spaced surfaces, and in the manufacture of laminates of different materials.
They may be applied in a flowable form, for example, as a liquid, and allowed to cure or set to a solid mass in situ; or they may be applied in a tape form in which the adhesive composition forms a coating or layer on a supporting substrate or film.
Such compositions are usually multi-component formulations in which two or more components are ad-mixed at the time of use whereafter chemical reaction between the components to form a cured composition ommences. If the cure proceeds rapidly the formu-~ - 2 - 1335189 lation must be employed without delay. If cure retardants are employed to delay or retard the cure, prolonged periods are required to complete the cure, and in some cases this means that the product must be stored in a controlled atmosphere over a period of days to allow the cure to complete.
Various mastic products, for example, sealants and preformed tapes and strips are known for mounting window glass. These mastic products are employed to bond sheets of window glass together adjacent their peripheral edges, in spaced apart relationship with an air space therebetween; they are also employed as bonding mediums and sealants between the window glass and the supporting frame structure which is typically of metal.
The problems associated with retarded cure of adhesives are experienced in the window industry with these mastic products wherein stacks comprising pairs of bonded together window glass must be stored for several days to allow the cure to complete.
These mastic products contain a solvent and are flowable, uncured polymer materials. The flowable nature presents handling problems and may also result in undesirable migration of the polymer material across the window glass surface, which is aesthetic311y unacceptable.

In addition to their adhesive character, these mastic products are required to display other characteristics having regard to the environment in which they are to be used. Thus mastic products employed as sealants in window structures should be weather resistant and impermeable to moisture and water.

SUMMARY OF THE INVENTION
It is an object of this invention to provide a method of bonding layers, especially glass layers in which a non-bonding polymer composition is rendered adhesively bonding at a selected time interval after introduction of the non-bonding polymer composition between the layers.
- It is a further object of this invention to provide compositions and products, including tape products, for carrying out such method.
It is still another object of the invention to provide new adhesive compositions and products containing them which are substantially solvent free.
The invention is more especially concerned with adhesive compositions, products and methods for use in window structures.
The invention contemplates a method and composition which provides a so-called "comm;~nd-cure"
of a non-bonding polymer composition, where~y the com-~ 4 ~ 1335 189position is rendered adhesively bonding.
The expression "command-cure" contemplates that an otherwise non-bonding-polymer composition is rendered adhesively bonding at a selected point in time. The point in time is chosen by the user of the composition.
In one embodiment the non-bonding polymer composition is rendered adhesively bonding by affect-ing a cure of the composition, however, other techniques whereby a non-bonding polymer composition is rendered adhesively bonding, and which do not involve a cure, are also contemplated. A technique involving a temporary change in the physical state, for example, melting or temporary reversal of crystallinity, of the non-bonding polymer composition whereby it becomes adhesively bonding, and is there-after restored to its original state while maintaining the adhesive bond is also contemplated by the invention.
The expression "non-bonding polymer com-position" contemplates a composition in a state inwhich it does not form a firm adhesive bond sufficient to permanently secure two layers together; the com-position may, however, be sufficiently adhesive or tacky to form a weak bonding between layers, sufficient as a temporary holding means during careful assembly and handling. The expression "adhesively bonding"

1335l89 contemplates a composition in a state in which it forms a firm, substantially permanent bond.
Thus in one aspect the invention provides a method of bonding self-supporting layers in opposed facing relationship which comprises intro-ducing a non-bonding polymer composition adapted to be rendered adhesively bonding between opposed surfaces of the layers to form an assembly and subsequently rendering the composition adhesively bonding at a selected time interval after formation of the assembly to firmly bond together the opposed surfaces of the layers.
In another aspect of the invention there is provided a composite of such layers bonded together.
In accordance with another aspect of the invention there is provided an adhesive polymer com-position which is transparent to curing radiation, and curable in the presence of such curing radiation, the curing being inhibited by oxygen. In particular the composition is substantially solvent free and when cured is substantially resistant to water.

In one embodiment there is provided an adhesive polymer strip formed from the composition.
The strip has a shaped body portion and at least one exposed surface portion; the composition is sub-stantially cured throughout the body portion and uncured at the exposed surface portion such that the surface portion remains tacky.
In another embodiment of the invention there is provided a flexible adhesive tape in which the adhesive polymer composition is present as an adhesive layer on a flexible substrate. The adhesive layer has a shaped body portion and a first outer surface portion remote from the substrate; the composition is sub-stantially cured throughout the body portion and uncured at the first outer surface portion, so that such outer surface portion remains tacky.
In another embodiment of the invention there there is provided a flexible sealant strip comprising:
a deformable substrate and an adhesive layer supported on said substrate, said adhesive layer having a body portion and a first outer surface, a spacer element extending between opposed sides of said tape effective to resist compressive forces applied to said substrate, said adhesive layer being transparent to curing radiation and comprising an adhesive polymer com-~ 7 ~ 1335189 position curable in the presence of the curingradiation, the curing being inhibited by oxygen, said composition being substantially cured throughout said body portion and uncured at said first outer surface portion, such that said first outer surface portion remains tacky.

In another embodiment there is provided a laminate which comprises first and second self-support-ing layers substantially opaque to curing radiation, in opposed facing relationship and an adhesive layer of the adhesive composition therebetween. The adhesive layer has a pre-shaped body portion and opposed first and second outer surface portions in con-tacting relationship with the self-supporting layers.

- 8 - 133~189 ~he adhesive layer is substantially cured throughout the body portion, and at least partially uncured at the outer surface portions, such that the outer sur-face portions are sufficiently tacky to provide adhesion between the self-supporting layers and the adhesive layer.
In still another embodiment of the invention there is provided a sealant which comprises the adhesive composition in pumpable form having a viscosity of at least 50,000 cps, and preferably at least 100,000 cps~
measured at~25C. effective to render the composition non-sagging in the pumpable state when applied in a thickness of at least 0.0625 inches. In particular the viscosity may be achieved by partial curing of the composition.
In yet another embodiment of the invention there is provided a method of producing an adhesive composition transparent to and curable by curing radiation, the curing being inhibited by oxygen, comprising reacting a long chain polymer material having a plurality of non-terminal side functional groups with a side chain-forming compound having a first end functional group which is reactive with the side functional group, and a second end vinyl group remote from the first end functional group, to form a long chain polymer material having a plurality of short pendant side chains, with terminal vinyl groups, and admixing the long chain polymer material with a cross-linking agent effective in the presence of cur-ing radiation and absence of oxygen to form cross-linking bridges containing the vinyl groups.
The modified polymer material bearing side chain terminal vinyl groups is flowable, by which is meant that the material is liquid or mobile or can be rendered liquid or mobile at moderate elevated temperatures such that the mixture of modified poly-mer material, cross-linking agent and other optional additives can be extruded, cast, coated or otherwise applied to a substrate surface.
DESCRIPTION OF PREFERRED EMBODIMENTS
i) COMMAND-CURE
By means of the invention an assembly of two windows, for example, glass or plastic windows, can be formed in which the opposed faces of the windows are held together with the non-bonding polymer com-position therebetween, adjacent peripheral edges of the windows, the windows being separated to provide an insulating space therebetween.
The assembly may rely on the tacky nature of at least the surface of the composition to ~emporarily - lo - 13~5189 hold the windows together ln opposed facing relation-ship, and thereafter, at a selected time, the com-position may be rendered adhesively bonding to firmly bond the windows together in their opposed facing relationship. The adhesive bonding character may be triggered in several ways, for example, heat, U.V.
radiation or microwave radiation.
In accordance with the invention a number of techniques have been developed to provide the "command-cure" feature:
a) Photo-cure Adhesives These adhesives are cured in the presence of ultra-violet radiation and the absence of oxygen.
Thus a shaped flexible strip may be formed which is lS cured throughout its body but tacky and uncured at a surface exposed to oxygen. The tacky surface is applied to a glass surface thereby exclusing oxygen.
Exposure of the uncured tacky surface to ultra-violet radiation, at a selected time, results in rapid cure at the surface of the shaped strip to form a firm adhesive bond between the glass surface and the strip.
The ultra-violet radiation for the "command-cure"
is suitably directed through the glass or through the material itself.

- - ll - 133SI89 The photo-curable adhesives or sealants are in particular, acrylates which polymerize by a free radical mechanism initiated by ultra-violet light.
The compounding ingredients employed should suitably S be transparent to ultra-violet light in the U.V.
range of the spectrum, especially the 300 to 400 nano-meter range with particular attention to 365 nano-meters which is the frequency of most industrial U.V.
ovens.
Adhesives or sealants made with photo-sensitive monomers can be used in two manners:
i) The entire adhesive or sealant may be comprised of a compounded acrylate .
ii~ The acrylate may be coated on a carrier, - for example, a pre-cured butyl, neoprene and EPDM rubber which serves as the main body of the sealant system and derives its adhesion from the photo-sensitive material which is coated onto the contacting surfaces prior to assembly of the insulating glass unit. This can be done either at the time of manufacturing of the sealant system or by the user of the system at the time of application.

Employing system ii) a composite comprising the acrylate coated on a carrier is applied to an insulating glass assembly and cured by exposing the assembly to an ultra-violet light source. This cure is effected in a matter of seconds or minutes depending on the concentration of the light source.
The photo-sensitive adhesive may also be applied to the normal spacer bar, typically of aluminum, used in fabrica~ing an insulating glass unit. Cure may then be effected by exposure to an RS-l sunlamp for fifteen minutes.
b) Capped Urethanes Curing of a urethane-forming composition based on an isocyanate and a compound, for example, a polyol, containing active hydrogen atoms for reaction with the isocyanate to form the urethane, is blocked by capping the isocyanate chemical with a blocking or capping agent, for example, nonyl phenol, which can be removed to liberate the isocyanate groups at relatively mild elevated temperatures, for example, 115C.
Thus by blocking the activity of toluene diisocyanate (TDI) with a capping agent, for example, nonyl-phenol it is possible to introduce the curing capability of TDI into a urethane pre-polymer and retain storage stability. When the adhesive or sealant mixture is heated to a moderate temperature the nonyl-phenol splits off from the TDI and permits it to effect the normal curing process of a urethane.
S The composition may be employed as a coat-ing on spacer members or the like disposed between pairs of glass windows to form a window assembly.
The assembly is heated to remove the capping agent fromthe lsocyanate whereafter the curing proceeds to form a firm urethane adhesive bond.
c) Anaerobic Cure Compositions of this type cure in the absence of oxygen to form a firm adhesive bond. They may be employed as a coating as in the case of the capped urethanes. On exclusion of oxygen, as when the coated spacer is sandwiched between opposed glass surfaces, the cure will commence to form a firm adhesive bond.

- 14 - 133~189 The anaerobic family of adhesives or sealants is somewhat similar to the U.V. curables in that they may be applied either at the time of manu-facture or at the time of application. That is to say, a coating of anaerobic adhesive can be applied to a carrier of, for example, butyl, EPDM or neoprene rubber extrusion by the sealant manufacturer or by the fabricator of insulating glass at the time of manufacture.
The cure is effected by exclusion of oxygen _ from the space occupied by the anaerobic adhesive.
This triggers a latent cure.
The use of an anaerobic system offers the advantage that external energy, for example, heat or light, is not necessary.
In one embodiment anaerobic adhesive was coated directly on the conventional spacer bar, typically of aluminum, of a window assembly. Later, the insulating glass assembly was completed using two lites of glass on either side of the spacer bar. The only "trigger" required is to press the glass intimately with the spacer bar which results in exclusion of oxygen and effects chemical cure of the anaerobic coating. The same procedure was also used in coating an elastomeric carrier of EPDM, butyl and -- 15 - 1 33~189 r.eoprene rubbers in place of the aluminum spacer bar and effecting the latent cure by pressing the assembly together to exclude oxygen.
d) Melt-Crystallinity Reliance can be made on the temporary change in physical characteristics produced by heat. A neo-prene strip can be employed in the manner of the photocure adhesive above.
The assembly of strip and glass panes is subjected to heat or microwaves sufficient to raise the temperature so that the neoprene melts at the surface and will then wet the glass surface. In order to achieve this the surface of the neoprene must be raised to the crystallinity temperature.
Upon cooling the neoprene recrystallizes to form a firm adhesive bond with the glass surface.
Neoprene is especially suitable because it has a low temperature requirement for reversing crystallinity. Nitrile films which cure as a result of heat pressure may also be used.
Neoprene (chloroprene) rubber is available in grades which are quite crystalline. This crystal-linity is completely thermally reversible. At normal ambient conditions the elastomer is rubber-like in nature in large part due to its crystalline structure.

As the temperature approaches or exceeds 158F the elastomer looses its crystalline structure and becomes thermoplastic. This renders it easily compressible and with suitable incorporation of other ingredients a tacky, adhesive extrusion can be made.
A mastic based on neoprene and additives may be extruded and used as the spacer between two lites of glass. The insulated glass assembly may then be heated by passing it through an infrared oven to a temperature of 165F. At this temperature the neo- _ prene extrusion is easily compressed by passing it through a series of compression rollers. After the assembly cools down to ambient condition, the crystallinity of the neoprene returns and an elasto-meric bond is obtained between the spacer and thelites of glass.
This system is not a true chemical cure but because of the reversible crystallinity, the same effect results as if it was chemically cured. The same procedure can be obtained using other elastomers, for example, styrene-butadiene elastomers such as those marketed under the Kraton trade mark of Shell and the Vamac (trade mark of Dupont) elastomers.

e) Plastisols Plastisols can be rendered adhesive by incorporation of silanes and can be modified to make them elastomeric with liquid nitrile rubber.
Shaped strips may be formed by extruding the plastisol with a fibrous material, for example, cellulosic fibres or asbestos fibre. The "cure"
is produced by heat or microwave radiation which produces a change in the physical state to provide a firm adhesive bond.
Plastisols are compounds made up of poly-vinylchloride and/or polyvinylchloride-polyvinyl-acetate resins dispersed in suitable plasticizers, for example, phthalates, aliphatic petroleum oils and polymeric polyesters. To this dispersion other ingredients may be added to obtain desirable pro-perties, for example, calcium carbonate for reinforce-ment and for cost considerations, silanes for their adhesive properties, pigments for color, scavengers for chloride ions, for example, calcium oxide, epoxys and oxides of lead for stabilization.
Mixtures of the ingredients are suitably made to a desired consistency for application, for example, by gunnin~ through a pumping system or by pre-extruding into tape for placement into an insulat-ing glass assembly at a later time.

- The plastisols remain "uncured" until suf-ficient heat is applied permitting the solution of the vinyl resins by the plasticizers. Once such solution takes place, the plastisol changes its characteristics from a deformable mastic to a per-manen~ly elastomeric rubber-like material. A typical heat cycle to effect this flux is 325F for 15 minutes but this is adjustable dependent on the mass of the sealant and insulating glass components.
f) Bound Moisture A particulate molecular sieve material having bound water is dispersed throughout a formu-lation which cures in the presence of water. Exposing the material to heat or microwave radiation releases the water from the molecular sieve into the formu-lation to effect the cure.
g) Epoxy Cure Expoxy resins can be employed in a heat activated command cure.
There are many heat activated curing systems for epoxy resin based sealants. One of the most reliable involves the use of dicyandiamide (Dicy) and a polymeric epoxy. A blend of epoxy powdered dicy and pigment forms a shelf stable sealant which ~5 cures only at elevated temperatures, typically beingcured in 15 minutes at 350F.

-h) Butyl-Chlorobutyl Latent cure systems are possible with butyl and chlorobutyl elastomers. The triggering means is the application of heat. The cure system can be based on chloro or bromophenolic resins. These can be compounded with the base elastomer and will remain relatively stable for a day or weeks depending on storage conditions. The adhesive or sealant can be either pumpable or in the form of an extruded tape.
ii) RADIATION-CURABLE ADHESIVE COMPOSITION
Radiation-cure adhesive, especially photo-cure adhesives, represent an especially preferred form of command-cure adhesives.
The adhesive composition is, in particular, a polymer composition comprising an adhesive mixture of a long chain polymer material modified by the intro-duction of short pendant side chains, which side chains have terminal vinyl groups, and a di- or poly-functional cross-linking agent effective to react with the vinyl groups under appropriate conditions whereby bridges are formed between vinyl groups in different polymer chains to cure the modified polymer material.

In particular, the cross-linking occurs in the presence of curing radiation, and the cross-linking or curing is inhibited by oxygen.
The modified polymer and the cross-linking agent are selected such that an uncured mixture forming the adhesive composition is transparent to the curing radiation to a depth of up to 1.0, more generally up to 0.75 inches. This means that the composition is trans-parent to the radiation for a depth up to 1.0 inches measured from the surface of the composition on which_ the radiation is incident; this depth is referred to herein as the transparent depth.
More especially the composition will have a transparent depth of not more than 0.5 inches and typically not more than 0.25 inches.
The thickness of the composition which can be cured is proportional to the transparent depth. In particular, the maximum thickness of composition which can be cured is twice the transparent depth of the composition, for the case in which a layer or coating of composition is exposed to the curing radiation from opposite sides of the layer or coating.
Thus the composition can be maintained in the uncured state by excluding the curing radiation, for example, by maintaining the composition in an enclosure 1~35189 opaque to the curing radiation.

The curing of the composition is inhibited by oxygen and so the presence of oxygen dissolved in or otherwise occluded or entrained within the composition is to be avoided. In this regard the composition is suitably substantially free of gaseous oxygen. In so far as the outer surface portion of the composition is open to the atmosphere and thus exposed to oxygen gas, the outer surface portion of the composition will remain tacky even though the body portion is cured under the action of curing radiation penetrating the composition. The tacky surface portion can be adhered to a surface of a substrate so that access of oxygen to the surface portion is excluded. If curing radiation is able to penetrate to the tacky surface, either through the substrate, if it is transparent to the curing radiation, or through the body portion of the cured composition in so far as it is transparent to the radiation, the tacky outer surface portion will be cured. If the substrate is opaque or if, in any event, the tacky portion is not exposed to the curing radiation, it will remain tacky.

The composition suitably has a viscosity of at least 50,000 cps and preferably 100,000 cps at 25C.
and is pumpable. The composition is non-sagging in the pumpable state when applied in a thickness of at least 0.06Z5 inches. By non-sagging is meant that the composition can be applied in the pumpable state between a window pane and supporting frame separated by a spacing of at least 0.625 inches, and the com-position will fill the space and not flow out.
The composition may contain conventional additives to impart known, desired characteristics, for example, adhesion promoters, plasticizers, photo-initiators, stabilizers, pigments and fillers.
a) Unmodified Polymer In particular, the unmodified polymer is a long chain polymer material having a M.W. of 2,000 to 100,000, preferably 10,000 to 60,000, and may, in particular, be an acrylate polymer having a plurality of side functional groups selected from carboxyl, hydroxyl, mercapto, acrylonitrile or acrylamide.

~ - 23 - 1335189 Particularly suitable unmodified polymer materials are copolymers, terpolymers and tetra-polymers based on acrylic monomers. Suitable monomers include ethylacrylate, butylacrylate, 2-ethylhexyl-acr~late, ~ -carboxyethylacrylate, hydroxypropyl-acrylate, acrylic acid and acrylonitrile.

b) Modified Polymer In accordance with the invention the unmodified polymer is modified at the side functional ,10 groups to introduce the short pendant side chains bea~-ing the terminal vinyl groups.
The introduction of the short pendant side chains is achieved by a reagent having, on a molecular level, a functional radical at one end of the molecule which will react with a side functional group of the unmodified polymer, and a vinyl group at the other end of the molecule.

The vinyl group in the reagent is preferably an acrylate group. The functional radical reactive with the side functional groups may, in particular, be an epoxy, hydroxy, isocyanate or aziridinyl radical, or a carboxylate of a polyvalent metal.
Suitable reagents include glycidyl methacry-late; ~inc diacrylate or dimethacrylate; zinc(hydroxy)-acrylate; calcium diacrylate or dimethacrylate;
chromium (III) diacrylate or dimethacrylate; zirconium diacrylate or dimethacrylate; tributyl tin acrylate and 2-(1-aziridinyl) ethyl methacrylate, and a reaction product of a diisocyanate and a hydroxyalkylacrylate, for example, methylene-bis-cyclohexyl isocyanate hydroxyalkyl acrylates, for example, hydroxypropyl acrylates.
Thus the modifying reagent may be a metal di-or triacrylate or a metal hydroxy acrylate of formula (I):

(H)mMe An (I) in which Me is a metal, A represents an acrylate radical, x is an integer of at least 2, n and m are both integers of at least 1 and n + m = x.
The modifying reagent may be an epoxy com-~and of formula (II):

CH / \CH -(CH2) A (II) - 25 - 133~189 in which A is as defined above and p is an integer of at least 1.
The modifying reagent may also be an aziridinyl compound of formula (III):

~N-(CH2)p-A (III) in which A and p are as defined above.
The modifying reagent may also be an acid of formula (IV):

A -(CH2) COOH (IV) p wherein A and p are as defined above.

The modifying reagent may also be an iso-cyanate of formula (V) or (VI):

OCN-R -A (V) OCN-R -NHCOO-R A (VI) wherein R and R are the same or different and are aliphatic, cycloaliphatic or aromatic structures con-taining one or more rings; for example, alkylene, cycloaikylene or arylene having a carbon atoms range of 2 to 18.
In particular the acrylate radical A is of formula (VIII):

O CH2 = C - C - O - (VII) in which R is a hydrogen atom or alkyl of l to 4 carbon atoms, preferably methyl.

c) Cross-Linking Agent The cross-linking is effected with a poly-functional cross-linking agent in which the functional groups react with vinyl groups. A di-functional cross-linking agent will react with pairs of vinyl groups, more especially pairs in which the vinyl groups are in different or separate polymer chains of the polymer material. A trifunctional cross-linking agent can re-act with up to three such vinyl groups.
By appropriate selection and amount of the cross-linking agent, flexible cross-linking bridges can be formed to cure the modified polymer material to form a resilient or flexible cured adhesive polymer.
The cross-linking agent and terminal vinyl groups are selected such that the curing requires cur-ing radiation, and the complete curing is inhibited by oxygen.
The cross-linking agents are, in particular, selected to match the modified polymer material having regard to the desired characteristics of the adhesive.
Particularly suitable cross-linking agents for use with the acrylate based polymers are di- and tri-acrylates.
In this way flexible bridges are formed between the polymer chains which produce resilience and flexibility which is a desirable characteristic for many applications including the mounting of window glass.

- Furthermore the di-, tri-, or polyfunctional cross-linking reagent preferably of acrylate functionality, may react with a reactive diluent, for example, a monoacrylate such as caprolactone acrylate or plasticizer and the acrylate functionality of the modified polymer material under radiation conditions to give a cross-linked network of the desirable physical properties. Typical examples of difunctional acrylates are: ethylene glycol diacrylate; diethylene glycol diacrylate; tetramethylene glycol diacrylate; ~
polyethylene glycol diacrylate; 1,3-butylene glycol diacrylate; 1,4-butanediol diacrylate; dimethylene glycol diacrylate; 1,6-hexanediol diacrylate; 2,2-dimethylpropane-1,3-diacrylate; tripropylene glycol diacrylate; ethoxylated bis-phenol-A-diacrylate;
zinc diacrylate; and their dimethacrylate homologues.
Typical trifunctional acrylates are: tri-methylolpropane triacrylate; ethoxylated trimethylol-propane triacrylate; and pentaerythritol triacrylate.
Typical polyfunctional acrylates are:
pentaerythritol tetraacrylate; dipentaerythritol monohydroxy pentaacrylate.

133~189 Glycidyl methacrylate, glycidyl acrylate and 2-(1-aziridinyl) methacrylate are suitable as poly-functional acrylates in the presence of chemical species which polymerize the three-membered rings.
The cross-linking agent may also be selected from higher molecular weight acrylates, for example, the so-called urethane acrylic oligomers prepared from di- or tri-functional alcohols (diols and triols) after reaction with excess diisocyanate to give a tri-functional isocyanate and conversion of the isocyanate groups with hydroxyethylacrylate or hydroxypropyl-acrylate to provide the desired acrylate functionality.
Isocyanate functionality can be introduced with aromatic or aliphatic diisocyanates. Residual isocyanate functionality on these polymers can lead to desirable cross-linking with polyhydroxy components in the formulation. This can be advantageous in applicationswhere the depth of light-initiated cure in the preferred case of cure by UV radiation, is not sufficient or when adhesion to a substrate is required which contains surface functionalities reactive with isocyanates. Such reactive polymers are difunctional, but essentially monofunctional with respect to their isocyanate or acrylate groups; that is, each polymer ~ 30 - 1335 189 contains on average one acrylate and one isocyanate group. Similarly, a fraction of the number of the acrylate functionality of the tri- or tetraacrylates can be isocyanate functionality. To increase the efficiency of these isocyanates, conventional catalysts such a-s tertiary amines can be included in the formulation, or as part of the initiator.

Such isocyanates can also be effective when the polymers contain hydroxy functionality, either as the result of the polymer modification or by using initiators for the polymerization which introduce hydroxy functionality.
The acrylate polymers can be based on poly-esters or polyethers with terminal hydroxy functionality or similar polymers with more than two hydroxy groups.

The pendant vinyl groups of the modified polymer themselves permit radiation cross-linking, so that the addition of a di- or polyfunctional cross-linking agent may not be required, depending on the properties, for example, flexibility, desired. For example, when acrylates are used as polymer modifying agents, radiation cross-linking may occur even if the polyfunctional cross-linking agent is not present.

d) Curing Radiation The curing radiation is suitably UV
radiation having wavelengths of between 250 and 800 nm, preferably between 250 and 450 nm. However, electron beam radiation, microwave and heat radiation may also be employed as curing radiation although these are less preferred.

e) Additives The compositions may contain one or more con-ventional additives depending on the physical characteristics required including adhesion promoters, plasticizers, photoinitiators, stabilizers, pigments and fillers.
Adhesion promoters are materials which increase the adhesion of the cured product to various surfaces such as glass and metals. Adhesion promoters can be added to the composition or can be co-polymerized into the polymer material.
Typical examples are: acrylic acid, /~-carboxyethyl acrylate, silanes and titanates.
The adhesion promoters may also be applied to the surface on which the composition is to be applied. It may also be appropriate to apply an adhesion promoting primer, for example, acrylate, amino and mercapto-functional silanes, for example, mercaptopropyl trimethoxysilane and aminopropyl tri-methoxysilane and a mixture of aminopropyl trimethoxy-silane and a copolymer of butylacrylate-acrylic acid (60:40).
Plasticizers are reactive diluents which increase the flexibility of the cured product parti-cularly at low temperatures. The materials selected ~ 33 ~ 133S189 are those which can be chemically bound into the net-work so that the product contains a minimum level of volatile components. Typical examples of such reactive diluents are: isodecyl acrylate, isobornyl acrylate, dicyclopentenyloxyethyl acrylate, cyclohexyl acrylate, tetrahydrofurfuryl acrylate, lauryl acrylate, 2-ethoxyethoxyethyl acrylate, phenoxyethyl acrylate, 2-(1-aziridinyl)-ethylmethacrylate, N-vinyl-2-pyroli-done, N-isobutoxymethyl acrylamide.
Photo-initiators are used to increase the rate of cure in the case of cure by UV radiation. The choice of photo-initiator depends on several factors, such as the light source, the presence of fillers in the formulation, and the desirable colour of the product. Typical examples are: benzophenone, 2,2-diethoxyacetophenone, diethoxyphenylacetophenone, IRGACURE 184, (trade mark of Ciba-Gei~y for l-hydroxy-cyclohexyl phenyl ketone), IRGACURE 907 (trade mark of Ciba-Geigy for 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropanone-l), SANDORAY 1000 (trade mark of Sandoz~, DAROCURE 1173 (trade mark of E. M. Chemicals), UV Absorber 0505 (Van Dyke ~ Co.), CYRACURE UVI-6990 (trade mark of Union Carbide).

13~5189 Combinations of initiators and sensitizers can lead to synergistic effects. Particularly effective are combinations of aryl ketones and a tertiary alkanolamine such as N-methyldiethanolamine.
Alternatively, the photoinitiator may contain both functional groups. Other co-initiators are methylthio-xanthone and the ethyl ester of p-dimethylaminobenzoic acid.
If the photo-initiator is insoluble in the acrylate, it may be advisable to dissolve it in a component of the formulation rather than in the total mixture to be photo-cured.
Stabilizers improve the weathering characteristics of the cured product; it may be advantageous to add photo-antidegredants. A suitable combination, for instance, consists of, by weight, 2% of Irgacure 184 and 0.5% of Tinuvin 292, both trade marks of Ciba-Geigy.
Pigments and fillers are selected for dif-ferent purposes. Light-transparent fillers such as silica are preferred if the penetration of UV light into deeper sections of a photo-curable material is required.

However, the filler may be chosen to be such that it participates in the cross-linking. In the case of photo-cross-linking this can be achieved by using metal salts of photo-cross-linkable acids such as the zinc salts of acrylic acid, methacrylic acid and ~ -carboxyethyl acrylic acid.
f) Methods In manufacturingthe unmodified polymer material the monomers are polymerized in the absence of a solvent or in t~e presence of a solvent which can be readily removed after polymerization, for example, toluene or xylene. If no solvent is employed, the initiator for the polymerization is dissolved in the monomer mixture, which usually requires cooling the mixture to maintain a temperature at or below 25C.
during the polymerization; or the initiator is metered into the reaction mixture during the polymerization, the level of inhibitor is also controlled and maintained.
In the absence of solvent, viscosity of the polymerization mixture increases as the polymerization proceeds resulting in the need for high torque mixing.
Suitable polymer materials which are designed to become cross-linkable after modification, especially photo-cross-linkable are based on acrylic monomers such as methylacrylate, ethylacrylate, butylacrylate and hydroxypropylacrylate and their homologues as well as the corresponding methacrylates.

- 3~ - I 3351 89 As indicated the polymerization may be carried out with or without solvent. If a solvent is selected, its boiling point should be sufficiently low to facilitate its removal at the end of the poly-merization, should a totally solvent-free polymer be required.
Co-monomers in the acrylate polymer can con-tain other functional groups. For example, the hydroxyl group may be introduced using 1- or 2-hydroxyethyl acrylate or 3-hydroxypropyl acrylate. Other suitable functional monomers are: acrylonitrile, 2(1-aziri-dinylethyl) methacrylate, carboxyethyl acrylate, acrylamide and caprolactone acrylate.
Initiators suitable for preparing the acrylates are peroxides and azo-type initiators.
It can be advantageous to choose an initiator which introduces a terminal functional group into the polymer, such as 3-hydroxy-1,1-dimethylbutyl peroxyneo-heptanoate or l,l-dimethyl-hydroxybutylperoxy-2-ethyl-hexanoate.
The polymerization can also be carried out bygroup transfer initiation, which permits the intro-duction of acrylate end groups into the polymers or the defined placement of acrylic acid groups into the polymer backbone. Such a defined placement permits a control of the subsequent polymer modification, and may improve the physical properties of the cross-linked product. The terminal acrylate groups make it possible to increase the molecular weight of the polymer during the photo-polymerization by reaction with reactive acrylate diluents.
When the polymer material is produced in a solvent such as toluene or xylene, these solvents can be subsequently removed by stirring the polymer mate-rial under vacuum at 20-150C. until a solids level of more than 95% is obtained.
The polyfunctional reagents with which the polymer material is to be modified are mixed into the polymer material and the mixture is stirred at elevated temperatures. The reaction of glycidyl methacrylate with polymer material based on acrylate comonomers is typically carried out at 20-140C. over a period of up to about two hours. The treatment of polymer mate-rial based on acrylate comonomers with zinc diacrylate is typically carried out under stirring at 60-100C.

- 38 - 133S ~89 Preferably acrylates or substituted acrylates, for example, alkyl acrylates may be used as the poly-functional modifying reagents depending on the desired reaction rate.
It is sometimes advantageous to add these polymer modifiers to the polymer material before other ingredients are added and carry out the chemical poly-mer modification thermally by heating the polymer material and its modifier at a temperature sufficient to cause a reaction of one of the functional groups on the modifying reagent without significant reaction of a second functional group. The reaction of the second functional group causes cross-linking of the polymer material. Some degree of this cross-linking may be suitable to increase the viscosity of the polymer material.
The polymer modifiers may also be added together with the other ingredients such as the reactive diluent, the cross-linking agent and photo-initiator.
The cure can be achieved on exposure to ultra-violet radiation, for example, low intensity lamps or solar radiation. Solar radiation can be sufficiently effective even behind double glazed windows, provided that the sample thickness is low or the time of exposure is sufficiently long.

The adhesive composition may be formed as a layer or coating at least 0.0625 inches thick on a flexible support substrate or carrier. Generally the layer or coating will have a thickness of 0.0625 to 0.5 inches. The layer or coating is exposed to curing radiation, especially UV radiation having wavelengths between 250 and 400 nm to cure the body of the layer as a resilient shaped body. Surfaces of the layer exposed to oxygen remain uncured and tacky.
The flexible support substrate may serve as a temporary carrier subsequently to be removed to expose a second uncured tacky surface. This second surface may be maintained uncured during its adhesion to the substrate by treatment of the substrate with an oxygen-enriched primer.
The flexible support substrate may also serve as a permanent substrate to which the adhesive layer is securely bonded, for example, a mastic rubber layer.

Instead of employing a separate discrete substrate, the adhesive composition may be blended with a mastic rubber to form a shaped layer in which the adhesive at the surface remains tacky and uncured in the presence of oxygen.
Suitable mastic rubber compositions can be based on butyl rubber, styrene-butadiene copolymers and others or mixtures thereof.
The invention is illustrated by reference to the accompanying drawings which illustrate particular embodiments, in which:
FIGURE 1 is an end cross-section of a tape of the invention which may be rolled or coiled on itself for storage and transport.
FIGURE 2 is a schematic representation of an automobile window bonded with the tape of Figure 1 to an automobile structure.
FIGURE 3 is a representation of another tape product of the invention.
FIGURE 4, appears on the same sheet as Figures 1 and 2 and is an end cross-section of the tape product of Figure 3 of the invention.

FIGURE 5 is an end cross-section of still another tape product of the invention.
FIGURE 6 appears on the same sheet as Figures 1 and 2 and is a schematic representation of a double window bonded with the tape of Figures 3 and 4.
FIGURE 7 appears on the same sheet as Figures 1 and 2 and is a representation similar to that of Figure 6 employing the tape of Figure 5.
FIGURE 8 is a schematic representation of a double window mounted in a frame employing the tape of Figure 1.
FIGURE 9 appears on the same sheet as Figure 3 and illustrates schematically an in-line process for producing the tape of Figure 1.
FIGURES lOA, lOB and lOC, illustrate schematically double windows adhesively bonded with different command cure formulations of the invention.

-With further reference to Figure 1, a tape 10 comprises an adhesive layer 12 on a support film 14. Adhesive layer 12 has a cured body 16, a tacky outer surface portion 18 and a tacky inner surface portion 20.
Support film 14 has release coatings 22 and 23, for example, a silicone coating on its outer and inner surfaces.
With further reference to Figure 2, a window assembly 24 comprises a glass pane 28 mounted on an automobile structure with an air space 30 therebetween.

- 43 ~ 1335189 Opposed inner surfaces of the structure 26 and pane 28 are bonded together adjacent their peripheral edges by the adhesive layer 12 derived from the tape 10 of Figure 1. In mounting such an assembly the tacky surface portion 18 is contacted with peripheral edge of glass pane 28, to bond the tape 10 to pane 28.
Thereafter, the support film 14 is removed from adhesive layer 12 to expose tacky surface portion 20, and glass pane 28 with layer 12 thereon is applied in opposed facing relationship with structure 26 and adhered by tacky surface portion 20. The release coating 23 permits ready removal of film 14 from layer 12.
The adherence of tacky surface portions 18 and 20 to the pane 28 and structure 26 respectively results in exclusion of oxygen from the surface portions 18 and 20, whereafter exposure to curing radiation, for example, U.V. radiation passing through pane 28 results in cure of the surface portions 18 and 20 to produce cured contact surfaces 34 and 36 to provide a permanent bond.
In particular, layer 12 is curable by U.V.
radiation having wavelengths between 250 and 400 nm and has a thickness of 0.0625 to 0.5 inches.

~ _ 44 _ 1335189 With further reference to Figures 3 and 4, a tape 38 includes a rubber layer 40 and an adhesive layer 42 separated by a spacer strip 88 which may be, for example, of metal or plastic. Adhesive layer 42 includes a cured body 44, a tacky outer portion 46, tacky side portions 47 and a cured contact surface 48.
The spacer strip 88 in particular is undulat-ing to provide flexibility to the tape 38. More especially the spacer strip may be a corrugated metal ribbon having spacer side edges. The tape 38 may be employed in bonding glass panes together in a manner analogous to those illustrated in Figures 6 and 7.
With further reference to Figure 5, a tape 50 includes upper and lower rubber layers 52, a spacer 54 and adhesive layers 56. Each adhesive layer 56 includes a cured body 58, an outer tacky surface portion 60 and an inner cured contacting surface 61.
In a variant of Figure 5, the spacer 54 may be omitted and the layers 52 then form a single layer which may consist of plastic, rubber or metal. The single plastic, rubber or metal layer 52 to which the layers 56 are adhered may contain a typical desiccant such as a molecular sieve. In the case of a metal layer 52 the desiccant would be contained in a hollow tube provided with perforations or narrow openings to allow contact between the desiccant and moisture in the air, specifically the gases between two glass panes, as in Figure 7.
With further reference to Figure 6, a window 62 includes glass panes 64 and 66 with an air space 68 therebetween. The panes 64 and 66 are bonded together with tape 38 of Figure 3. In particular, opposed surfaces of the panes 64 and 66 are bonded adjacent their peripheral edges by the tacky side portions 47 of adhesive layer 42. On bonding of the panes 64 and 66 by tacky side portions 47, oxygen is excluded from the side portions 47 and these portions may be cured to produce cured contact sides 70 by curing radiation, for example, ultraviolet radiation passing through glass panes 66 and 64.
With further reference to Figure 7, a window 72 comprises glass panes 74 and 76 separated by an air space 78. The panes 74 and 76 are bonded together adjacent their peripheral edges by the tape 50 of Figure 5. In particular the tacky surface portions 60 of tape 50 are employed to bond the panes 74 and 76 which results in exclusion of oxygen from the surfaces 60 whereafter they are cured to provide the cured contact surfaces 80, for example, by U.V. radiation passing through glass panes 72 and 76.

With further reference to Figure 8, a window 150 comprises glass panes 152 and 154 mounted in a frame 156. Panes 152 and 154 are separated by a spacer 158 and sealed at their peripheral edges by a sealant 160 to define an air space 162 therebetween.
Window 150 is mounted in frame 156 with adhesive layer 12 of tape 10 of Figure l. Tacky surfaces 18 and 20 of layer 12 are bonded to pane 154 and frame 156 respectively thereby excluding _ 10 oxygen, whereafter exposure to curing radiation, for example, U.V. radiation passing through window 150 results in cure of surfaces 18 and 20 to provide a permanent bond.
With further reference to Figure 9, there is illustrated an assembly 96 for producing the tape 10 of Figure 1.

Assembly 96 includes a film delivery system 98, an adhesive delivery system 100, a conveyor 102, a curing system 104 and a supplementary curing system 108.
Delivery system 98 comprises rolls 110 and a bath~ roll 112 for delivering a continuous feed of support film 14 from a source (not shown).
Bath roll 112 is immersed in a bath 114 which suitably contains an oxygen-enriched silane-type primer which is applied to the support film 14. An oxygen line 116 provides a feed of oxygen to the primer in bath 114. The oxygen in the primer serves to inhibit the cure of the adhesive subsequently applied to the film 14.

- 4& - - I 33$1 89 Adhesive delivery system 100 comprises an extruder die 118 which delivers adhesive in flow-able form onto support film 14 as it is conveyed by conveyor 102.
Conveyor 102 comprises a pair of belt rolls 124 and a continuous belt 126 passing about the rolls 124. Support film 14 is supported on belt 126 during application of the adhesive fromextruder die 118, whereby an adhesive layer 12 is formed on film 14.
Curing system 104 includes upper and lower banks 120 and 122 of UV lights which direct UV
radiation to adhesive layer 12. A continuous belt 126 conveniently h`as an open surface or is in any event transparent to UV radiation so that such radiation from lower bank 122 may reach adhesive layer 112. For this purpose it is also appropriate that support film 14 be transparent to UV radiation.
Conveniently upper and lower banks 120, 122 are relatively long in length, particularly of the order of 10 metres and comprise low or medium intensity lamps. In this event it is appropriate to employ a supplementary curing system 108 which comp~ises high intensity upper and lower lamps 128 and 130 with upper and lower lenses 132 and 134 to direct the high intensity radiation.

_ 49 _ 133S189 Spray 136 is optional and applies a primer spray to the finished paper 10 before it is rolled on itself to form the roll 138.
With further reference to Fiture lOA, a window assembly 200 comprises spaced apart windows 202 and 204 with an insulating air space 206 therebetween.
The windows 202 and 204 are spaced apart by a spacer 208 which may comprise elongated aluminum members of rectangular cross-section. Spacer 208 is bonded to and between the opposed surfces of windows 202 and 204 by adhesive sealants 210 and 212 initially formed as coatings on opposed sides of spacer 208. The sealants 210 and 212 are derived from capped urethane-forming compositions. After assemling the windows 202 and 204 with the spacer 208 therebetween, coated with the sealants, the assembly 200 is heated to uncap the isocyanates of the composition which thereafter cure t form the sealants 210 and 212.
With further reference to Fig. lOB, a window assembly 220 comprises spaced apart windows 222 and 224 with an insulating air space 226 therebetween. The windows 222 and 224 are separated by a tape 228.
Tape 228 comprises a rubber strip 230 with a corrugated spacer strip 232 extending between opposed sides. Neoprene layers 234 are bonded to th~ opposed sides of the rubber strip 230.

After assembling the windows 222 and 224 with tape 228 therebetween, the assembly is heated to melt the surfaces of the neoprene layers 234 contacting the window surfaces, thereafter the neo-S prene layers 234 cool to provide a firm adhesive bond.
With further reference to Figure lOC, awindow assembly 240 comprises spaced apart windows 242 and 244 with an insulating space 246 there-between. The windows 242 and 244 are spaced apart by an extruded neoprene tape 248. The adhesive bond between the tape 248 and the windows 242 and 244 is produced in the same manner as described for the neo-prene layers 234 in Figure lOB.

The following Examples illustrate the invention in particular and preferred embodiments.
EXAMPLES
A) Materials : The following starting materials were used for the production of the reactive ingredients:
Polyether Diol was grade POLY-G2* of Olin Chemical Company, U.S.A. It has an average molecular weight of 775.
Polyether polyol was grade PLURACOL 220 obtained from Wyandotte Chemicals, U.S.A.
Aerosil was grade 130 from Degussa, Germany.
It has an average primary particle size of 16 nanometers.
- Isodecylacrylate was obtained from Sartomer Company, U.S.A.
Zinc di- and mono-acrylates were obtained from Sartomer Company, U.S.A. The materials are powders which pass through a 325 mech.
Glycidyl Methacrylate was obtained from Sartomer Company, U.S.A.

* trade mark ~2-(1-Aziridinyl) ethylmethacrylate was obtained from Aceto Chemical Company, Inc., U.S.A. The material has a purity of >92% by gas-liquid chromatography.
B) Preparation of Reactive Ingredients Poly (Alkylene Oxide) Diacrylate - This material waz prepared by treating a poly(propylene oxide) diol with toluene diisocyanate and subsequent reaction with hydroxypropyl acrylate.
To 537g of poly(propylene oxide)diol of average molecular weight of 775, was added 109g of toluene, 0.lg of benzoyl chloride and 250g of toluene diisocyanate. The solution was heated at 95-100C.
for a period of 3.5 hr. Then was added 191.2g of hydroxypropyl acrylate and the temperature was kept at 95-100C for another 2.5 hr. Finally, 0.114 cc.
of stannous octoate was added and heating continued for another 1 hr.
Poly (Alkylene Oxide) Triacrylate This material was prepared by treating poly (propylene oxide) triol with methylene-bis-cyclohexyl-isocyanate and subsequent reaction with hydroxypropyl acrylate.
To 1570g of poly(propylene oxide)triol (Wyandotte Pluracol 220*) of a hydroxy number of 26.88, * trade mark - 53 - ~335189 was added 0.5 ml of a 10% solution of tin dibutyllaurate in xylene at 70C. Then 211g of methylene-bis-cyclo-hexylisocyanate was added and the temperature increased to 95C. and kept there for approximately 3 hr. Then another quantity of catalyst was added (0.5 ml) and 104.7g of hydroxypropyl acrylate. The solution was then heated for 4 hr. at 95C. Then a third quantity of catalyst was added (0.3 ml), and after 2 hr. of heating, the solution was allowed to cool down. The product had a residual isocyanate content 9of 0.3%.
C) Acrylate Polymer Production Poly~butylacrylate - acrylic acid) la) A monomer solution of 588g butylacrylate, 130g of acrylic acid, 1.5g of laurylmercaptan and l.Og of ~ -methacryloxypropyl trimethoxysilane in 50 ml of xylene and a catalyst solution of 20g of lauryl-peroxide and 4g of t-butylperoxide in 50 ml of xylene were pre-pared. The polymerization was started with 50 ml of the monomer solution and 2 ml of the catalyst solution by adding to a resin kettle with stirring, with a nitrogen atmosphere and heating to 54C. After the induction period was over, the remaining solutions were added in equivalent proportions over 3 hrs. at a _ 54 _ 13~5 189 -reaction temperature of 120-135C. The resulting clear polymer was heated for another 3 hours at 100C. On cooling, a tough rubbery material, poly(butylacrylate-acrylic acid (84:16) was obtained.
lb) A polymer material was prepared in the manner of Example la) employing from 80g butylacrylate, 40g acrylic acid and 0.2g of laurylmercaptan in 10 ml of xylene as the monomer solution and 2g of laurylperoxide and 0.4g of t-butylperbenzoate in 10 ml. of xylene as the catalyst solution. The reaction conditions were as for Example la). The polymer material is a thermoplastic material poly(butylacrylate-acrylic acid (60:40).

Poly(ethylacrylate-acrylic acid-acrylonitrile) a) this polymer material was produced by adding to 320g xylene at 100C. the monomer solution and a catalyst solution over a period of 3 hours. The monomer solution contained 2.900g ethyl acrylate, 76g acrylonitrile, 76g acrylic acid and 3g laurylmercaptan.
The catalyst solution contained 26g laurylperoxide and 7g butylperbenzoate in 273g of xylene. The material was highly viscous with comonomer proportions of 95:2.5:2.5.

Poly(butylacrylate-ethylacrylate-acrylonitrile This polymer material was produced in the manner of Example 2, except that 1.450g of the ethyl-acrylate was replaced with 1.450g of butyl acrylate, to pro~uce a polymer of equivalent butyl acrylate and ethylacrylate proportions. Also, the monomer solution contained 1.5g of ~-methacryloxypropyl trimethoxy-silane. The material was highly viscous with comonomer proportions of 47.5:47.5:2.5:2.5.

Poly(butylacrylate-ethylacrylate-acrylic acid) Into a reaction vessel was added a solution of 72.6g of ethylacrylate, 93g of butylacrylate, 3.8g of acrylic acid, 5g of azo-bis-isobutylronitrile and 0.68g of lauryl mercapan. Initially, lOg were added and the solution was heated up until the induction period had passed. The main portion was then added at a rate so that the internal temperature remained between 125-130C. The addition was carried out over a period of one hour, after which time the polymer material could be stirred easily. The polymer material remains a clear but viscous liquid at 25C, with comonomer proportions of 54.5:43.1:2.4.

Poly(butylacrylate-ethylacrylate-acrylic acid Polymerization was initiated with a solution of 21.7g of ethyl acrylate, 50g of butyl acrylate, 3g of acrylic acid, 2g of azo-bis-isobutyronitrile and 0.2g of lauryl mercaptan in a reactor by slow heating, starting at 25C. The polymerization started vigorously at 55C. The main part of the poly-merization was carried out between 100 and 120C. by a slow addition of 250g of the same monomer mixture over a period of two hours with external waterbath cooling.
Since stirring becomes difficult at this stage, the material was removed from the reactor and heated for two additional hours at 120C. The polymer material was highly viscous with comonomer proportions of 67:28:5.

Poly(butylacrylate-ethylacrylate-acrylic acid A starting solution of 45g of ethylacrylate, 45g of butylacrylate, 5g of acrylic acid, 0.5g of azo-bis-isobutyronitrile and 0.35g of lauryl mercaptan was added in 5 portions to a stirred reaction kettle at a kettle temperature of 70C. Each portion was only added after an exotherm had indicated that the previous portion had reacted. The reaction was continued - 57 ~ 133S189 over a period of three hours at a temperature between 80 and 105C. with a solution of 442g of ethylacrylate, 442g of butylacrylate, 44g of acrylic acid, 50g of azo-bis-isobutyronitrile and 6.lg of lauryl mercaptan.
Because of the high viscosity of the product, stirring in the:reaction vessel becomes difficult. The poly-mer material was removed from the reactor and heated without stirring for 2 hours at 120C. The polymer material was rubbery with comonomer proportions of 47.6:47.6:4.8.

Poly(butylacrylate-ethylacrylate-acrylic acid) To 1713g of a monomer mixture consisting of 54.3% of butylacrylate, 42.3% of ethylacrylate and 3.4% of acrylic acid was added 40g ~2.5%) of azo-bis-isobutyronitrile and 6.8g (0.4%) of lauryl mercaptane at 22C. The solution was cooled to 10C. and added dropwise to a stirred and heated reaction vessel with a wall temperature of approximately 70C.
The reaction started immediately. The addition was continued and the reaction vessel cooled at such a rate that the internal temperature remained between 105 and 135C. Near the end of the addition, the stirring of the polymer becomes very difficult with a single-blade stirrer because of a strong Weissenberg effect. The addition was complete after 3 hours. The polymer was then heated for another 3 hours at 80-100C. The resulting polymer was a highly viscous material with comonomer proportions of 54:3:42:3:3.4.

_ A solution was prepared consisting of 865g butylacrylate, 535g ethylacrylate, 38g acrylonitrile, 76g of ~ -carboxyethylacrylate and 1.5g dodecylmer-captan.
A second solution was prepared containing 3.5g t-butyl peroxide, 13.5g laurylperoxide and 137ml mineral spirits. A stirred resin kettle contained 160ml of mineral spirits and was heated to 100C. The monomer and initator solutions were added dropwise at equivalent proportions over a period of 3 hours at a reaction temperature of 95-125C. with constant stirring, and some coollng in a water bath. The polymer was allowed to cool down.
GLC analysis shows the following residual monomer concentration:
Butylacrylate = 0, ethylacrylate = 0.5%, acrylonitrile = 0.03%, ~-carboxyethylacrylate - 0.1%.

- s9 -- A solution of 1700 g butylacrylate, 240 g ethylacrylate, 60 g acrylic acid and 4 g dodecyl-mercaptan was added dropwise to a pre-heated reactor ( ~100C. wall temperature). The reactor was stirred with a single-shaft glass stirrer equipped with a Teflon* blade. At the same time was added 80 g of Lupersol* 531-80M, dropwise at a rate that both monomer and peroxide were always added in the same proportions over the total addition period of 3.5 hours. After the initial addition of approximately 25 ml the reactor vessel was cooled so that the reaction temperature remained between 95 and 110C. After 200 ml of monomer addition, 30 ml of toluene was added to improve stirring. Another 30 ml were added after a total of 450 ml monomer, and another 70 ml after 600 ml of monomers. The clear polymer was heated at 70C. for six hours.

A four-necked flask, equipped with thermo-meter, heavy-duty single-shaft glass stirrer contain-ing a Teflon* blade, thermometer, dropping funnels for monomers and initiator solution, and containing 50 g of toluene was heated to cause refluxing of the toluene. The monomer mixture consisted of 1700 g trade mark butylacrylate, 240 g ethylacrylate, 60 g acrylic acid and 6 g of dodecylmercaptan. The initiator solution contained 54 g of lauryl peroxide and 14 g t-butylper-benzoate in 150 ml toluene. Over a period of 3 hours the two solutions were added at the equivalent rate into the reactor vessel under stirring and cooling to maintain the reaction between 85 and 110C. The polymer could easily be stirred. It was heated over night at 70C. and then had a viscosity of 23,600 cps at 70C. (Brookfield, Spindle #3). After 4 hours at 200F. under vacuum in the Baker/Perkin mixer the solids level was 99.5%. The viscosity at 29C. was 2.5 x l0 cps and at 70C. 0.12 x 106 cps.

~ trade mark D. Adhesive Compositions Surface Treatment of a Compounded Rubber with a Photo-Curable Formulation A coating of the photo-curable formulation A, in Table I below, of about 0.5 mm thickness was applied to both sides of a strip of compounded rubber.
The rubber formulation consisted of 16% butyl rubber, 26% hydrocarbon resins, 21% plasticizer and 37%
carbon black and inorganic fillers. The strip was placed between glass plates and both sides of the glass were exposed to low-intensity ultra-violet light of an intensity of 1200 ~uW/cm2. The use of the photo-curable formulation prevented adhesive failure when the glass plates were removed under force or on impact at -34C.

Preparation of a Photo-Cured Adhesive Material in Low-Intensity Ultra-Violet Light A 0.3 mm thick layer of the photo-curable formulation A, in Table I below, was cast on a sheet of silicone-treated release paper and exposed to low intensity ultra-violet light of an intensity of 1200 ~W/cm2. After 30 min. exposure the material was cured but both the upper and lower surfaces remained tacky.

- ~2 - 1335 189 The material had a SHORE A hardness of 40, an elongation at break of 150%, a tear strength of 7.7 lb/in, and a tensile strength of 42 lb/in. The sample remained flexible at -42C. and showed good adhesion to glass after attaching glass plates to the upper and lower surface of the material and exposing the system to sun light for 60 minutes at 25C.

Preparation of Photo-Cured Adhesive Material in High-Intensity Ultra-Violet Light.
The photo-curable formulation B, in Table I below, was extruded in strips of 1.5 cm width and 3mm thickness onto silicone-treated release paper.
The strips were passed under a medium-pressure Hanovia*
652-OA 431 UV lamp of an intensity of 200 W/square inch at a speed of 27 feet per minute. This corresponded to an exposure time of the focussed light beam of 0.5 seconds. The cured strip can be transferred to glass or other solid surfaces so that it is attached to one or two such surfaces. After exposing the system to low-intensity UV light sources, including sun light, the material bonds to the glass interface.

*` trade mark - 63 - 13~5189 The material remained flexible and tacky at -32C., but became brittle at -35C. The material showed cohesive failure on anodized aluminum at -36C.
in a peel test.

EXAMPLE ~4 The polymer of formulation C, in Table I
below, was prepared by mechanically stirring 23.7% of zinc diacrylate into 475g of the polymer of Example 7 and then heating at 70C. for 5 hours with occasional mixing and deaeration after 5 hours and 30 minutes.
The resulting polymer had very low tack, was not gelled, but was opaque.
To the polymer was then added 42.7g poly-(alkylene oxide) triacrylate (9 pph) described above and 2.4g (0.5 pph) Irgacure* 184. The material was mixed at 70C. and then deaerated which caused con-siderable frothing. The material had very little tack, was not gelled, had little flow, and adhered sufficiently to release paper.
Tests show that excellent adhesion to glass developed on exposure of the material to "Black Light".

* trade mark Preparation of Photo-Cured Adhesive Material in High-Intensity Ultra-Violet Light for Adhesion to Glass and Metals.
The photo-curable material of formulation C, in Table I below, was cast into a sheet of 2mm thick-ness onto release paper. The sheet was cured by six passes underneath a HANOVIA* light source of an intensity of 200 W/square inch at a speed of 27 feet/min. This corresponds to an exposure time of 3 seconds to the focussed light beam. The material showed a SHORE A hardness of 35 and an elongation of 150%. The cured material has sufficient tack on both the upper and the lower surface to adhere very well to solid surface. The material was cut into 1 cm wide strips and placed between the followinq surfaces:
glass and milled aluminum glass and anodized aluminum glass and glass.
After exposing the glass side to sun light for one hour behind double-glazed windows, excellent adhesion was obtained to all the interfaces, as evidenced by the cohesive failures when the glass or metal sur-faces were removed.

* trade mark A sheet 8" widé and 3/16" thick and 12"
long was allowed to flow slowly into release paper at 40C. and is then exposed to a Hanovia*
lamp of a focus width of 1", at a travelling speed of 4feet per minute. The cured sheet was approximately 35C. ~arm and could easily be removed from the release paper on cooling to 25C.
The polymer had the following properties:

After "Black Light"
10 Dumbell Initial Polymer Exposure Elongation 350, 500% 300%
Tear Strength 16.7; 16.0 pli 55, 50 pli Tensile Strength 132, 126 psi 175, 180 psi Colour Colourless Pale Yellow Hardness 3.5-40 35-40 Flexibility at -32C. Partially Partially * trade mark After Black Light Initial Polymer Exposure Elongation 350,500% 125%
Adhesion 97 psi Lap Shear Glass/Glass 26 psi* 131 psi Glass/Anodized Aluminum 36 psi* 126 psi NOTE:
* Adhesive failure; surface remains tacky and and can be re-adhered.

Preparation of Photo-Cured Adhesive Material in High Intensity Ultra-Violet Light for Adhesion to Glass and Metals The photo-curable material of formulation C in Table 1 was cast at about 60C into a H-bead in accordance with ASTM C 719-79 and photo cured by exposure to sunlight and tested for elongation and adhesion.
The photocured material displayed the same properties as in Example 19.

-To the polymer of Example 3 was added 2.1%
zinc diacrylate at 120C. with stirring and sub-sequent heating at 120C. for 30 minutes. Vacuum was applied to deaerate the material. Then 15% of poly(alkyleneoxide)triacrylate and 0.25% of Irgacure**
184 was added with stirring at ~0C.
The material was then spread on release paper to a thickness of 4 mm. The material had very little flow at ambient temperature, adhered very well to milled aluminum and glass, and could be removed from release paper and cut.

The material was then exposed to a Hanovia**
lamp of a focus width of 1" at a travelling speed of 4 feet per minute.

** trade mark To the poly(butylacrylate-ethylacrylate-acrylonitrile) of Example 3 was added 2.1% zinc di-acrylate at 120C. with stirring and subsequent heat-ing at 120C. for 30 minutes. Vacuum was applied to deaerate the material. Then 15% of PA0-TA and 0.25%
of Irgacure 184 were added with stirring at 80C.
The material was then spread on release paper to a thickness of 4 mm. The material had very little flow at ambient temperature, adhered very well to milled aluminum and glass, and could be removed from release paper and cut.
The material was then exposed to a Hanovia* lamp of a focus width of 1" at a travelling speed of 4 feet per minute.
The material showed a lap shear strength of 86 p.s.i. between glass plates after the glass plates had been exposed to sunlight for three days.
Lap shear specimen were exposed to 1000 hour Q-UV exposure at 60C. (8 hours UV light and 4 hours condensation cycle) and then showed an average lap shear value of 59 psi.

* trade mark Photo-Curing and Physical Properties of Polymer of Example 3 A sample of formulation D, in Table I below, was spread out on silicone treated paper (release paper) to a thickness of 1/8 of an inch and photo-cured under Black Light for 3 to 15 minutes, respectively.
The test materials showed elongation at failure values of 500%. The lap shear values between glass were in the range of 71-75 p.s.i. after exposure to sunlight for 3 days.
A sample of formulation D, in Table I below, was spread out on silicone treated paper (release paper) to a thickness of 1/8 of an inch and photo-cured under a Hanovia* UV lamp and then placed between glass, exposed to sunlight for 3 days. The resulting lap shear strength was 45 to 51 p.s.i., respectively.

* trade mark Photo-Curing and Physical Properties of Polymer of Example 10 Formulation E, in Table I below, was prepared by mixing the polymer with zinc monometh-acrylate and heating at 70C. for 2 hours. The other ingredients were mixed under high shear mixing (Haake-Buchler Torque Rheometer) and then extruded in sheets of 3/16 inch thickness and exposed to Black Light of 120 ~tcm intensity for 3 minutes. The mate-rial then showed 200% elongation at failure. Samples placed between glass and exposed to sun for 3 days developed lap shear strength of 97 p.s.i.

When the zinc monomethacrylate in Example 21 was replaced with zinc dimethacrylate, the pre-cured polymer also showed an elongation of failure of 200% and, after exposure of a glass lap shear specimen to sun for 3 days, a lap shear value of 86 p.s.i.

Photo-Curing and Physical Properties of Polymer of Example 10 Formulation E, in Table I below, was prepared by mixing the polymer with zinc monometh-acryla.te and heating at 70C. for 2 hours. The other ingredients were mixed under high shear mixing (Haake-Buchler Torque Rheometer) and then extruded in sheets of 3/16 inch thickness and exposed to Black Light of 120 ~/cm intensity for 3 minutes. The mate-rial then showed 200% elongation at failure. Samples placed between glass and exposed to sun for 3 days developed lap shear strength of 97 p.s.i.

When the zinc monomethacrylate in Example 21 was replaced with zinc dimethacrylate, the pre-cured polymer also showed an elongation of failure of 200% and, after exposure of a glass lap shear specimen to sun for 3 days, a lap shear value of 86 ~ p.s.i.

TABLE

A B C D E
Polymer (Ex. 3) lO0 Polymer (Ex. 7) - lO0 lO0 Polymer (Ex. 9) - - - lO0 Polymer (Ex. 10) - - - _ 100 ZMA _ _ _ _ 5 IDA 20 7.9 PA0-TA 41 20.6 9 10 10 PA0-DA - 20.6 AAD 5 8.4 Irgacure-184* 0.5 0.5 0.5 0.5 0.5 * trade mark ZDA = zinc diacrylate ZMA = zinc monomethylacrylate IDA - isodecylacrylate PA0-TA = poly(alkylene oxide) triacrylate PA0-DA - poly(alkylene oxide)diacrylate 20 AAD = /~-carboxyethylacrylate (i.e., acrylic acid dimer) ~ 73 ~ l 3351 89 - TABLE

A B C D E
Polymer (Ex. 3)lO0 - - - -Polymer (Ex. 7) - lO0 lO0 Polymer (Ex. 9) - - - lO0 Polymer (Ex. 10) - - - - 100 IDA 20 7.9 PA0-TA 41 20.6 9 10 10 PA0-DA - 20.6 - - -AAD 5 8.4 Irgacure-184* 0.5 0.5 0.5 0.5 0.5 * trade mark ZDA = zinc diacrylate ZMA = zinc monomethylacrylate IDA = isodecylacrylate PA0-TA = poly(alkylene oxide) triacrylate PA0-DA = poly(alkylene oxide)diacrylate 20 AAD - ~-carboxyethylacrylate (i.e., acrylic acid dimer) 133~189 Photo-initiated cross-linking of adhesive formulations is restricted to materials which are optically clear. However, formulations which con-tain inorganic fillers, and are thus less expensive, can be cross-linked by thermal initiation, for example, such as direct heat or microwaves.
Acrylate formulations have been developed, which can be cured thermally and remain tacky so that the partially cured material can be used as adhesive tape and sheet. The surface tackiness is due to air inhibition of the acrylate polymerization.

Thermal Cure:
A polymer was prepared from 85 parts butyl acrylate, 12 parts ethyl acrylate and 3 parts acrylic acid in 6 parts toluene. The initiator was Luper-sol 531-80M (trade mark of Pennwalt/Lucidol Corp., U.S.A.), (4 parts) and the chain transfer agent was dodecylmercaptan (0.2 parts), (Polymer of Example 9).
The solvent was removed from the formulation and the viscous material was treated with 5 parts zinc diacrylate, followed by the addition of 10 parts of a triacrylate, prepared from a polyether polyol (Pluracol 200, trade mark of Wyandotte, U.S.A.), ~ 75 ~ 1335189 methylene-bis-cyclohexylisocyanate and hydroxylpropyl acrylate. Furthermore, 0.5 parts of an initiator Irgacure 184 ttrademark of Ciba-Geigy), was added.
The material was sheeted out and heated at 112C. for 15 minutes, after which the material still showed some flow at 25C., but remained tacky.
A lap shear specimen between glass after 2 hours exposure to sun showed a value of 99 p.s.i. When the thermal cure was extended to 30, 45 and 60 min.
respectively, the lap shear values after exposure to sun were 84, 118 and 48 p.s.i., respectively.

Microwave Cure:
A sample of the formulation of Example 22 was sheeted out to a 4" x 4" x 1/8" sheet and exposed for 1 min. to full power in a conventional home microwave oven. The sample had heated up and cured, maintaining tacky surfaces at room temperature.
A lap shear test between glass, after exposing one of the glass/polymer interfaces to sun for 3 hours showed a lap shear strength of 41 p.s.i.

Plastisol Command Cure Ingredients Parts by Weight Vinyl Resin, Geon 121 100 Plasticizer, Di-Octyl Phthalate 85 Calcium carbonate, Atomite 100 Carbon Black N650 Silane Prosil 221 1.5 Geon 121 - trade mark of The B. F. Goodrich Company.
Atomite - trade mark of Thompson-Weiman Co.
N650 - Columbian Chemical Co.
Prosil 221 - trade mark of SCM Corp.
A plastisol was formed by mixing the vinyl resin and di-octyl phthalate plasticizer for 15 minutes at medium speed in a caulk mixer to form a dispersion.
The calcium carbonate reinforcement pigment was added followed by mixing for a further 10 minutes at medium speed, whereafter the carbon black was mixed in until dispersed.
The silane for promoting adhesive properties was added with mixing for five minutes.
The resulting plastisol composition was applied as a sealant between two lites of glass and the resulting assembly was heated to 325F for 15 minutes. The plastisol composition formed an elasto-meric rubber-like bonding sealant between the lites.

133518~

Photo-Curable Sealant/Adhesives A commercially available U.V. adhesive was applied to cured EPDM and neoprene spacer strips as manufactured by Tremco. The adhesive used was "light.-weld 625" manufactured by American Chemical and Engineering Co.
The coating was permitted to dry at ambient conditions for 24 hours. An insulating glass assembly was then made with the coated spacer inserted between two pieces of 3/16 inch glass. A cure was then obtained by exposing the bond line to ultra violet - light as generated by a General Electric RS-l lamp.
A firm sealing bond was produced in a period of seconds.

Anaerobic Command Cure A commercially available anaerobic adhesive was applied to cured EPDM and neoprene spacer strips as manufactured by Tremco. The adhesive used was "Speed Bonder Structural Adhesive" manufactured by Loctite Corporation.

' -An insulating glass assembly was formed of two lites of glass with the coated spacer bar there-between. The glass lites were pressed together to exclude oxygen whereby the adhesive was curved to 5 form a firm sealing bond between the glass lites.

Butyl-Chlorobutyl Command Cure Ingredients Parts by Weight Chlorobutyl, HT 1066 500 Carbon Black, Statex R 250 Phenolic Resin SP 1055 25 Polybutene, H-300 500 ZnO powder 15 Silane, Prosil 221 12.5 HT1066 - Exxon Corp.
Statex* R - Columbian Chemical Corp.
SP 1055 - Schenectady Chemicals, Inc.
H-300 - Amoco Corp.
ZnO (Zinc Oxide) - Whittaker, Clark and Daniels Co.
Prosil* 221 - SCM Corp.

* trademark The chlorobutyl rubber, carbon black and phenol resin were mixed for 30 minutes in a Sigma mixer to a temperature of 180F. The polybutene and zinc oxide powder were added to the mixture and the mixing continued for 15 minutes bringing the mixture to a témperature of 160F. The silane was added and the mixing was continued for 5 minutes.
The resulting material was cooled to room temperature and then extruded into a pre-formed tape having a cross-sectional dimension of 1/4 inch by 3/16 inch.
An insulated glass assembly was then made inserting the tape between two pieces of 3/16 inch glass with the 3/16 inch sides in contact with the glass.
The assembly was then baked at 275F for 20 minutes to effect a cure.
The glass assembly was held firmly together by the tape.

Blocked Urethane Command Cure IngredientsParts by Weight Blocked Poly BD
(toluene diisocyanate blocked with nonyl-phenol) 15 Plasticizer, Santocizer* 261 7.5 Ca CO3, Atomite 15 Carbon Black, Statex* R 1.5 Accelerator, Quadrol*
Dibutyl-tin-dilaurate (DBTDL) 0.15 Accelerator DMP-30 0.15 Silane, A187 0.3 Poly BD R-45 - Acro Chemical Santocizer* 261 - Monsanto Chemical Atomite* - Thompson-Weiman Co.
Statex* R - Columbian Chemical Co.
20 Quadrol* - Wyandotte DBTDL - Cosan Chemical Co.
DMP-30 - Rohm & Haas A187 - Dow Corning * trade mark The toluene diisocyanate blocked with nonyl-phenol was mixed with the plasticizer for ten minutes in a caulking mixer; the calcium carbonate and carbon black were added and mixing was continued for 30 S minutes to form a smooth blend. The two accelerators and the dibutyl-tin-dilaurate (DBTDL) were added and mixing continued for 10 minutes, whereafter the silane was added with mixing for a further 5 minutes.
The resulting blend was pumped into the space defined by two lites of glass and a conventional aluminum spacer bar. The resulting assembly was baked at 290F for 20 minutes during which time the heat sensitive phenol is split off from the toluene-diisocyanate allowing the latter to cure to a urethane polymer firmly bonding and sealing the assembly.
The blocked toluene diisocyanate was formed as follows:
Poly DB R-45HT Equiv. Wt. = 1203.9 Nonyl Phenol Equiv. Wt. = 220 TDI Equiv. Wt. = 87 Reagent Amount R-45HT 301 gms.
TDI 45.7 gm (5% excess) NP 60 gms (55+5 to absorb excess TDI) Benzoyl chloride 0.3 gms (0.1%) Procedure 1. Add R-45HT and benzoyl chloride to a reactor and stir together under N2 at room temperature for 30 minutes.

2. Add TDI and continue stirring under N2 without heating (An exotherm was observed to increase the temperature to 37C from 25C.).

3. After reacting for 22 hrs., % NCO was 3.5141%
which corresponds to conversion of 93.9% of the polyol. (44.7% of NCO consumed).

4. The reaction was run another 30 minutes and then the nonyl phenol was added. An exotherm to 34C was observed.

5. After sitting overnight %NCO was 2.7086% = 50%
lS consumed.

6. Heating to 90C for 2 hours (including heat-up time) gave %NCO = 2.5410% = 53.1% NCO consumed.

7. The reaction mix was allowed to cool to 50C and 5 drops of stannous octoate were added. The reaction mix was allowed to cool to ambient temperature after stirring in the catalyst, and the reactor stoppered.

-8. The %NCO was determined as %NCO =
1.6285% = 70%.

9. 5 more drops of stannous octoate were added and the mixture was heated to 90C until %NCO =
0.58205% = 89.3% con.

10. After sitting overnight at room temperature, the reaction mix was heated to 90C ~%NCO =
0.25584% = 95.3% consumed). Then 5 more drops of stannous octoate were added. Heating was continued for 90 minutes NC0% = 0.17880% =
96.7% consumed.

11. The polymer was transferred hot, 370 gms eq. wt.
(calculated) = 1478 gms viscosity = 3,400 Kcps.

Epoxy Command Cure Ingredients Parts by Weight Epoxy Resin, EPON* 828 100 Dicyandiamide Powder 10 CaCO3 (Atomite*) EPON* 828 - Shell Chemical Corp.
Dicyandiamide - American Cyanamide Corp.
Atomite* - Thompson-Weinman Co.
The epoxy resin and dicyandiamide powder were mixed for 10 minutes in a caulk mixer to form a dispersion. The calcium carbonate was added and mix-inv continued for 15 minutes until the carbonate was dispersed. The resulting sealant composition was shelf stable and was pumped into the space defined by two lites of glass and an aluminum spacer bar. The assembly was heated at 350F for 15 minutes to effect cure of the sealant to firmly seal and bond the assembly.

* trade mark ~ - 85 -1335189 Neoprene Command Cure Ingredients Parts by Weight Neoprene, AC-S 600 Chlorobutyl, HT 1066 100 Magnesium Oxide Maglite* D 30 Anti-oxidant, 2246 18 Stearic Acid 30 Phenolic Resin, Super Beckacite* 426 Clay, Dixie 561 Carbon Black Statex* R 30 Plasticizer Santocizer* 268 168 Molecular Sieve Powder, 4A 66 Molecular Sieve Powder, 10A 66 Silane, A-1120 The neoprene, chlorobutyl and magnesium oxide were mixed for 15 minutes in a Sigma blade mixer until the ingredients were broken down and knitted together. The antioxidant and stearic acid were added and mixed in until dispersed. The phenolic resin was added and mixing continued to form a smooth blend, whereafter the clay and carbon black were added slowly with mixing so as not to break the knit and to form a smooth blend. The plasticizer and the molecular sieves were mixed in until dispersed while * trade mark maintaining the temperature below 250F and finally the silane was added followed by mixing for 5 minutes.
The bulk composition was cooled to ambient temperature and extruded to a pre-formed tape with a $ cross-sectional dimension of 3/16 inch by 1/4 inch.
The tape was used as a spacer between two lites of glass and the resulting glass assembly was passed through an infrared oven in which it was heated to a temperature of 165F. The assembly was passed between a series of compression rollers to firmly press the tape into contact with the lites. The assembly was allowed to cool to ambient temperature and over a period of 15 to 20 minutes the tape formed an elastomeric bond to hold the lites.

The command cure systems of the invention achieve a number of desirable benefits by applying the sealant at one time but delaying the curing until it is desirable having regard to such factors as:
S a) economical scheduling of the work force, b) complete curing of the sealant without being dependent on ambient conditions of temperature and humidity, c) freedom to package and ship the finished insulat-ing glass unit at a controlled time.
In this specification the expression"window glass" is intended to embrace all clear lites including conventional glass and plastic, for example, acrylate lites.

Claims (25)

1. An adhesive polymer strip comprising:
a shaped body and at least one exposed surface portion, said strip being transparent to curing ultraviolet light radiation in the range from 250 to 450 nm, and comprising an essentially solvent-free adhesive polymer having a viscosity of at least 50,000 cps measured at 25°C, and curable in the presence of said radiation, the curing being inhibited by oxygen, said adhesive polymer being cured throughout said body portion and uncured at said at least one exposed surface portion, such that said at least one surface portion remains tacky.

2. The strip according to claim 1, wherein said polymer includes an acrylate monomer and said strip has a thickness in the range from 0.16 to 1.27 cm (0.0625 to 0.5 inch).

3. The strip according to claim 2, wherein said polymer has plural pendent side chains having photo-polymerizable terminal vinyl groups.

4. The strip according to claim 3, wherein said vinyl groups are introduced into said acrylate polymer via a modifying reagent which is a metal or triacrylate or a metal hydroxy acrylate of formula (I):
(HO)mMeXAn (I) in which Me is a metal, A represents an acrylate radical, x is an integer of at least 2, n and m are both integers of at least 1 and n + m = x.

5. The strip according to claim 4, wherein said terminal vinyl groups are acrylate groups and said composition further comprises a cross-linking agent comprising a di- or polyfunctional acrylate.

6. The strip according to claim 5, wherein said acrylate polymer is derived from polymerization of at least one acrylate monomer selected from ethyl acrylate, butyl acrylate, 2-ethyl-hexyl acrylate, .beta.-carboxyethyl arylate with hydroxypropyl arylate or acrylic acid.

7. The strip according to claim 6, wherein said at least one acrylate monomer is copolymerized with said acrylic acid and acrylonitrile.

8. The strip according to claim 2 comprising a blend of said polymer and a mastic rubber composition.

9. A flexible, preformed adhesive strip comprising:
a flexible substrate and an adhesive layer supported on said substrate, said adhesive layer having a shaped body portion and a first outer surface portion remote from said substrate, said adhesive layer being transparent to curing radiation and having a thickness of up to twice its transparent depth and comprising an essentially solvent-free adhesive polymer composition, being substantially cured throughout said body portion and uncured at said first outer surface portion, such that said first outer surface portion remains tacky, said adhesive polymer composition comprising a flowable acrylate polymer with a plurality of pendant side chains containing terminal vinyl groups and a cross-linking agent for said polymer, and being curable by UV-radiation in the range from 250 to 450 nm, only while being exposed to said curing radiation to produce a cured composition and having a transparent depth up to 2.54 cm (1 inch), the curing of said adhesive polymer composition by said radiation being inhibited by oxygen.

10. The strip according to claim 9, further including a second flexible substrate in adhering contact relationship with said outer surface portion, with a tack such that said second substrate is readily removable from said adhesive layer.

11. The strip according to claim 9 wherein the terminal vinyl groups are introduced into the acrylate polymer via a modifying reagent which is a metal or triacrylate or a metal hydroxy acrylate of formula (I):
(HO)mMexAn (I) in which Me is a metal, A represents an acrylate radical, x is an integer of at least 2, n and m are both integers of at least 1 and n + m = x.

12. The strip according to claim 11, wherein said terminal vinyl groups are acrylate groups and said composition further comprises a cross-linking agent comprising a di- or polyfunctional acrylate.

13. The strip according to claim 11, wherein said adhesive polymer is an acrylate polymer derived from polymerization of at least one acrylate monomer selected from ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, .beta.-carboxyethyl acrylate with hydroxypropyl acrylate or acrylic acid.

14. The strip according to claim 13, wherein said at least one acrylate monomer is copolymerized with said acrylic acid and acrylonitrile.

15. The strip according to claim 9, wherein said adhesive layer comprises a second outer surface portion in adhering contact relationship with said substrate.

16. The strip according to claim 15, wherein said second outer surface portion is an uncured tacky portion with a tack such that said substrate is readily removable from said adhesive layer.

17. The strip according to claim 9, 10, 11, 12, 13, 14, 15 or 16, wherein said adhesive layer has a thick-ness of 0.16 to 1.27 cm (0.0625 to 0.5 inch).

18. A flexible substrate and an adhesive layer sup-ported on said substrate, said adhesive layer having a shaped body portion and a first outer surface portion remote from said substrate, said adhesive layer being transparent to curing radiation and having a thickness of up to twice its transparent depth and comprising an essentially solvent-free adhesive polymer composition, being sub-stantially cured throughout said body portion and un-cured at said first outer surface portion, such that said first outer surface portion remains tacky, said adhesive polymer composition comprising a flowable acrylate polymer with a plurality of pendant side chains containing terminal vinyl groups and a cross-linking agent for said polymer, and being curable by UV-radiation in the range from 250 to 450 nm, only while being exposed to said curing radiation to produce a cured composition and having a transparent depth up to 2.54 cm (1 inch), the curing of said adhesive polymer composition by said radiation being inhibited by oxygen.

19. The flexible substrate and adhesive layer supported thereon, according to claim 18, are together windable to form a roll or coil wherein said substrate has an outer release surface in non-adhering contact with said layer.

20. The flexible substrate and adhesive layer supported thereon, according to claim 19, wherein said vinyl groups are introduced into said acrylate polymer via a modifying reagent which is a metal or triacrylate or a metal hydroxy acrylate of formula (I):
(HO)mMexAn (I) in which Me is a metal, A represents an acrylate radical, x is an integer of at least 2, n and m are both integers of at least 1 and n + m = x.

21. The flexible substrate and adhesive layer supported thereon, according to claim 20, wherein said terminal vinyl groups are acrylate groups and said composition further comprises a cross-linking agent comprising a di- or polyfunctional acrylate.

22. The strip according to claim 21, wherein said acrylate polymer is derived from polymerization of at least one acrylate monomer selected from the group consisting of ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and .beta.-carboxyethyl acrylate with hydroxypropyl acrylate or acrylic acid.

23. The strip according to claim 22, wherein said at least one acrylate monomer is copolymerized with said acrylic acid and acrylonitrile.

24. A laminate comprising:
first and second self-supporting layers in opposed facing relationship and an adhesive layer therebetween;
said adhesive layer having a pre-shaped body portion and opposed first and second outer surface portions, said outer surface portions being in contacting relationship with said first and second layers respectively, said adhesive layer being transparent to curing radiation and having a thickness of up to twice its transparent depth and comprising an essentially solvent-free adhesive polymer having a viscosity of at least 50,000 cps measured at 25°C, and curable in the presence of said radiation, the curing being inhibited by oxygen, said polymer being cured throughout.

25. The laminate according to claim 24, wherein said adhesive composition is a flowable polymer composition and said thickness is in the range from 0.16 to 1.27 cm (0.0625 to 0.5 inch).