CA1340135C - Silyl 2-amidoacetate and silyl 3-amidopropionate compositions - Google Patents
Silyl 2-amidoacetate and silyl 3-amidopropionate compositionsInfo
- Publication number
- CA1340135C CA1340135C CA000591515A CA591515A CA1340135C CA 1340135 C CA1340135 C CA 1340135C CA 000591515 A CA000591515 A CA 000591515A CA 591515 A CA591515 A CA 591515A CA 1340135 C CA1340135 C CA 1340135C
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- Prior art keywords
- optical fiber
- compound
- azlactone
- fiber according
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/38—Polysiloxanes modified by chemical after-treatment
- C08G77/382—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon
- C08G77/388—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/105—Organic claddings
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic System
- C07F7/02—Silicon compounds
- C07F7/08—Compounds having one or more C—Si linkages
- C07F7/18—Compounds having one or more C—Si linkages as well as one or more C—O—Si linkages
- C07F7/1896—Compounds having one or more Si-O-acyl linkages
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/045—Light guides
-
- G02B1/105—
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/111—Anti-reflection coatings using layers comprising organic materials
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
Abstract
The present invention provides novel silyl 2-amidoacetates and silyl 3-amidopropionates which are the reaction products of azlactone and silanol reactants. The novel products result from nucleophilic addition of a soluble or insoluble, low or high molecular weight reactant containing one or more silanol groups and a soluble or insoluble, low or high molecular weight reactant containing one or more azlactone groups. The reaction products provide for high adhesion between the siliceous and azlactone reactants, as would be useful as protective coatings particularly on silicon-containing materials. It has been recognized in the present invention that silyl 2-amidoacetates and silyl 3-amidopropionates are useful linkages between silanol and azlactone derived materials.
Description
134013.~
Field of the Invention This invention relates to silyl 2-amidoacetate and silyl 3-amidopropionate compositions that result from the reaction of azlactones and silanols. These reaction products provide for excellent adhesion in the form of covalent bonding to silicon based surfaces, polymers, and compounds. The reaction products find use as protective coatings particularly on silicon-containing materials. They are especially useful as a means of providing well-adhering claddings to siliceous cores for light transmission in a fiber optics construction.
Backqround of the Invention The development of fibers which are capable of transmitting light over long distances with relatively low losses began in the mid-to-late 1960's. What has evolved are fiber optics constructions which consist of at least two and generally three components, namely a core, a cladding, and optionally, a protective coating for the cladded core. The core, which actually performs the light transmitting function, is generally either siliceous glass or an amorphous organic polymer and is physically located at the center of the construction. In order to avoid excessive losses of light in a transverse direction, the core must be coated or "clad" with ~~r 1~013~
la a material that possesses a refractive index lower than that of the core. This cladding material can be an organic polymer, and because of their relatively low refractive indices, fluorinated polymers and polysiloxanes have emerged as ,:~
-
Field of the Invention This invention relates to silyl 2-amidoacetate and silyl 3-amidopropionate compositions that result from the reaction of azlactones and silanols. These reaction products provide for excellent adhesion in the form of covalent bonding to silicon based surfaces, polymers, and compounds. The reaction products find use as protective coatings particularly on silicon-containing materials. They are especially useful as a means of providing well-adhering claddings to siliceous cores for light transmission in a fiber optics construction.
Backqround of the Invention The development of fibers which are capable of transmitting light over long distances with relatively low losses began in the mid-to-late 1960's. What has evolved are fiber optics constructions which consist of at least two and generally three components, namely a core, a cladding, and optionally, a protective coating for the cladded core. The core, which actually performs the light transmitting function, is generally either siliceous glass or an amorphous organic polymer and is physically located at the center of the construction. In order to avoid excessive losses of light in a transverse direction, the core must be coated or "clad" with ~~r 1~013~
la a material that possesses a refractive index lower than that of the core. This cladding material can be an organic polymer, and because of their relatively low refractive indices, fluorinated polymers and polysiloxanes have emerged as ,:~
-
-2- 134013~
impo-rtant cladding materials. In addition to proper light handling characteristics, other desirable feature# of polymeric claddings are thermal and chemical stablity to include resistance to moisture; low surface tack; t~ughness and abra~ion resistance; and, especially important, a high level of adherence to the core material. Additional information concerning fiber optical constructions may be obtained from a book entitled "Optical Fiber Telecommunication", edited by S.E. Miller and A.G.
Chynoweth, Academic Press: New York, 1979; Chapter 10 by L.L. Blyler, Jr., et àl., deals specifically with claddings and is incorporated as a general reference.
As a general rule, #ilanol groups reduce the light - tran#mitting qualities of a #iliceous core and it is - 15 desirable to minimize their concentration. - What is apparent from references such as A. Sartre, et al., J.
Non-Cryst. Solids, 66, 467 (1987), however, is that despite efforts to eliminate silanol groups from siliceous cores, silanol groups persist in low concentration, especially on the core surface. Therefore, as a siliceous molten core emer~e# from the furnace of a typical draw tower arrangement for preparing optical fibers, the external surface of the core contains silanol groups or will soon develop them.
Attempt# to covalently bond to a siliceous substrate (especially gla##) have largely involved reactions of alkoxysilane~ with surface silanol groups as depicted in equation (1), and a recent paper by J.P. Blitz, et al., J.
Am. Chem. Soc., 109 7141 (1987) is cited as a general reference examining the various po##ible linkages and experimental techniques utilized to probe the nature of the surface reaction.
~ ,~
n O OR
(RO)3SiR' + tO-'i-OH~ O-'i-O-~i-R~ + ROH (1) O O OR
~ .
Heterogeneous Siliceous Reactant (HSR) 13~013'-~
Whlle the product of equation (l) ls relatlvely stable and chemically lnert, there ls a problem in that at least one molecule of an alcohol (ROH), whlch somehow must be removed from the system, ls produced for every linkage formed. Removal of the alcohol can be a signlflcant problem when relatlvely hydrophoblc polymers are involved. These polymers do not allow facile passage and removal of the alcohol molecule. The presence of residual alcohol can lead to voids and imperfectlons ln a resultant coatlng and can oftentlmes be a problem wlth an alkoxysllane/fluoropolymer claddlng of a slllceous optlcal flbre core as descrlbed ln U.S. patent No. 4,511,209.
It ls known ln the art that sllanol groups can be acetylated by conventlonal acetlc anhydrlde or acetyl chlorlde reagents to yleld the correspondlng sllyl acetates of equatlon (2), and a revlew artlcle by E.V. Kukharskaya and A.D. Fedoseva, Russ. Chem. Rev., 32, 490 (1963) ls cited for general reference.
C CH3CO) 2~ ~ Q HQCCH3 HSR t or~ - O- S I - OCCH3 + or~ ~ 2) The silyl acetate products are descrlbed as belng very molsture sensltive and more hydrophobic than the original HSR. In addltion, S. Fordham, "Slllcones", George Newnes Ltd.: London, P.
33 (1960) lndlcates that the sllyl acetate groups are not very thermally stable, revertlng blmolecularly to dlslloxane and acetlc anhydrlde.
1~4~13~
3a It is believed that the reaction of an azlactone and a silanol group to afford a silyl 2-amidoacetate has not been prevlously reported.
Summary of the Invention According to one aspect of the present invention there is provided an optlcal fibre comprising a covalently bound cladding composition comprlsing at least one compound whlch is a silyl 2-amidoacetate or a silyl 3-amidopropionate having the formula:
_ _ _ _ R2 ~ F~4 R6 o P~
l l l l l l N ~;~R 'R4 R1-~i-0-C-C C ~-nCNHC G C~ c~n~R5 l3 15 17 m 0 p-m wherein Rl, R and R are the same or different group and are selected from the class consisting of alkyl and aryl, hydroxy, and silyloxy groups, with the proviso that at most two of the groups are aryl;
R and R are independently hydrogen or lower alkyl;
n is 0 or 1;
R and R are independently an alkyl or cycloalkyl group, an aryl or aralkyl group, or R and R taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, with the proviso that only one of R6 and R can be aryl;
G is any polyvalent linking group unreactive with ~, 1~û13~
3b azlactone when m is at least 2, or G ls any monovalent termi.nal group unreactive with azlactone with p=m=l;
m can have any posltlve integral value from 1 to F' p can have any positive integral value from 1 to inflnity.
In another aspect there is provided a method of preparing a cladded optlcal fibre comprising the step of coa.ting a glass fibre with a composition as defined above.
Brlefly, the present lnvention provldes optlcal flbres with sllyl 2-amldoacetates and silyl 3-amidopropionates. These compounds are the reaction products of azlactone and silanol 1~013~
reactants. The products result from nucleophilic addition of a soluble or insoluble, low or high molecular weight reactant containing one or more silanol groups and a soluble or insoluble, low or high molecular weight reactant containing one or more azlactone groups. The reaction products provide for high adhesion between the siliceous and azlactone reactants, as would be useful to secure a cladding material to a siliceous core in a fiber optics construction. It has been recognized in the present invention that silyl 2-amidoacetates and silyl 3-amidopropionates are useful linkages between silanol and azlactone derived materials.
In this application:
"silyl 2-amidoacetates" and "silyl 3-amidopropionates" mean those structures of Formula III in which n=0 and 1, respectively; although IUPAC nomenclature would dictate complex names for these materials, in the interest of simplicity, the commonly used names "acetate~ and "propionate" are employed herein;
"alkyl" means the monovalent residue remaining after removal of a hydrogen atom from a linear or branched chain hydrocarbon having 1 to 14 carbon atoms;
"cycloalkyl" means the monovalent residue remaining after removal of a hydrogen atom from a cyclic hydrocarbon having 3 to 12 carbon atoms;
"lower alkyl" means C1 to C4 alkyl;
"aryl" means the monovalent residue remaining after F ~
~' I3~ 013.~
4a removal of a hydrogen atom from an aromatic compound (single ring and multi- and fused-cyclic) having 5 to 12 ring atoms and includes substituted aromatics such a~ lower alkaryl and aralkyl, lower alkoxy, N,N-di(lower alkyl)amino, nitro, cyano, and lower alkyl carboxylic ester, wherein "lower" means Cl to c4;
"azlactone" means 2-oxazolin-5-one groups of Formula I and 2-oxazin-6-one groups of Formula II;
"silanol" means a compound or a group having the -~iOH function;
1~013~
N~ / ~N- C~
- ,~C~ --C C~
C O--C\~,, \ C ' O
I II
"silyloxy" means ~SiOtx which can contain alkyl and aryl groups, and the SiO groups optionally can be interspersed with interpolymerized metal oxides such as oxides of boron, phosphorus, zirconium, molybdenum, and aluminum to form a glass which can be a network of essentially infinite molecular weight; x can have a value of 1 to infinity;
"soluble" and "insoluble" have their classical chemical meanings, i.e., dissolution being a physical and not chemical change, and are utilized because homogeneous/heterogeneous descriptions do not suffice, e.g., silica gel is a heterogeneous, insoluble reactant but homogeneous in appearance when not physically mixed with something else; soluble means at least 0.1 g dissolve6 in 100 g of any solvent at 23~C; insoluble means les6 than 0.1 g dis601ve6 in 100 g of any solvent at 23~C;
"low molecular weight" refers to ~oluble compounds of less than 1000 mass units (number average), whereas "high molecular weight" refers to soluble polymers at least 1000 mass units (number average) up to essentially infinite molecular weight and insoluble polymers and materials whose molecular weights are essentially infinite;
"siliceous" means of, relating to, or derived from silica or silicon-containing.
As mentioned above, fiber optics constructions consist of two or three components: a core, a cladding, and optionally a protective coating. Since the external surface of the siliceous core contains silanol groups, it is recognized in the instant invention that the core is an 13~013~
insoluble silanol-functional material capable of reacting with an azlactone. The reaction product silyl 2-amidoacetate or silyl 3-amidopropionate provides well-adhering claddings in a fiber optics construction.
Detailed DescriPtion of the Invention The silyl 2-amidoacetates and silyl 3-amidopropionates have the general Formula III
R~ O-C ( C ~ CNHC G C// ~C
R3 Rs 17 0_ ~
\\
m P--m siliceous amido linking ~71~~tc~n~
acetate group (n~o) (~'2) or or amido terlTIin~
propionate group (n=l) (m=p= 1) m 13~013~
6a wherein R1, R2, and R3 can be the same or different and can be alkyl or aryl groups, hydroxy, or silyloxy groups, with the proviso that at most two of the groups can be aryl;
R4 and R5 are independently hydrogen or lower alkyl;
n is O or 1;
F~
7 13~013~
R6 and R7 are independently an alkyl or cycloalkyl group, an aryl group, or R6 and R7 taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, with the proviso that only 5 ~ one of R6 and R7 can be aryl;
G is any polyvalent linking group unreactive with azlactone when m i8 at least 2; or G is any monovalent terminal group unreactive with azlactone when p-m-1;
m can have any positive integral value from 1 to p;
p can have any positive integral value from 1 to infinity when the number of azlactone groups is essentially that value (i.e., infinite) as part of an insoluble, crosslinked network.
G can contain the functionality that may be desired to be imparted to the silanol-bearing substrate provided the functionality is unreactive with azlactone. G can be a simple alkyl or aryl group or G can be quite complex containing multiple functional groups of essentially any kind that is unreactive with azlactone. The molecular weight of G can vary from 15, when G is methyl and p-m ~ 0, to several million (such as 5 million or more) when G is a soluble polymer group, and finally, to infinity, when G i5 an insoluble, crosslinked polymeric network.
G can have bonding capacity of 1, as when it is a terminal group, to es~entially infinite bonding capacity as when it is a linking group in a glassy network. Functional groups that can be incorporated in G include one or more of alkyl, - aryl, amide, ester, nitrile, nitro, sulfoxide, sulfone, azide, isocyanate, isothiocyanate, tertiary amine, ether, 30~ urethane, quaternary ammonium and phosphonium, halogen, and the like, wherein the functional groups requiring substituents are substituted with hydrogen where appropriate or lower alkyl so as not to mask the effect of the functional groups.
~ -8- 13~135 When Rl, R2, and R3 are silyloxy groups they can be soluble substituted silyloxy groups, i.e., polysiloxane groups with a molecular weight up of about 120 to 500,000 in which the substituents are additional substituted silyloxy groups for Rl and alkyl~and aryl for R2 and R3, and insoluble substituted silyloxy groups, i.e., a silica network structure in which Rl, R2, and R3 are silyloxy groups, optionally interspersed with interpolymerized oxides of boron, phosphorus, zirconium, molybdenum and aluminum;
The silyl 2-amidoacetates and silyl 3-amidopropionates of the invention are the nucleophilic addition reaction products of a silanol of Formula IV
~ ~2 Rl-~i-OH
_3 IV
(in which Rl, R2, and R3 are as defined above) and an azlactone of Formula V.
N - C
D ~, R
O C~
O _ ~, (in which R4, R5, R6, R7, p and G are as defined above) 9 1~ 10135 The Formula III reaction products have not previously been reported. The chemical reaction is shown below:
~ -- R6 ¦~R7 ~ -N--C
~2 ~ R4 mR - i-OH + G - C C
?.3 \ ~ R
, O--C~
O p IV V
~, , .
15 ~ _ _ R6 / R
N--C/
~2 o R4 R6 O ~ ~ R4 Rl -' i-O--C~C~ CNHC G C C/
?.3 R R7 \ ~ R5 ~0 _ " _ p _ "
III
Suitable silanol reactants or substrates of Formula IV
of the invention include any soluble or insoluble, low or high molecular weight material that contains at least one Si-OH group. Representative silanol reactants include:
(1) Low molecular weight, soluble ~ilanol materials are compounds of two types: (i) those that have only a transient existence and are essentially non-isolable, as they undergo dehydrative dimerization to disiloxanes at an appreciable rate, and (ii) those that are stable and isolable because at least one of the Rl, R2, or R3 --10- 13~0135 (as defined above) is aryl or alkyl (> C-2); this more bulky substitution slows the rate of disiloxane formation considerably. Compounds of the type (i) include trimethylsilanol and ethyldimethylsi~anol, and these - 5 compounds must be generated in relatively dilute solution (to ~low dimerization) and reacted immediately with the azlactone. Compound~ of the type (ii) include triethylsilanol, dimethyl(trimethylsilyloxy)silanol, diphenyldisilanol, phenylsilanetriol, and t-butyldimethylsilanol. These compounds are commercially available, for example, from Aldrich Chemical Co., Milwaukee, WI.
(2) High molecular weight, soluble silanol materials are silanol-terminated polydimethylsiloxanes, polydiphenylsiloxanes, polymethylphenylsiloxanes, and -11- 134013~
Suitable azlactone reactants of the invention include any soluble or insoluble, low or high molecular weight material that contains at least one azlactone group.
2-Vinyl-4,4-dimethylazlactone is commercially available from SNPE, Paris, France. When the value of p in Formula V
is one, the azlactone group, when reacted, serves primarily to covalently link the silanol substrate with the G group, and the property or modification desired to be imparted to the silanol reactant must be present in G. G may contain one or more functional groups which themselves do not react with the azlactone including alkyl, aryl, amide, ester, nitrile, nitro, sulfoxide, sulfone, azide, isocyanate, isothiocyanate, tertiary amine, ether, urethane, quaternary -- ammonium and phosphonium, halogen, and the like, wherein ~15 the functional groups requiring substituents are substituted with hydrogen where appropriate or lower alkyl so as not to mask the effect of the functional groups.
When the value of p in Formula V is not one, the G group may provide both the modifying functional groups or the linkage to other azlactone groups or both. This duality of purpose is especially true with high molecular weight, 2-alkenyl azlactone-containing copolymeric G groups. The nucleophilic addition reaction, especially with an insoluble silanol reactant, occurs at an interface and is non-stoichiometric with regard to the azlactone groups present, i.e., a portion of the azlactone groups will remain unreacted and p - m ~ 0. The useful amounts of silanol reactant to azlactone reactant can be in the range of 0.1 to 99.9 equivalents to 99.9 to 0.1 equivalents, peferably 1:99 to 99:1 equivalents, more preferably 10:90 to 90:10. Representative azlactone materials include:
(1) Low molecular weight, soluble azlactone materials include monoazlactones such as 2-alkyl and 2-aryl substituted azlactones, optionally containing the aforementioned functional groups, and polyazlactones of the type disclosed in U.S. Patent No. 4,485,236 as well as those reported in the general literature such as those reported by S.M. Heilmann, et al., J. Polymer Sci.: Polymer ~ -12- 134013.~
Chem. Ed., 24, 1 (1986). Preferred low molecular weight soluble azlactones include 2-vinyl-4,4-dimethylazlactone, 2-isopropenyl-4,4-dimethylazlactone, 2-vinyl-4,4-dimethyl-2-oxazin-6-one, 2-dodecyl-4,4-dimethylazlactone, _ -1,4-bis[(4,4-dimethyl-2-oxazolin-5-one-2-yl)lbutane, 1,5-bi~12-(4,4-dimethyl-2-oxazolin-S-one-2-yl)ethylthio]-
impo-rtant cladding materials. In addition to proper light handling characteristics, other desirable feature# of polymeric claddings are thermal and chemical stablity to include resistance to moisture; low surface tack; t~ughness and abra~ion resistance; and, especially important, a high level of adherence to the core material. Additional information concerning fiber optical constructions may be obtained from a book entitled "Optical Fiber Telecommunication", edited by S.E. Miller and A.G.
Chynoweth, Academic Press: New York, 1979; Chapter 10 by L.L. Blyler, Jr., et àl., deals specifically with claddings and is incorporated as a general reference.
As a general rule, #ilanol groups reduce the light - tran#mitting qualities of a #iliceous core and it is - 15 desirable to minimize their concentration. - What is apparent from references such as A. Sartre, et al., J.
Non-Cryst. Solids, 66, 467 (1987), however, is that despite efforts to eliminate silanol groups from siliceous cores, silanol groups persist in low concentration, especially on the core surface. Therefore, as a siliceous molten core emer~e# from the furnace of a typical draw tower arrangement for preparing optical fibers, the external surface of the core contains silanol groups or will soon develop them.
Attempt# to covalently bond to a siliceous substrate (especially gla##) have largely involved reactions of alkoxysilane~ with surface silanol groups as depicted in equation (1), and a recent paper by J.P. Blitz, et al., J.
Am. Chem. Soc., 109 7141 (1987) is cited as a general reference examining the various po##ible linkages and experimental techniques utilized to probe the nature of the surface reaction.
~ ,~
n O OR
(RO)3SiR' + tO-'i-OH~ O-'i-O-~i-R~ + ROH (1) O O OR
~ .
Heterogeneous Siliceous Reactant (HSR) 13~013'-~
Whlle the product of equation (l) ls relatlvely stable and chemically lnert, there ls a problem in that at least one molecule of an alcohol (ROH), whlch somehow must be removed from the system, ls produced for every linkage formed. Removal of the alcohol can be a signlflcant problem when relatlvely hydrophoblc polymers are involved. These polymers do not allow facile passage and removal of the alcohol molecule. The presence of residual alcohol can lead to voids and imperfectlons ln a resultant coatlng and can oftentlmes be a problem wlth an alkoxysllane/fluoropolymer claddlng of a slllceous optlcal flbre core as descrlbed ln U.S. patent No. 4,511,209.
It ls known ln the art that sllanol groups can be acetylated by conventlonal acetlc anhydrlde or acetyl chlorlde reagents to yleld the correspondlng sllyl acetates of equatlon (2), and a revlew artlcle by E.V. Kukharskaya and A.D. Fedoseva, Russ. Chem. Rev., 32, 490 (1963) ls cited for general reference.
C CH3CO) 2~ ~ Q HQCCH3 HSR t or~ - O- S I - OCCH3 + or~ ~ 2) The silyl acetate products are descrlbed as belng very molsture sensltive and more hydrophobic than the original HSR. In addltion, S. Fordham, "Slllcones", George Newnes Ltd.: London, P.
33 (1960) lndlcates that the sllyl acetate groups are not very thermally stable, revertlng blmolecularly to dlslloxane and acetlc anhydrlde.
1~4~13~
3a It is believed that the reaction of an azlactone and a silanol group to afford a silyl 2-amidoacetate has not been prevlously reported.
Summary of the Invention According to one aspect of the present invention there is provided an optlcal fibre comprising a covalently bound cladding composition comprlsing at least one compound whlch is a silyl 2-amidoacetate or a silyl 3-amidopropionate having the formula:
_ _ _ _ R2 ~ F~4 R6 o P~
l l l l l l N ~;~R 'R4 R1-~i-0-C-C C ~-nCNHC G C~ c~n~R5 l3 15 17 m 0 p-m wherein Rl, R and R are the same or different group and are selected from the class consisting of alkyl and aryl, hydroxy, and silyloxy groups, with the proviso that at most two of the groups are aryl;
R and R are independently hydrogen or lower alkyl;
n is 0 or 1;
R and R are independently an alkyl or cycloalkyl group, an aryl or aralkyl group, or R and R taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, with the proviso that only one of R6 and R can be aryl;
G is any polyvalent linking group unreactive with ~, 1~û13~
3b azlactone when m is at least 2, or G ls any monovalent termi.nal group unreactive with azlactone with p=m=l;
m can have any posltlve integral value from 1 to F' p can have any positive integral value from 1 to inflnity.
In another aspect there is provided a method of preparing a cladded optlcal fibre comprising the step of coa.ting a glass fibre with a composition as defined above.
Brlefly, the present lnvention provldes optlcal flbres with sllyl 2-amldoacetates and silyl 3-amidopropionates. These compounds are the reaction products of azlactone and silanol 1~013~
reactants. The products result from nucleophilic addition of a soluble or insoluble, low or high molecular weight reactant containing one or more silanol groups and a soluble or insoluble, low or high molecular weight reactant containing one or more azlactone groups. The reaction products provide for high adhesion between the siliceous and azlactone reactants, as would be useful to secure a cladding material to a siliceous core in a fiber optics construction. It has been recognized in the present invention that silyl 2-amidoacetates and silyl 3-amidopropionates are useful linkages between silanol and azlactone derived materials.
In this application:
"silyl 2-amidoacetates" and "silyl 3-amidopropionates" mean those structures of Formula III in which n=0 and 1, respectively; although IUPAC nomenclature would dictate complex names for these materials, in the interest of simplicity, the commonly used names "acetate~ and "propionate" are employed herein;
"alkyl" means the monovalent residue remaining after removal of a hydrogen atom from a linear or branched chain hydrocarbon having 1 to 14 carbon atoms;
"cycloalkyl" means the monovalent residue remaining after removal of a hydrogen atom from a cyclic hydrocarbon having 3 to 12 carbon atoms;
"lower alkyl" means C1 to C4 alkyl;
"aryl" means the monovalent residue remaining after F ~
~' I3~ 013.~
4a removal of a hydrogen atom from an aromatic compound (single ring and multi- and fused-cyclic) having 5 to 12 ring atoms and includes substituted aromatics such a~ lower alkaryl and aralkyl, lower alkoxy, N,N-di(lower alkyl)amino, nitro, cyano, and lower alkyl carboxylic ester, wherein "lower" means Cl to c4;
"azlactone" means 2-oxazolin-5-one groups of Formula I and 2-oxazin-6-one groups of Formula II;
"silanol" means a compound or a group having the -~iOH function;
1~013~
N~ / ~N- C~
- ,~C~ --C C~
C O--C\~,, \ C ' O
I II
"silyloxy" means ~SiOtx which can contain alkyl and aryl groups, and the SiO groups optionally can be interspersed with interpolymerized metal oxides such as oxides of boron, phosphorus, zirconium, molybdenum, and aluminum to form a glass which can be a network of essentially infinite molecular weight; x can have a value of 1 to infinity;
"soluble" and "insoluble" have their classical chemical meanings, i.e., dissolution being a physical and not chemical change, and are utilized because homogeneous/heterogeneous descriptions do not suffice, e.g., silica gel is a heterogeneous, insoluble reactant but homogeneous in appearance when not physically mixed with something else; soluble means at least 0.1 g dissolve6 in 100 g of any solvent at 23~C; insoluble means les6 than 0.1 g dis601ve6 in 100 g of any solvent at 23~C;
"low molecular weight" refers to ~oluble compounds of less than 1000 mass units (number average), whereas "high molecular weight" refers to soluble polymers at least 1000 mass units (number average) up to essentially infinite molecular weight and insoluble polymers and materials whose molecular weights are essentially infinite;
"siliceous" means of, relating to, or derived from silica or silicon-containing.
As mentioned above, fiber optics constructions consist of two or three components: a core, a cladding, and optionally a protective coating. Since the external surface of the siliceous core contains silanol groups, it is recognized in the instant invention that the core is an 13~013~
insoluble silanol-functional material capable of reacting with an azlactone. The reaction product silyl 2-amidoacetate or silyl 3-amidopropionate provides well-adhering claddings in a fiber optics construction.
Detailed DescriPtion of the Invention The silyl 2-amidoacetates and silyl 3-amidopropionates have the general Formula III
R~ O-C ( C ~ CNHC G C// ~C
R3 Rs 17 0_ ~
\\
m P--m siliceous amido linking ~71~~tc~n~
acetate group (n~o) (~'2) or or amido terlTIin~
propionate group (n=l) (m=p= 1) m 13~013~
6a wherein R1, R2, and R3 can be the same or different and can be alkyl or aryl groups, hydroxy, or silyloxy groups, with the proviso that at most two of the groups can be aryl;
R4 and R5 are independently hydrogen or lower alkyl;
n is O or 1;
F~
7 13~013~
R6 and R7 are independently an alkyl or cycloalkyl group, an aryl group, or R6 and R7 taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, with the proviso that only 5 ~ one of R6 and R7 can be aryl;
G is any polyvalent linking group unreactive with azlactone when m i8 at least 2; or G is any monovalent terminal group unreactive with azlactone when p-m-1;
m can have any positive integral value from 1 to p;
p can have any positive integral value from 1 to infinity when the number of azlactone groups is essentially that value (i.e., infinite) as part of an insoluble, crosslinked network.
G can contain the functionality that may be desired to be imparted to the silanol-bearing substrate provided the functionality is unreactive with azlactone. G can be a simple alkyl or aryl group or G can be quite complex containing multiple functional groups of essentially any kind that is unreactive with azlactone. The molecular weight of G can vary from 15, when G is methyl and p-m ~ 0, to several million (such as 5 million or more) when G is a soluble polymer group, and finally, to infinity, when G i5 an insoluble, crosslinked polymeric network.
G can have bonding capacity of 1, as when it is a terminal group, to es~entially infinite bonding capacity as when it is a linking group in a glassy network. Functional groups that can be incorporated in G include one or more of alkyl, - aryl, amide, ester, nitrile, nitro, sulfoxide, sulfone, azide, isocyanate, isothiocyanate, tertiary amine, ether, 30~ urethane, quaternary ammonium and phosphonium, halogen, and the like, wherein the functional groups requiring substituents are substituted with hydrogen where appropriate or lower alkyl so as not to mask the effect of the functional groups.
~ -8- 13~135 When Rl, R2, and R3 are silyloxy groups they can be soluble substituted silyloxy groups, i.e., polysiloxane groups with a molecular weight up of about 120 to 500,000 in which the substituents are additional substituted silyloxy groups for Rl and alkyl~and aryl for R2 and R3, and insoluble substituted silyloxy groups, i.e., a silica network structure in which Rl, R2, and R3 are silyloxy groups, optionally interspersed with interpolymerized oxides of boron, phosphorus, zirconium, molybdenum and aluminum;
The silyl 2-amidoacetates and silyl 3-amidopropionates of the invention are the nucleophilic addition reaction products of a silanol of Formula IV
~ ~2 Rl-~i-OH
_3 IV
(in which Rl, R2, and R3 are as defined above) and an azlactone of Formula V.
N - C
D ~, R
O C~
O _ ~, (in which R4, R5, R6, R7, p and G are as defined above) 9 1~ 10135 The Formula III reaction products have not previously been reported. The chemical reaction is shown below:
~ -- R6 ¦~R7 ~ -N--C
~2 ~ R4 mR - i-OH + G - C C
?.3 \ ~ R
, O--C~
O p IV V
~, , .
15 ~ _ _ R6 / R
N--C/
~2 o R4 R6 O ~ ~ R4 Rl -' i-O--C~C~ CNHC G C C/
?.3 R R7 \ ~ R5 ~0 _ " _ p _ "
III
Suitable silanol reactants or substrates of Formula IV
of the invention include any soluble or insoluble, low or high molecular weight material that contains at least one Si-OH group. Representative silanol reactants include:
(1) Low molecular weight, soluble ~ilanol materials are compounds of two types: (i) those that have only a transient existence and are essentially non-isolable, as they undergo dehydrative dimerization to disiloxanes at an appreciable rate, and (ii) those that are stable and isolable because at least one of the Rl, R2, or R3 --10- 13~0135 (as defined above) is aryl or alkyl (> C-2); this more bulky substitution slows the rate of disiloxane formation considerably. Compounds of the type (i) include trimethylsilanol and ethyldimethylsi~anol, and these - 5 compounds must be generated in relatively dilute solution (to ~low dimerization) and reacted immediately with the azlactone. Compound~ of the type (ii) include triethylsilanol, dimethyl(trimethylsilyloxy)silanol, diphenyldisilanol, phenylsilanetriol, and t-butyldimethylsilanol. These compounds are commercially available, for example, from Aldrich Chemical Co., Milwaukee, WI.
(2) High molecular weight, soluble silanol materials are silanol-terminated polydimethylsiloxanes, polydiphenylsiloxanes, polymethylphenylsiloxanes, and -11- 134013~
Suitable azlactone reactants of the invention include any soluble or insoluble, low or high molecular weight material that contains at least one azlactone group.
2-Vinyl-4,4-dimethylazlactone is commercially available from SNPE, Paris, France. When the value of p in Formula V
is one, the azlactone group, when reacted, serves primarily to covalently link the silanol substrate with the G group, and the property or modification desired to be imparted to the silanol reactant must be present in G. G may contain one or more functional groups which themselves do not react with the azlactone including alkyl, aryl, amide, ester, nitrile, nitro, sulfoxide, sulfone, azide, isocyanate, isothiocyanate, tertiary amine, ether, urethane, quaternary -- ammonium and phosphonium, halogen, and the like, wherein ~15 the functional groups requiring substituents are substituted with hydrogen where appropriate or lower alkyl so as not to mask the effect of the functional groups.
When the value of p in Formula V is not one, the G group may provide both the modifying functional groups or the linkage to other azlactone groups or both. This duality of purpose is especially true with high molecular weight, 2-alkenyl azlactone-containing copolymeric G groups. The nucleophilic addition reaction, especially with an insoluble silanol reactant, occurs at an interface and is non-stoichiometric with regard to the azlactone groups present, i.e., a portion of the azlactone groups will remain unreacted and p - m ~ 0. The useful amounts of silanol reactant to azlactone reactant can be in the range of 0.1 to 99.9 equivalents to 99.9 to 0.1 equivalents, peferably 1:99 to 99:1 equivalents, more preferably 10:90 to 90:10. Representative azlactone materials include:
(1) Low molecular weight, soluble azlactone materials include monoazlactones such as 2-alkyl and 2-aryl substituted azlactones, optionally containing the aforementioned functional groups, and polyazlactones of the type disclosed in U.S. Patent No. 4,485,236 as well as those reported in the general literature such as those reported by S.M. Heilmann, et al., J. Polymer Sci.: Polymer ~ -12- 134013.~
Chem. Ed., 24, 1 (1986). Preferred low molecular weight soluble azlactones include 2-vinyl-4,4-dimethylazlactone, 2-isopropenyl-4,4-dimethylazlactone, 2-vinyl-4,4-dimethyl-2-oxazin-6-one, 2-dodecyl-4,4-dimethylazlactone, _ -1,4-bis[(4,4-dimethyl-2-oxazolin-5-one-2-yl)lbutane, 1,5-bi~12-(4,4-dimethyl-2-oxazolin-S-one-2-yl)ethylthio]-
3-oxapentane, and the like.
(2) High molecular weiqht, soluble azlactone material6 include any free radical addition copolymers of 2-alkenyl azlactones such as those disclosed in U.S. Patent No. 4,304,70S. Not mentioned specifically in that reference but very useful in the present invention are fluorinated comonomers such as 2-fluoroethyl, 2,2,2-trifluoroethyl, 2,2~3,3-tetrafluoropropyl, hexafluoroisopropyl, l,l-dihydroperfluorobutyl, lH,lH,5H-octafluoropentyl, perfluorocyclohexyl, l,l-dihydroperfluorooctyl, lH,lH,2H,2H-heptadecafluorodecyl, and lH,lH,llH-eicosafluoroundecyl acrylates and methacrylates;
fluorinated styrenes such as o-, m-, and p-fluorostyrene and pentafluorostyrene; and others. Preferred high molecular weight soluble azlactones include copolymers containing at least one part by weight of an 2-alkenyl azlactone such as 2-vinyl-4,4-dimethylazlactone and vinyl chloride, ethyl acrylate, styrene, methyl methacrylate, the aforementioned fluorinated monomers, and combinations thereof.
(3) Insoluble azlactone material~ possessing essentially an infinite molecular weight include those 2-alkenyl azlactone copolymers with the aforementioned mono(ethylenically unsaturated) comonomers and at least one multi(ethylenically unsaturated) comonomer, whose copolymerization results in the joining of polymer chains causing crosslinking and insolubilization. Suitable multi(ethylenically unsaturated) comonomers include but are not limited to those disclosed in U.S. Patent No.
~ -13- 134~135
(2) High molecular weiqht, soluble azlactone material6 include any free radical addition copolymers of 2-alkenyl azlactones such as those disclosed in U.S. Patent No. 4,304,70S. Not mentioned specifically in that reference but very useful in the present invention are fluorinated comonomers such as 2-fluoroethyl, 2,2,2-trifluoroethyl, 2,2~3,3-tetrafluoropropyl, hexafluoroisopropyl, l,l-dihydroperfluorobutyl, lH,lH,5H-octafluoropentyl, perfluorocyclohexyl, l,l-dihydroperfluorooctyl, lH,lH,2H,2H-heptadecafluorodecyl, and lH,lH,llH-eicosafluoroundecyl acrylates and methacrylates;
fluorinated styrenes such as o-, m-, and p-fluorostyrene and pentafluorostyrene; and others. Preferred high molecular weight soluble azlactones include copolymers containing at least one part by weight of an 2-alkenyl azlactone such as 2-vinyl-4,4-dimethylazlactone and vinyl chloride, ethyl acrylate, styrene, methyl methacrylate, the aforementioned fluorinated monomers, and combinations thereof.
(3) Insoluble azlactone material~ possessing essentially an infinite molecular weight include those 2-alkenyl azlactone copolymers with the aforementioned mono(ethylenically unsaturated) comonomers and at least one multi(ethylenically unsaturated) comonomer, whose copolymerization results in the joining of polymer chains causing crosslinking and insolubilization. Suitable multi(ethylenically unsaturated) comonomers include but are not limited to those disclosed in U.S. Patent No.
~ -13- 134~135
4,379,201. Since the~e copolymers, once formed, are insoluble and thermosetting, they are generally prepared directly in the end-use configuration. With an insoluble, silanol material, fQr example, the comonomer formulation leading to the insoluble, azlactone material is often photopolymerized by standard techniques well known in the art directly onto the siliceous reactant. Other insoluble, azlactone materials useful in the present invention include the crosslinked, hydrophilic, azlactone-functional polymer 10beads disclosed in U.S. Patent No. 4,737,560. Preferred insoluble azlactones include cyclodehydrated products resulting from reverse suspension polymerization of combinations of N,N-dimethylacrylamide, sodium N-acrylamido)methylalanate, and methylenebisacrylamide.
15Representative examples of silyl 2-amidoacetat-e and silyl 3-amidopropionate compositions of the invention include reaction products of all combinations of silanol and azlactone reactants. Representative examples are shown in TABLE I below.
TABLE I
LOW MOLECULAR WEIGHT, SOLUBLE
Silanol Azlactone ~CH3 N - CH3 ~N ~ CH3 ~,),C-S10~ C~,-C~C~ ~ C" ~,5C~
CH3 rH3 ÇH3 (CH3)3SiO'iOH ~ N~ /~ ~ 3 CH3 CH3 ~C-~CH2 ~ C~ ~ O
o O
O
~H3 O N- CH
CH3cH2c-cH2occH2scH2cH2c~ ~ ~
O _3 -14- 134013~
- HIGH MOLECULAR WEIGHT, SOLUBLE
Silanol Azlactone 3 1 3 CH3 ~n
15Representative examples of silyl 2-amidoacetat-e and silyl 3-amidopropionate compositions of the invention include reaction products of all combinations of silanol and azlactone reactants. Representative examples are shown in TABLE I below.
TABLE I
LOW MOLECULAR WEIGHT, SOLUBLE
Silanol Azlactone ~CH3 N - CH3 ~N ~ CH3 ~,),C-S10~ C~,-C~C~ ~ C" ~,5C~
CH3 rH3 ÇH3 (CH3)3SiO'iOH ~ N~ /~ ~ 3 CH3 CH3 ~C-~CH2 ~ C~ ~ O
o O
O
~H3 O N- CH
CH3cH2c-cH2occH2scH2cH2c~ ~ ~
O _3 -14- 134013~
- HIGH MOLECULAR WEIGHT, SOLUBLE
Silanol Azlactone 3 1 3 CH3 ~n
5 HO~i~O-Si ~1OSiOH ~ N
CH3 CH3 CH3 _ ~ CH3 ~. 1 CO2 ~ N
CH2 ~ CH3 C7 Fl 5 ~ CH3 - INSOLUBLE
- 15 Silanol Azlactone ~O-Si-OH HC ~ CH3 HSR ¦ O ~ O
(in which the structures between the parenthese~
are a partial structure of a cros~linked polymer) The reaction products of the invention are prepared by mixing the azlactone and silanol reactants, preferably in - the absence of solvent and optionally in the presence of a catalyst. Reaction occurs slowly at room temperature, and 30- it is generally desirable to warm the mixture to 25-200~C, preferably 50-200~C, and most preferably from 100-200~C fQr a period of a few seconds at higher temperatures to several days when the reaction temperature is relatively low.
Cyclic amidine catalysts such as 1,8-diazabicyclol5.4.0lundec-7-ene (DBU) and 1,5-diazabicyclo[4.3.0lnon-5-ene (D~N) in concentrations of from 0.1 to 10.0 mole percent can be employed to hasten completion of the reaction. If solvents are required, they -15- 1~ ~013~
must not react with the azlactone reactant, and ~uitable solvents include ethyl acetatè, toluenej chloroform, dichloromethane, tetrahydrofuran, and fluorinated solvents such as FreonR 113 (Dupont), when fluorinated azlactone materials are employed. The-progress of the reaction and the nature of the reaction product are most ea~ily examined by observing a carbonyl stretching absorption band in the infrared spectrum at about 5.8 micrometers (1720 cm~~) for the Si-0-C~0 group. Alternatively, NMR is useful, especially with soluble reactants. The terminal Si(CH3 )2 H-NMR resonance of a polydimethylsiloxane silanol-functional material, for example, is shifted downfield 0.2-0.3 ppm relative to starting silanol upon reaction with an azlactone; similarly, 9Si-NMR results in a downfiel~ shift for the terminal silicon of ca. 4 ppm.
The 2-amidoacetate and 3-amidopropionate groups of the invention function as covalent linkages to modify and adhere silanol and azlactone functional materials. The linkages are useful with all the various reactant combinations but are especially so with insoluble siliceous substrates such as glasses, ceramics, gels, zeolites and the like, and stable modifications of these familiar sub~trates have a myriad of applications. One such application as a cladding system for a siliceous core in a fiber optics construction is exemplified below.
This invention is particularly useful as a method of providing a cladded optical fiber by coating a glass fiber _ with a composition comprising an azlactone which can be either a monomer or a polymer. In the case of a monomer, after coating, the cladded fiber can be subjected to UV
radiation to effect curing.
Objects and advantages of this invention are further illustrated by the following examples, but the particular materials and amounts thereof recited in these examples, as well as other conditions and details, should not be construed to unduly limit this invention.
-16- 1 ~ -;1 0 1 3 .~
Preparation of t-Butyldimethylsilyl ~ 2-Acrylamido-2,2-dimethylacetate CH CH
CH3 CH3 ~ N DBU Cl H3 C~ H3 O ~CH, ~
CH3 - ~C--'-i-OH + o~CH3 ~ CH3 -f--S~ iOCCINHCCH-CH2 CH3 CH3 o CH3 CH3 CH3 CH3 A mixture of 2-vinyl-4,4-dimethylazlactone (VDM) (available from SNPE, Paris, France) (2.78 g, 20 mmoles), t-butyldimethylsilanol (available from Aldrich Chemical Co., Milwaukee, WI) (2.64 g, 20 mmoles) and Dsu (Aldrich) (150 uL, 1 mmole) was allowed to stand at~room temperature for 16 hours. The reaction mixture that resulted was almost completely crystalline. The white solid was slurried with hexanes (30 mL), collected by filtration, and dried in vacuo overnight to provide the desired ester which was identified by spectral analysis.
Preparation of t-Butyldimethylsilyl 2-Propanamido-2,2-dimethylacetate In a similar fashion to EXAMPLE 1, t-butyldimethylsilanol was reacted with 2-ethyl-4,4-dimethylazlactone (EDM) (prepared according to J. K. Rasmussen et al., J. Polymer Sci.: Polymer Chem. Ed., 24, 2739 (1986)). No catalyst was required when the reactants were heated at 150~C for one hour. The white solid was collected as above, and its structure was shown to correspond to the title material by its IR and NMR
spectra.
--17- 1 3~ 01 3.
Preparation of t-Butyldimethylsilyl 2-Benzamido-2,2-dimet~ylacetate In a similar fashion to EXAMPLE 2, t-butyldimethylsilanol was reacted with 2-phenyl-4,4-dimethylazlactone (prepared according to H.
Rodriguez et al., Tetrahedron, 27, 2425 (1971)).
CH2= CH
CH3 lCH3 CH3 ~ ~ N
HO-;~i ( OSi- ~21 O~i-OH + 2 O ~ CH3 IOI CIH3~~~ ~CH3 fH3 fH3lOICIH3O
CH2-CHCHNHIC- COSi (OSi ~ oSIiOCCINHCCH-CH2 Poly(dimethylsiloxane), silanol-terminated (available from Petrarch Systems, Bristol, PA) ~silanol equivalent weight 860, 4.38 g, 5.09 mequiv.), VDM (0.71 g, 5.09 mmoles), and 2,6-bis(t-butyl)-4-methylphenol (Aldrich) (5.09 mg as a stabilizer) were charged to an oven-dried vial. The vial was sealed and placed in an oven for one hour equilibrated at 150~C. lH-NMR analysis of a sample of the reaction mixture indicated a 1:1 mixture of starting materials and silyl ester. The remainder of the material was heated an additional two hours at 150~C to produced a 3:1 mixture of the desired product and starting materials.
134013~
5HO-Si-~O~i ~ O'i-OH + 2 C2H5 ~ ~ CH3 O fH3lO fH3 _H3 1 3 ~f 31~
10C H CNHC- COSi (O i~ - OSiOCCNHCC H
A reaction was conductèd similarly to that of EXAMPLE
-4, substituting EDM for the VDM reactant. After one hour 15at-150 C, NMR analysis indicated an 85% conversion to the silyl ester product.
OH OH OH OH OH
0--li--o-si-o-~i-o-si-o-~i-o O O O O O
25VI 900 C, 10h, -H2O
t s i' o\s i o s i o s i o s i o~
O O O O O
VII excess EDM
140~C, lh ~0--~0~5 i -O- ' i -O-S~--O\S i -0 O O O O O
VIII
-19- 13~013a Cabosil M-5 (available from Cabot Corp., Boston, MA) was heated at 900~C for 10 hours at < 1 Torr. Upon cooling, the dehydrated, non-sintered silica was sealed and placed in an anhydrous glove box in which all subsequent physical transfers to oven-dried Schlenk glassware were made. This heating condition according to R.K. Iler, "The Chemistry of Silica", Wiley-Interscience: New York, 1979, p. 645, dehydrates silica from a surface hydroxy concentration of 4.5 OH nanometer~2 (nm) to 0.66 OH nm~2 or 14.7% remaining surface hydroxyl groups. This amount correlates well with the theoretical 13.5% residual groups that remain from vicinal reactions of this type involving 1,3-diol structures (cf. P.J. Flory, J. Am. Chem. Soc., 61, 1518 (1938)). Chemically~ the extent of dehydration is fairly accurately depicted above with the HSR of Formula VI
yielding the HSR of Formula VII under these thermal conditions in which essentially only isolated silanol groups remain.
As a CONTROL experiment, 1-2 grams of the dried silica were placed in the Schlenk filtration apparatuC. The silica was washed with three, 20 mL portions of hexanes (freshly distilled from calcium hydride) under a dry nitrogen atmosphere. After drying at < 1 Torr. for 15 minutes, a portion of the silica was mixed with KBr, and the diffuse reflectance FTIR (Fourier transform infrared) spectrum was recorded (500 scans).
The reaction with EDM was accomplished with 1-2 grams of dried silica in the Schlenk apparatus as before, except 4 mL of freshly distilled EDM were added by syringe to completely cover and wet the silica reagent. The entire apparatus containing the heterogeneous mixture was placed in an oven for one hour at 140~C. After cooling, the mixture was filtered and washed with dry hexane in the Schlenk apparatus as before. After drying at < 1 Torr. for - 15 minutes, the diffuse reflectance FTIR spectrum was again recorded. The most notable observations about the spectra were that the band for the isolated silanol at about 3750 _ -20- 134013a cm~l had almost completely disappeared, and, along with absorption bands for residual and adsorbed EDM, other bands were present which could be assigned to the desired nucleophilic addition prod~uct (Formula VIII).
The direct observation of the nucleophilic addition product of an insoluble silanol and EDM is extremely important because EDM is an excellent model for a pendant azlactone on a polymer. The core can simply be regarded as an insoluble, ~ilanol-functional material, for example HSR
above, capable of reacting with an azlactone.
Preparation of the Polymeric Claddings ~ _ l,1-Dihydroperfluorooctyl methacrylate (FOM) - (available from Monomer-Polymer & Dajac Laboratories Inc., Trevose, PA) was shaken with anhydrous potassium carbonate, filtered, and vacuum distilled from copper powder. The colorless middle fraction distilling at 69-71~/1.2-1.5 Torr. was collected and utilized.
Bis(4-t-butylcyclohexyl)peroxydicarbonate (PercadoxTM16N;
available from Noury Chemical Corp., Burt, NY) and a chlorofluorocarbon solvent (FreonR 113, E.I. Du Pont de Nemours & Co., Wilmington, DE) were utilized as received.
A 900 mL glass bottle was charged with FOM (397.36 g), VDM (44.16 g), Freon~ 113 (662.28 g), and PercadoxTM 16N
(2.20 g). The solution was sparged briefly with nitrogen, sealed, and the bottle placed in an Atlas Launderometer (available from Atlas Electric Devices Co., Chicago, IL) at 43~C for 24 hours. A viscous, clear copolymer solution resulted, and the copolymer exhibited an inherent viscosity in FreonR 113 at 25 C of 0.22 dL/g. Similarly, a homopolymer of FOM was prepared as a CONTROL, and the homopolymer inherent viscosity was 0.19 dL/g.
-21- 1 3~ 01 3~l Evaluation of the Polymers as Cladding Materials - The FOM:VDM copolymer solution was applied in a draw tower arrangement similar to that depicted by L.L.~Blyler, Jr., et al., CHEMTECH, 680 (1987). The siliceous core consisted of a Diasil rod (available from Mitsubishi Rayon Co., Hiroshima, Japan) heated to 2200~C and drawn to a diameter of 200 micrometers. Application of the copolymer from solution in a bath coater was followed by passing the cladded core into an oven equilibrated at 200~C (residence time about 3 seconds). The diameter of the cladding applied under these condition~ was about 10 micrometers.
The cladded core construction was non-tacky, quite tough, -- and was able to be repeatedly flexed without causing delamination of the cladding. The cladding-was extremely adherent to the core and could not be peeled from it. In contrast, huge sections of cladding were easily removed from a similar cladded core construction prepared with the CONTRO~ FOM homopolymer. The FOM:VDM cladded core provided a numerical aperature of 0.51 and an attenuation loss (at 812 nm) of 3.6 dB/km when evaluated according to procedures put forth by the American National Standards Institute in "Generic Specifications for Optical Waveguides", EIA-492, April 1985.
Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the scope and spirit of this invention, and it should be understood that this invention is not to be unduly limited to the illustrative embodiments set forth herein.
CH3 CH3 CH3 _ ~ CH3 ~. 1 CO2 ~ N
CH2 ~ CH3 C7 Fl 5 ~ CH3 - INSOLUBLE
- 15 Silanol Azlactone ~O-Si-OH HC ~ CH3 HSR ¦ O ~ O
(in which the structures between the parenthese~
are a partial structure of a cros~linked polymer) The reaction products of the invention are prepared by mixing the azlactone and silanol reactants, preferably in - the absence of solvent and optionally in the presence of a catalyst. Reaction occurs slowly at room temperature, and 30- it is generally desirable to warm the mixture to 25-200~C, preferably 50-200~C, and most preferably from 100-200~C fQr a period of a few seconds at higher temperatures to several days when the reaction temperature is relatively low.
Cyclic amidine catalysts such as 1,8-diazabicyclol5.4.0lundec-7-ene (DBU) and 1,5-diazabicyclo[4.3.0lnon-5-ene (D~N) in concentrations of from 0.1 to 10.0 mole percent can be employed to hasten completion of the reaction. If solvents are required, they -15- 1~ ~013~
must not react with the azlactone reactant, and ~uitable solvents include ethyl acetatè, toluenej chloroform, dichloromethane, tetrahydrofuran, and fluorinated solvents such as FreonR 113 (Dupont), when fluorinated azlactone materials are employed. The-progress of the reaction and the nature of the reaction product are most ea~ily examined by observing a carbonyl stretching absorption band in the infrared spectrum at about 5.8 micrometers (1720 cm~~) for the Si-0-C~0 group. Alternatively, NMR is useful, especially with soluble reactants. The terminal Si(CH3 )2 H-NMR resonance of a polydimethylsiloxane silanol-functional material, for example, is shifted downfield 0.2-0.3 ppm relative to starting silanol upon reaction with an azlactone; similarly, 9Si-NMR results in a downfiel~ shift for the terminal silicon of ca. 4 ppm.
The 2-amidoacetate and 3-amidopropionate groups of the invention function as covalent linkages to modify and adhere silanol and azlactone functional materials. The linkages are useful with all the various reactant combinations but are especially so with insoluble siliceous substrates such as glasses, ceramics, gels, zeolites and the like, and stable modifications of these familiar sub~trates have a myriad of applications. One such application as a cladding system for a siliceous core in a fiber optics construction is exemplified below.
This invention is particularly useful as a method of providing a cladded optical fiber by coating a glass fiber _ with a composition comprising an azlactone which can be either a monomer or a polymer. In the case of a monomer, after coating, the cladded fiber can be subjected to UV
radiation to effect curing.
Objects and advantages of this invention are further illustrated by the following examples, but the particular materials and amounts thereof recited in these examples, as well as other conditions and details, should not be construed to unduly limit this invention.
-16- 1 ~ -;1 0 1 3 .~
Preparation of t-Butyldimethylsilyl ~ 2-Acrylamido-2,2-dimethylacetate CH CH
CH3 CH3 ~ N DBU Cl H3 C~ H3 O ~CH, ~
CH3 - ~C--'-i-OH + o~CH3 ~ CH3 -f--S~ iOCCINHCCH-CH2 CH3 CH3 o CH3 CH3 CH3 CH3 A mixture of 2-vinyl-4,4-dimethylazlactone (VDM) (available from SNPE, Paris, France) (2.78 g, 20 mmoles), t-butyldimethylsilanol (available from Aldrich Chemical Co., Milwaukee, WI) (2.64 g, 20 mmoles) and Dsu (Aldrich) (150 uL, 1 mmole) was allowed to stand at~room temperature for 16 hours. The reaction mixture that resulted was almost completely crystalline. The white solid was slurried with hexanes (30 mL), collected by filtration, and dried in vacuo overnight to provide the desired ester which was identified by spectral analysis.
Preparation of t-Butyldimethylsilyl 2-Propanamido-2,2-dimethylacetate In a similar fashion to EXAMPLE 1, t-butyldimethylsilanol was reacted with 2-ethyl-4,4-dimethylazlactone (EDM) (prepared according to J. K. Rasmussen et al., J. Polymer Sci.: Polymer Chem. Ed., 24, 2739 (1986)). No catalyst was required when the reactants were heated at 150~C for one hour. The white solid was collected as above, and its structure was shown to correspond to the title material by its IR and NMR
spectra.
--17- 1 3~ 01 3.
Preparation of t-Butyldimethylsilyl 2-Benzamido-2,2-dimet~ylacetate In a similar fashion to EXAMPLE 2, t-butyldimethylsilanol was reacted with 2-phenyl-4,4-dimethylazlactone (prepared according to H.
Rodriguez et al., Tetrahedron, 27, 2425 (1971)).
CH2= CH
CH3 lCH3 CH3 ~ ~ N
HO-;~i ( OSi- ~21 O~i-OH + 2 O ~ CH3 IOI CIH3~~~ ~CH3 fH3 fH3lOICIH3O
CH2-CHCHNHIC- COSi (OSi ~ oSIiOCCINHCCH-CH2 Poly(dimethylsiloxane), silanol-terminated (available from Petrarch Systems, Bristol, PA) ~silanol equivalent weight 860, 4.38 g, 5.09 mequiv.), VDM (0.71 g, 5.09 mmoles), and 2,6-bis(t-butyl)-4-methylphenol (Aldrich) (5.09 mg as a stabilizer) were charged to an oven-dried vial. The vial was sealed and placed in an oven for one hour equilibrated at 150~C. lH-NMR analysis of a sample of the reaction mixture indicated a 1:1 mixture of starting materials and silyl ester. The remainder of the material was heated an additional two hours at 150~C to produced a 3:1 mixture of the desired product and starting materials.
134013~
5HO-Si-~O~i ~ O'i-OH + 2 C2H5 ~ ~ CH3 O fH3lO fH3 _H3 1 3 ~f 31~
10C H CNHC- COSi (O i~ - OSiOCCNHCC H
A reaction was conductèd similarly to that of EXAMPLE
-4, substituting EDM for the VDM reactant. After one hour 15at-150 C, NMR analysis indicated an 85% conversion to the silyl ester product.
OH OH OH OH OH
0--li--o-si-o-~i-o-si-o-~i-o O O O O O
25VI 900 C, 10h, -H2O
t s i' o\s i o s i o s i o s i o~
O O O O O
VII excess EDM
140~C, lh ~0--~0~5 i -O- ' i -O-S~--O\S i -0 O O O O O
VIII
-19- 13~013a Cabosil M-5 (available from Cabot Corp., Boston, MA) was heated at 900~C for 10 hours at < 1 Torr. Upon cooling, the dehydrated, non-sintered silica was sealed and placed in an anhydrous glove box in which all subsequent physical transfers to oven-dried Schlenk glassware were made. This heating condition according to R.K. Iler, "The Chemistry of Silica", Wiley-Interscience: New York, 1979, p. 645, dehydrates silica from a surface hydroxy concentration of 4.5 OH nanometer~2 (nm) to 0.66 OH nm~2 or 14.7% remaining surface hydroxyl groups. This amount correlates well with the theoretical 13.5% residual groups that remain from vicinal reactions of this type involving 1,3-diol structures (cf. P.J. Flory, J. Am. Chem. Soc., 61, 1518 (1938)). Chemically~ the extent of dehydration is fairly accurately depicted above with the HSR of Formula VI
yielding the HSR of Formula VII under these thermal conditions in which essentially only isolated silanol groups remain.
As a CONTROL experiment, 1-2 grams of the dried silica were placed in the Schlenk filtration apparatuC. The silica was washed with three, 20 mL portions of hexanes (freshly distilled from calcium hydride) under a dry nitrogen atmosphere. After drying at < 1 Torr. for 15 minutes, a portion of the silica was mixed with KBr, and the diffuse reflectance FTIR (Fourier transform infrared) spectrum was recorded (500 scans).
The reaction with EDM was accomplished with 1-2 grams of dried silica in the Schlenk apparatus as before, except 4 mL of freshly distilled EDM were added by syringe to completely cover and wet the silica reagent. The entire apparatus containing the heterogeneous mixture was placed in an oven for one hour at 140~C. After cooling, the mixture was filtered and washed with dry hexane in the Schlenk apparatus as before. After drying at < 1 Torr. for - 15 minutes, the diffuse reflectance FTIR spectrum was again recorded. The most notable observations about the spectra were that the band for the isolated silanol at about 3750 _ -20- 134013a cm~l had almost completely disappeared, and, along with absorption bands for residual and adsorbed EDM, other bands were present which could be assigned to the desired nucleophilic addition prod~uct (Formula VIII).
The direct observation of the nucleophilic addition product of an insoluble silanol and EDM is extremely important because EDM is an excellent model for a pendant azlactone on a polymer. The core can simply be regarded as an insoluble, ~ilanol-functional material, for example HSR
above, capable of reacting with an azlactone.
Preparation of the Polymeric Claddings ~ _ l,1-Dihydroperfluorooctyl methacrylate (FOM) - (available from Monomer-Polymer & Dajac Laboratories Inc., Trevose, PA) was shaken with anhydrous potassium carbonate, filtered, and vacuum distilled from copper powder. The colorless middle fraction distilling at 69-71~/1.2-1.5 Torr. was collected and utilized.
Bis(4-t-butylcyclohexyl)peroxydicarbonate (PercadoxTM16N;
available from Noury Chemical Corp., Burt, NY) and a chlorofluorocarbon solvent (FreonR 113, E.I. Du Pont de Nemours & Co., Wilmington, DE) were utilized as received.
A 900 mL glass bottle was charged with FOM (397.36 g), VDM (44.16 g), Freon~ 113 (662.28 g), and PercadoxTM 16N
(2.20 g). The solution was sparged briefly with nitrogen, sealed, and the bottle placed in an Atlas Launderometer (available from Atlas Electric Devices Co., Chicago, IL) at 43~C for 24 hours. A viscous, clear copolymer solution resulted, and the copolymer exhibited an inherent viscosity in FreonR 113 at 25 C of 0.22 dL/g. Similarly, a homopolymer of FOM was prepared as a CONTROL, and the homopolymer inherent viscosity was 0.19 dL/g.
-21- 1 3~ 01 3~l Evaluation of the Polymers as Cladding Materials - The FOM:VDM copolymer solution was applied in a draw tower arrangement similar to that depicted by L.L.~Blyler, Jr., et al., CHEMTECH, 680 (1987). The siliceous core consisted of a Diasil rod (available from Mitsubishi Rayon Co., Hiroshima, Japan) heated to 2200~C and drawn to a diameter of 200 micrometers. Application of the copolymer from solution in a bath coater was followed by passing the cladded core into an oven equilibrated at 200~C (residence time about 3 seconds). The diameter of the cladding applied under these condition~ was about 10 micrometers.
The cladded core construction was non-tacky, quite tough, -- and was able to be repeatedly flexed without causing delamination of the cladding. The cladding-was extremely adherent to the core and could not be peeled from it. In contrast, huge sections of cladding were easily removed from a similar cladded core construction prepared with the CONTRO~ FOM homopolymer. The FOM:VDM cladded core provided a numerical aperature of 0.51 and an attenuation loss (at 812 nm) of 3.6 dB/km when evaluated according to procedures put forth by the American National Standards Institute in "Generic Specifications for Optical Waveguides", EIA-492, April 1985.
Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the scope and spirit of this invention, and it should be understood that this invention is not to be unduly limited to the illustrative embodiments set forth herein.
Claims (19)
1. An optical fiber comprising a covalently bound cladding composition comprising at least one compound which is a silyl 2-amidoacetate or a silyl 3-amidopropionate having the formula:
wherein R1, R2, and R3 are the same or different group and are selected from the class consisting of alkyl and aryl, hydroxy, and silyloxy groups, with the proviso that at most two of the groups are aryl;
R4 and R5 are independently hydrogen or lower alkyl;
n is 0 or 1;
R6 and R7 are independently an alkyl or cycloalkyl group, an aryl or aralkyl group, or R6 and R7 taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, with the proviso that only one of R6 and R7 can be aryl;
G is any polyvalent linking group unreactive with azlactone when m is at least 2, or G is any monovalent terminal group unreactive with azlactone when p=m=1;
m can have any positive integral value from 1 to p;
p can have any positive integral value from 1 to infinity.
wherein R1, R2, and R3 are the same or different group and are selected from the class consisting of alkyl and aryl, hydroxy, and silyloxy groups, with the proviso that at most two of the groups are aryl;
R4 and R5 are independently hydrogen or lower alkyl;
n is 0 or 1;
R6 and R7 are independently an alkyl or cycloalkyl group, an aryl or aralkyl group, or R6 and R7 taken together with the carbon to which they are joined can form a carbocyclic ring containing 4 to 12 ring atoms, with the proviso that only one of R6 and R7 can be aryl;
G is any polyvalent linking group unreactive with azlactone when m is at least 2, or G is any monovalent terminal group unreactive with azlactone when p=m=1;
m can have any positive integral value from 1 to p;
p can have any positive integral value from 1 to infinity.
2. The optical fiber according to claim 1 wherein said compound is the reaction product of a silanol-containing fiber core and an azlactone-containing cladding.
3. The optical fiber according to claim 1 wherein in said compound at least one of R1, R2, and R3 is a soluble or insoluble silyloxy group.
4. The optical fiber according to claim 3 wherein in said compound said soluble silyloxy group is a polysiloxane group.
5. The optical fiber according to claim 3 wherein in said compound said insoluble silyloxy group is a silica network.
6. The optical fiber according to claim 5 wherein in said compound said silica network is interspersed with interpolymerized oxides of at least one of boron, phosphorus, zirconium, molybdenum, and aluminum.
7. The optical fiber according to claim 1 wherein in said compound G comprises at least one functional group selected from the group consisting of alkyl, aryl, amide, ester, nitrile, nitro, sulfoxide, cellophane, azide, isocyanate, isothiocyanate, tertiary amine, ether, urethane, quaternary ammonium and phosphonium, halogen, and the like, wherein the functional groups requiring substituents are substituted with hydrogen where appropriate or lower alkyl so as not to mask the effect of the functional groups.
8. The optical fiber according to claim 1 wherein in said compound G has a molecular weight in the range of 15 to 5 million.
9. The optical fiber according to claim 1 wherein said composition further comprises in the range of 0.1 to 10.0 mole percent of a cyclic amidine catalyst.
10. The optical fiber according to claim 2 wherein in said compound said silanol has a molecular weight in the range of less than 1000 up to 500,000.
11. The optical fiber according to claim 2 wherein in said compound said silanol has an insoluble network structure having an essentially infinite molecular weight.
12. The optical fiber according to claim 11 wherein in said compound said network structure further comprises at least one atom selected from the group consisting of aluminum, sodium, phosphorus, boron, molybdenum, and magnesium atoms.
13. The optical fiber according to claim 11 wherein in said compound said insoluble silanol is a non-crystalline silica.
14. The optical fiber according to claim 1 wherein in said compound said azlactone is a monoazlactone.
15. The optical fiber according to claim 14 wherein in said compound said monoazlactone is a 2-alkyl or 2-aryl substituted azlactone.
16. The optical fiber according to claim 1 wherein in said compound said azlactone is a polyazlactone.
17. The optical fiber according to claim 1 wherein in said compound said azlactone is 2-alkenyl azlactone or a copolymer thereof.
18. The optical fiber according to claim 17 wherein in said compound said copolymeric 2-alkenyl azlactone is prepared from a mono- or multi(ethylenically unsaturated) comonomer.
19. A method of preparing a cladded optical fiber comprising the step of coating a glass fiber with a cladding composition as defined in any one of claims 1 to 18.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/169,377 US4852969A (en) | 1988-03-17 | 1988-03-17 | Silyl 2-amidoacetate and silyl 3-amidopropionate compositions and optical fiber made therefrom |
US169,377 | 1988-03-17 |
Publications (1)
Publication Number | Publication Date |
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CA1340135C true CA1340135C (en) | 1998-11-17 |
Family
ID=22615420
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Application Number | Title | Priority Date | Filing Date |
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CA000591515A Expired - Fee Related CA1340135C (en) | 1988-03-17 | 1989-02-20 | Silyl 2-amidoacetate and silyl 3-amidopropionate compositions |
Country Status (6)
Country | Link |
---|---|
US (1) | US4852969A (en) |
EP (1) | EP0333361A3 (en) |
JP (1) | JPH01301686A (en) |
KR (1) | KR890014689A (en) |
AU (1) | AU614333B2 (en) |
CA (1) | CA1340135C (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
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US5147957A (en) * | 1989-09-22 | 1992-09-15 | Minnesota Mining And Manufacturing Company | Hydrosilated azlactone functional silicon containing compounds and derivatives thereof |
CA2022615A1 (en) * | 1989-09-22 | 1991-03-23 | Kanta Kumar | Hydrosilated azlactone functional silicon containing compounds and derivatives thereof |
US5157108A (en) * | 1989-12-12 | 1992-10-20 | Minnesota Mining And Manufacturing Company | Thermally sensitive linkages |
US5268473A (en) * | 1990-03-28 | 1993-12-07 | Minnesota Mining And Manufacturing Company | Azlactone Michael adducts |
US5149806A (en) * | 1990-03-28 | 1992-09-22 | Minnesota Mining And Manufacturing Company | Azlactone michael adducts |
US5292514A (en) * | 1992-06-24 | 1994-03-08 | Minnesota Mining And Manufacturing Company | Azlactone-functional substrates, corneal prostheses, and manufacture and use thereof |
US5705585A (en) * | 1993-06-30 | 1998-01-06 | Arqule, Inc. | Aminimide-containing molecules and materials as molecular recognition agents |
JPH09507852A (en) * | 1994-01-05 | 1997-08-12 | アーキュール,インコーポレーテッド | Method for producing polymer having specific properties |
US7034110B2 (en) * | 1994-01-05 | 2006-04-25 | Arqule, Inc. | Method of identifying chemical compounds having selected properties for a particular application |
US5639843A (en) * | 1994-01-12 | 1997-06-17 | Minnesota Mining And Manufacturing Company | Organometallic acrylamide compositions and methods for making same, including antifouling agents and usage thereof |
US5734082A (en) * | 1994-10-20 | 1998-03-31 | Arqule Inc. | Hydroxyethyl aminimides |
US5712171A (en) * | 1995-01-20 | 1998-01-27 | Arqule, Inc. | Method of generating a plurality of chemical compounds in a spatially arranged array |
WO1996031263A1 (en) * | 1995-04-06 | 1996-10-10 | Arqule, Inc. | Method for rapid purification, analysis and characterization of collections of chemical compounds |
US5962412A (en) * | 1996-06-10 | 1999-10-05 | Arqule, Inc. | Method of making polymers having specific properties |
AUPQ197899A0 (en) * | 1999-08-02 | 1999-08-26 | Commonwealth Scientific And Industrial Research Organisation | Biomedical compositions |
AU2002950469A0 (en) * | 2002-07-30 | 2002-09-12 | Commonwealth Scientific And Industrial Research Organisation | Improved biomedical compositions |
US7483610B2 (en) * | 2004-05-03 | 2009-01-27 | Nufern | Optical fiber having reduced defect density |
WO2007128051A1 (en) * | 2006-05-03 | 2007-11-15 | Vision Crc Limited | Biological polysiloxanes |
AU2007247850B2 (en) | 2006-05-03 | 2013-05-02 | Vision Crc Limited | Eye treatment |
JP2008177094A (en) * | 2007-01-19 | 2008-07-31 | Yazaki Corp | Switch |
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US2827440A (en) * | 1956-12-13 | 1958-03-18 | Thatcher Glass Mfg Company Inc | Organopolysiloxane coating composition and method for coating glass therewith |
GB1583142A (en) * | 1976-05-12 | 1981-01-21 | Ici Ltd | Process for the preparation of polymer dispersions |
CA1221795A (en) * | 1982-02-24 | 1987-05-12 | Bolesh J. Skutnik | Optical fiber cladding |
US4496210A (en) * | 1982-07-19 | 1985-01-29 | Desoto, Inc. | Low temperature-flexible radiation-curable unsaturated polysiloxane coated fiber optic |
US4495361A (en) * | 1983-04-29 | 1985-01-22 | Bausch & Lomb Incorporated | Polysiloxane composition with improved surface wetting characteristics and biomedical devices made thereof |
US4695608A (en) * | 1984-03-29 | 1987-09-22 | Minnesota Mining And Manufacturing Company | Continuous process for making polymers having pendant azlactone or macromolecular moieties |
US4874822A (en) * | 1988-04-07 | 1989-10-17 | Minnesota Mining And Manufacturing Company | Process for the acrylamidoacylation of alcohols |
-
1988
- 1988-03-17 US US07/169,377 patent/US4852969A/en not_active Expired - Lifetime
-
1989
- 1989-02-17 AU AU30080/89A patent/AU614333B2/en not_active Ceased
- 1989-02-20 CA CA000591515A patent/CA1340135C/en not_active Expired - Fee Related
- 1989-03-06 EP EP19890302202 patent/EP0333361A3/en not_active Withdrawn
- 1989-03-16 KR KR1019890003237A patent/KR890014689A/en not_active Application Discontinuation
- 1989-03-16 JP JP1064894A patent/JPH01301686A/en active Pending
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AU3008089A (en) | 1989-09-21 |
US4852969A (en) | 1989-08-01 |
JPH01301686A (en) | 1989-12-05 |
KR890014689A (en) | 1989-10-25 |
AU614333B2 (en) | 1991-08-29 |
EP0333361A3 (en) | 1990-10-24 |
EP0333361A2 (en) | 1989-09-20 |
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