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Número de publicaciónUS20050054760 A1
Tipo de publicaciónSolicitud
Número de solicitudUS 10/878,862
Fecha de publicación10 Mar 2005
Fecha de presentación28 Jun 2004
Fecha de prioridad26 Ene 1999
También publicado comoCA2293170A1, CA2293170C, DE60038200D1, DE60038200T2, EP1024154A2, EP1024154A3, EP1024154B1, US6184287, US6365647, US6488764, US6755907, US7879965, US8592541, US20020049280, US20020103291, US20080312378, US20110130505, USRE43168
Número de publicación10878862, 878862, US 2005/0054760 A1, US 2005/054760 A1, US 20050054760 A1, US 20050054760A1, US 2005054760 A1, US 2005054760A1, US-A1-20050054760, US-A1-2005054760, US2005/0054760A1, US2005/054760A1, US20050054760 A1, US20050054760A1, US2005054760 A1, US2005054760A1
InventoresIra John Westerman
Cesionario originalIra John Westerman
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Gypsum wallboard
US 20050054760 A1
Resumen
Gypsum wallboard can be made lighter and less dense, without sacrificing strength, by adding to the gypsum slurry used in making the board a styrene butadiene polymer latex substantially stable against divalent ions in which the styrene butadiene polymer includes at least 0.25 wt. % of an ionic monomer.
Imágenes(5)
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Reclamaciones(25)
1. A composition for making gypsum products comprising
water,
calcium sulfate hemihydrate, and
a styrene butadiene polymer latex substantially stable against divalent ions in which the styrene butadiene polymer includes at least 0.25 wt. % of an ionic monomer.
2-22. (Cancelled)
23. A styrene butadiene polymer latex comprising:
about 4 to 70 wt. % butadiene;
about 20 to 95 wt. % styrene; and
at least 0.25 wt. % of an ionic monomer comprised of 2-acrylamido-2-methyl propanesulfonic acid salt,
wherein said polymer is substantially free of surfactants that impart stability against divalent ions.
24. The styrene butadiene polymer latex of claim 23, wherein the latex is substantially stable against divalent ions.
25. The styrene butadiene polymer latex of claim 23, further comprising a hydrophilic adjunct comonomer selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, acrylonitrile, methacrylocitrile, acrylamide, methacrylamide, and mixtures thereof.
26. The styrene butadiene polymer latex of claim 25, wherein the hydrophilic adjunct comonomer is hydroxyethyl acrylate.
27. The styrene butadiene polymer latex of claim 23, wherein the ratio of styrene to butadiene is in the range of 10:1 to 1:1.
28. The styrene butadiene latex of claim 23, wherein the 2-acrylamido-2-methyl propanesulfonic acid salt is sodium 2-acrylamido-2-methyl propanesulfonic acid.
29. A styrene butadiene polymer latex that is substantially stable against divalent ions, said latex comprising:
about 7 to 40 wt. % butadiene;
about 45 to 90 wt. % styrene;
about 0.25 to 20 wt. % of an ionic monomer comprised of 2-acrylamido-2-methyl propanesulfonic acid salt;
wherein the ratio of styrene to butadiene is in a range of 7:1 to 1.5:1.
30. The styrene butadiene polymer latex of claim 29, wherein said 2-acrylamido-2-methyl propanesulfonic acid salt is sodium 2-acrylamido-2-methyl propanesulfonic acid.
31. The styrene butadiene polymer latex of claim 29, further comprising a hydrophilic adjunct comonomer selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, and mixtures thereof.
32. The styrene butadiene polymer latex of claim 31, wherein the hydrophilic adjunct comonomer is present in an amount of about 0.25 to 20 wt. % based on the weight of the polymer.
33. The styrene butadiene polymer latex of claim 31, wherein the hydrophilic adjunct comonomer is hydroxyethyl acrylate.
34. The styrene butadiene latex polymer of claim 31, wherein the polymer is substantially free of surfactants that impart stability against divalent ions.
35. An aqueous styrene butadiene polymer latex comprising:
about 10 to 30 wt. % butadiene;
about 65 to 85 wt. % styrene;
about 0.5 to 10 wt. % of an ionic monomer comprised of 2-acrylamido-2-methyl propanesulfonic acid salt; and
a hydrophilic adjunct comonomer selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, acrylonitrile, methyacrylonitrile, acrylamide, methacrylamide and combinations thereof, wherein said polymer latex is substantially stable against divalent ions.
36. The polymer latex of claim 35, wherein the hydrophilic adjunct comonomer is present in an amount of about 0.5 to 10 wt. %.
37. The polymer latex of claim 35, wherein the hydrophilic adjunct comonomer is hydroxyethyl acrylate.
38. The polymer latex of claim 35, wherein the hydrophilic adjunct comonomer is hydroxyethyl acrylate in an amount of about 0.5 to about 10 wt. %.
39. The polymer latex of claim 35, wherein the weight ratio styrene to butadiene is 7:1 to 1.5:1.
40. The polymer latex of claim 35, further comprising:
at least one monomer selected from the group consisting of isoprene, chloroprene, alpha-methylstyrene, 4-methylstyrene, 4-tert-butylstyrene, 4-ethylstyrene, divinylbenzene, vinylidene chloride, 2-vinylpyridene, 4-vinylpyridene, acrylic acid, methyacrylic acid, metal salts of acrylic acid and methyacrylic acid, ammonium salts of acrylic acid and methacrylic acid, substituted and unsubstituted amides of acrylic acid and methacrylic acid other than acrylamide and methacrylamide, nitriles of acrylic acid and methacrylic acid other than acrylonitrile and methacrylonitrile, and C1 to C12 esters of acrylic acid and methacrylic acid.
41. The polymer latex of claim 35, wherein the ratio of styrene to butadiene is in a range of 6:1 to 2:1.
42. The polymer latex of claim 35, wherein the hydrophilic adjunct is present in an amount of about 1 to about 4 wt. %.
43. The polymer latex of claim 35, wherein the 2-acrylamido-2-methyl propanesulfonic acid salt is present in an amount of about 1 to 5 wt. %.
44. The polymer latex of claim 35, wherein said polymer is substantially free of surfactants that impart stability against divalent ions.
45. The polymer latex of claim 35, wherein said 2-acrylamido-2-methyl propanesulfonic acid salt is sodium 2-acrylamido-2-methyl propanesulfonic acid.
Descripción
    CROSS-REFERENCE TO RELATED APPLICATION
  • [0001]
    The application on which this patent is based is a continuation-in-part of prior, commonly-assigned application Ser. No. 09/237,512, filed Jan. 26, 1999, now U.S. patent Ser. No. ______ (atty docket no GT-5100), the disclosure of which is incorporated herein by reference.
  • BACKGROUND OF THE INVENTION FIELD OF INVENTION
  • [0002]
    The present invention relates to improved gypsum wallboard and to materials and processes for making such products.
  • BACKGROUND
  • [0003]
    Gypsum wallboard is conventionally made by depositing an aqueous slurry of calcined gypsum (“gypsum slurry”) between large sheets of paper or other material and allowing the slurry to dry. Calcined gypsum is composed of calcium sulfate hemihydrate (CaSO4 ½H2O) which rehydrates to gypsum (CaSO4 2H2O) during the drying process. See Kirk Othmer, Encyclopedia of Chemical Technology, Second edition, 1970, Vol. 21, Pages 621-624, the disclosure of which is also incorporated herein by reference.
  • [0004]
    In order to achieve sufficient strength, traditional, commercial wallboard has been made with a density of about 1700 pounds (˜772 kg.) per thousand square feet of ½ inch thick board. Although it would be desirable to reduce this density and hence overall board weight, previous attempts have met with limited success, primarily due to loss of strength.
  • [0005]
    U.S. Pat. No. 5,879,825 to Burke et al., the disclosure of which is also incorporated herein by reference, describes an approach for reducing gypsum wallboard density without sacrificing strength by including in the gypsum core an acrylic latex having a particular combination of properties. Acrylic latexes are expensive, and therefore commercially unattractive. Therefore, it is desirable to develop an alternate and less expensive approach to accomplishing this objective.
  • SUMMARY OF THE INVENTION
  • [0006]
    In accordance with the present invention, it has been discovered that certain styrene butadiene latexes, modified to be substantially stable against divalent ions, can also reduce gypsum wallboard density without sacrificing strength. Because these latexes are generally less expensive to manufacture than acrylic latexes, it has also been found that commercial use of these latexes is feasible.
  • [0007]
    Accordingly, the present invention provides a new composition for making gypsum products comprising water, calcium sulfate hemihydrate and a styrene butadiene polymer latex substantially stable against divalent ions in which the styrene butadiene polymer includes at least 0.25 wt. % of an ionic monomer. In addition, the present invention also provides a new process for making gypsum wallboard from this composition as well as the wallboard so made. Preferably, the styrene butadiene polymer of the latex used in the present invention includes copolymerized sodium 2-acrylamido-2-methyl propanesulfonic acid salt, known industrially as “sodium AMPS.”
  • DETAILED DESCRIPTION
  • [0008]
    In accordance with the present invention, gypsum wall board can be made lighter in weight without sacrificing strength by including in the gypsum slurry used to make the board a styrene butadiene polymer latex substantially stable against divalent ions in which the styrene butadiene polymer includes at least 0.25 wt. % of an ionic monomer.
  • [0009]
    The styrene butadiene latexes used in accordance with the present invention are substantially stable against divalent ions. By “substantially stable against divalent ions” is meant that a latex will exhibit no significant coagulation or flocculation when 10 ml (milliliters) of a 2 wt. % calcium chloride aqueous solution is slowly added to 50 ml of the latex. By slowly added is meant that the calcium chloride solution is added to 50 ml of the latex with stirring over a period of time between 5 and 30 seconds.
  • [0010]
    The amount of styrene and butadiene in the polymers of these latexes can vary widely. For example, these polymers may contain 4 to 60 wt. % butadiene, more normally 7 to 40 wt. % butadiene and especially 10 to 30 wt. % butadiene. In addition, they may contain 20 to 95 wt. % styrene, more normally 45 to 90 wt. % styrene and especially 65 to 85 wt. % styrene. Moreover, in these polymers, the ratio of styrene to butadiene is typically in the range of 10/1 to 1/1, more usually 7/1 to 1.5/1, and even more typically 6/1 to 2/1.
  • [0011]
    In addition to styrene and butadiene, the styrene butadiene polymers of the present invention also include an ionic monomer. By “ionic monomer” is meant a monomer which addition polymerizes to form a homopolymerwhich is water soluble when having a molecular weight of 5000. In other words, if a 5000 molecular weight homopolymer formed by addition polymerizing a monomer is water soluble, that monomer is “ionic” in the context of this invention. Examples of suitable ionic monomers are 2-acrylamido-2-methyl propanesulfonic acid salt, styrene sulfate salt, styrene sulfonate salt, allyl sulfonate salt, 3-sulfopropyl acrylate salt, 3-sulfopropyl methacrylate salt, 2-sulfoethyl acrylate salt, 2-sulfoethyl methacrylate salt, maleic acid, itaconic acid and salts of maleic acid and itaconic acid. The cations of these salt are normally sodium, potassium or ammonium, more typically sodium or potassium. 2-acrylamido-2-methyl propanesulfonic acid salt is the preferred ionic monomer, with sodium 2-acrylamido-2-methyl propanesulfonic acid salt being especially preferred. 2-acrylamido-2-methyl propanesulfonic acid is known in industry as “AMPS,” which is a trademark of The Lubrizol Company.
  • [0012]
    The amount of ionic monomer in the styrene butadiene polymers of the invention can vary widely. As little as about 0.25 wt. % to as much as about 20 wt. %, based on the weight of the polymer, are effective. Typically, the polymers will contain about 0.5 to 10, more often about 1 to 5 wt. %, ionic monomer based on the weight of the polymer.
  • [0013]
    In addition to styrene, butadiene and the ionic monomer, the polymers of the invention may also include 0.25 to 20 wt. % of hydroxyethyl acrylate, hydroxyethyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide and/or methacrylamide. These “hydrophilic adjunct comonomers” have been found to enhance the effect of the ionic monomers in that the overall stability against divalent ions exhibited by a polymer including an ionic monomer as well as a hydrophilic adjunct comonomer is greater than would have been predicted by the rule of mixtures. A hydrophilic adjunct comonomer content of 0.5 to 10 wt. %, or even 1 to 4 wt. %, is more typical.
  • [0014]
    In addition to the foregoing monomers, the styrene butadiene polymers of the present invention may also include other addition monomers. Examples are isoprene, chloroprene, alpha-methylstyrene, 4-methylstyrene, 4-tert-butylstyrene, 4-ethylstyrene, divinylbenzene, vinylidene chloride, 2-vinylpyridene, 4-vinylpyridene and especially acrylic acid, methacrylic acid and their derivatives such as metal and ammonium salts, substituted and unsubstituted amides (other than acrylamide which is an hydrophilic adjunct comonomer), nitriles, and C1 to C12 esters. In such cases, the polymer should contain no more than about 30 wt. %, more typically no more than 15 wt. %, other addition monomer.
  • [0015]
    Styrene butadiene polymer latexes are typically made by aqueous emulsion polymerization. In carrying out such processes, the monomers forming the polymer are emulsified in water using suitable surfactants, usually anionic or non-ionic. Other ingredients such as free-radical initiators, chelating agents, chain transfer agents, biocides, defoamers and antioxidants can also be added. Once the free-radical initiator is activated, the monomers polymerize together producing the product polymer. As is well known, the arrangement of multiple monomers in a product polymer can be determined, at least to some degree, by controlling the manner which the monomers are added to the system. If all the monomers are added at the same time, the product polymer will have a more random distribution of monomers. If added in stages, the polymer will have a more ordered distribution of monomers.
  • [0016]
    A typical polymer latex produced by emulsion polymerization contains enough surfactants and other ingredients to prevent the product polymer from separating out from the water phase upon standing. However, these surfactants and other ingredients are usually insufficient to prevent coagulation or flocculation of the polymer if the latex is contaminated with significant amounts of divalent or trivalent ions. Therefore, such latexes can be expected to coagulate or flocculate prematurely if contacted with gypsum slurries used in the manufacture of gypsum wallboard, since such slurries contain significant concentrations of calcium ions, which are divalent.
  • [0017]
    In order to avoid this problem, additional surfactants can be incorporated into the latexes to keep them stable against calcium ions. However, gypsum slurries already contain significant concentrations of particular types of surfactants and other ingredients to enable the slurries to be frothed (foamed) during manufacture. Accordingly, it is desirable to avoid adding still additional surfactants to these systems, since different surfactant packages can interact with one another and thereby become ineffective.
  • [0018]
    In accordance with the present invention, therefore, the styrene butadiene latex includes a significant amount of a monomer, the ionic monomer, which imparts its own surface active properties to the polymer. As a result, additional surfactants for imparting calcium ion stability to a latex of the polymer can be reduced or even eliminated entirely. Therefore, when such latexes are added to gypsum slurries in the manufacture of gypsum wallboard, problems occurring from mixing incompatible surfactant packages can be avoided.
  • [0019]
    Styrene butadiene latexes which are especially useful in accordance with the present invention are described in commonly-assigned application Ser. No. 09/237,512, filed Jan. 26, 1999, now U.S. patent Ser. No. ______ (atty docket no. GT-5100), the disclosure of which is incorporated herein by reference. In general, these latexes are formed by emulsion polymerization of styrene and butadiene in the presence of an in situ seed polymer composed of polymerized styrene and an AMPS salt, preferably Na-AMPS. Normally, the seed polymer is made by emulsion polymerization of styrene and Na-AMPS only, although butadiene may be included as an additional comonomer if desired. These latexes have been designed for mixing with cement used for cementing oil wells and are particularly stable against divalent ions. The conditions encountered in gypsum slurries are less severe than those in oil well cementing, and so less ionic monomer may be acceptable when these polymers are used in the present invention as compared to oil well cementing applications.
  • [0020]
    Styrene butadiene latexes of particular utility in accordance with the present invention are formed by emulsion polymerizing the monomers identified in the following Table 1 in accordance with the general procedure described in the above-noted U.S. patent Ser. No. ______ (application Ser. No. 09/237,512, filed Jan. 26, 1999, atty docket no. GT-5100):
    TABLE 1
    Components of Styrene Butadiene Polymers, wt. %
    Example NaAMPS Styrene Butadiene HEA1 Acrylo2 Results
    1 2.5 77.5 15 3
    2 2.5 67.5 15 3 10
    3 5.5 67.2 26 1.3

    1Hydroxyethyl acrylate

    2Acrylonitrile
  • [0021]
    The amount of styrene butadiene latex that should be incorporated into a gypsum slurry in accordance with the present invention can vary widely, and essentially any amount can be used. From a practical standpoint, the amount of latex should be enough so that a noticeable decrease in density of product gypsum wallboard can be achieved without sacrificing strength but not so much that the product wallboard product becomes economically unattractive. In general, this means that the amount of latex added should be enough so that the styrene butadiene polymer is present in the product composition is about 0.1 to 10 wt. %, based on the weight of calcium sulfate hemihydrate in the composition. More typically, the amount of styrene butadiene polymer in the composition is 0.25 to 5 wt. %, and especially 0.5 to 1.5 wt. %, based on the weight of calcium sulfate hemihydrate in the composition.
  • [0022]
    Gypsum slurries for manufacture of wallboard typically contain various additional ingredients, as well known to those skilled in the art. Examples of such ingredients are accelerators, starch, retarders, paper pulp and so forth. See the above-noted Burke et al. patent, U.S. Pat. No. 5,879,825, especially Table I. Such components can also be included in the compositions produced in accordance with the present invention.
  • [0023]
    The gypsum-containing compositions of the present invention are used in the same way as conventional gypsum slurries to manufacture gypsum wallboard product. That is, they are deposited between large sheets of paper or other material and allowed the dry whereby the calcium sulfate hemihydrate in the system rehydrates into the dihydrate, i.e. gypsum, thereby forming the completed wallboard product. In commercial practice, the process is carried out in high volume using machines having traveling webs which rapidly move the incipiently-formed product through ovens under precisely controlled heating conditions for removing exactly the right amount of water. In this environment, it is desirable that the amount of water in the starting gypsum slurry be controlled so that the wallboard product is dried to the right amount when it leaves the oven.
  • [0024]
    To this end, conventional gypsum slurries for making wallboard typically contain about 40 to 60 wt. %, more typically about 48 to 55 wt. % calcium sulfate hemihydrate and less than 60 wt. %, more typically less than 50 wt. % water, based on the weight of the composition. See Table I of the above-noted Burke et. al. patent. The gypsum slurries of the present invention may also contain the same amounts of calcium sulfate hemihydrate and water, especially when intended for use in making gypsum wallboard in modern high speed equipment.
  • [0025]
    In this connection, it should be appreciated that the amount of water which a styrene butadiene styrene butadiene latex adds to a gypsum slurry in accordance with the present invention is essentially trivial when making wallboard product under normal practice. This is because the amount of latex added will typically be small, e.g. 5 wt. % or less, and the amount of water in this latex will usually be less than 50 wt. %. Also, less gypsum slurry is needed to make a wallboard product of a given dimension, since its density is less, and hence less water derived from the gypsum slurry is present in the inventive gypsum slurries in the first place. This means that the net effect of including a styrene butadiene latex in a gypsum slurry in accordance with the present invention may actually be to reduce the overall water content of the slurry by a slight amount for a wallboard product of a given dimension. In any event, those skilled in the art can readily determine by routine experimentation the precise amount of calcium sulfate hemihydrate and water to include in a particular embodiment of the inventive gypsum slurries in order that it can be used without problem in making gypsum wallboard in modern high speed equipment.
  • [0026]
    It should also be appreciated that the gypsum slurries of the present invention can be used in applications other than in making gypsum wallboard. For example, the inventive gypsum slurries can also be used in making molding plasters. In these applications, more or less water than indicated above can be included in the composition depending on the particular application desired. Indeed, the only real upper limit on the water content of the inventive gypsum slurry is that too much water may make its viscosity too low for practical application or may cause water to separate out. Similarly, the only real lower limit on the water content is stoichiometric—that is, enough water should be present to allow substantially complete hydration of the calcium sulfate hemihydrate to the dihydrate form. Within these broad limits, those skilled in the art can readily determine by routine experimentation the precise amount of water to use in a particular application.
  • [0027]
    Although only a few embodiments of the present invention have been described above, it should be appreciated that many modifications can be made without departing from the spirit and scope of the invention. All such modifications are intended to be included within the scope of the present invention, which is to be limited only by the following claims.
Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US3043790 *20 Sep 195710 Jul 1962Du PontButadiene-styrene copolymer-cement composition and method of preparation
US3852083 *22 Sep 19723 Dic 1974Yang JManufacture of plaster of paris products containing latex
US3869415 *14 Ago 19734 Mar 1975Temec LimitedResinous polymer containing waterproofing plaster compositions
US3895018 *20 Jul 197015 Jul 1975Adolf JohnPlaster composition
US3895953 *11 Ene 197422 Jul 1975Univ CaliforniaAdmixtures for reducing slump loss in hydraulic cement concretes
US3936408 *1 May 19743 Feb 1976Calgon CorporationWell cementing composition having improved flow properties containing a polyamido-sulfonic additive
US3943996 *27 Jun 197516 Mar 1976Calgon CorporationLow fluid loss cementing compositions
US4002713 *7 Oct 197411 Ene 1977Imperial Chemical Industries LimitedCementing compositions and concretes and mortars derived therefrom
US4015991 *10 May 19765 Abr 1977Calgon CorporationLow fluid loss cementing compositions containing hydrolyzed acrylamide/2-acrylamido-2-methylpropane sulfonic acid derivative copolymers and their use
US4042409 *1 Abr 197616 Ago 1977Mitsubishi Chemical Industries LimitedWater repellent gypsum composition
US4051291 *23 Jul 197427 Sep 1977United States Gypsum CompanyGypsum wallboard
US4057662 *12 Feb 19768 Nov 1977National Gypsum CompanyBlock-resistant gypsum board
US4066201 *10 Nov 19763 Ene 1978Richard BleckmannMethod of joining metal parts
US4151150 *27 Dic 197724 Abr 1979The Dow Chemical CompanyStyrene-butadiene interpolymer latex based cement additives containing a silane
US4202809 *16 Jun 197813 May 1980The Dow Chemical CompanyStyrene-butadiene-acrylonitrile interpolymer latex based cement additives
US4265964 *26 Dic 19795 May 1981Arco Polymers, Inc.Lightweight frothed gypsum structural units
US4272426 *29 Feb 19809 Jun 1981The International Synthetic Rubber Company Ltd.Preparation of latices
US4448923 *17 Mar 198315 May 1984Rhone Poulenc Specialites ChimiquesInterpolymer latex, process for its preparation and use of the latex for coating paper
US4478974 *4 Ago 198323 Oct 1984The Dow Chemical CompanyHeterogeneous polymer latex of relatively hard and relatively soft interpolymers of a monovinylidene aromatic monomer and an aliphatic conjugated diene monomer
US4480078 *27 Ene 198430 Oct 1984The Goodyear Tire & Rubber CompanyContinuous emulsion polymerization process
US4537918 *30 Mar 198327 Ago 1985Etudes Et Fabrication Dowell SchlumbergerCement compositions for cementing wells, allowing pressure gas-channeling in the cemented annulus to be controlled
US4542185 *22 Jun 198417 Sep 1985M&T Chemicals Inc.Graft copolymers of alkyl methacrylates--alkyl acrylates onto diene--alkyl acrylate copolymers and their use as impact modifiers
US4613633 *26 Feb 198523 Sep 1986Nippon Zeon Co., Ltd.Copolymer latex
US4657966 *13 Jun 198514 Abr 1987Polysar LimitedCarboxylated latex
US4659773 *23 Ago 198521 Abr 1987Mitsui Toatsu Chemicals, IncorporatedProcess for preparing amidoalkanesulfonic acids polymers
US4700780 *27 Mar 198720 Oct 1987Halliburton ServicesMethod of reducing fluid loss in cement compositions which may contain substantial salt concentrations
US4721160 *19 Ago 198526 Ene 1988Dowell Schlumberger IncorporatedComposition for a lightweight cement slurry for cementing oil and gas wells
US4735907 *18 Mar 19855 Abr 1988Eastman Kodak CompanyStabilized fluorescent rare earth labels and labeled physiologically reactive species
US4752538 *20 Nov 198621 Jun 1988United States Gypsum CompanyMethod for forming a lightweight cementitious structural product and a product formed thereby
US4767460 *17 Ene 198630 Ago 1988Dowell Schlumberger IncorporatedCement compositions for cementing of wells enabling gas channelling in the cemented annulus to be inhibited by right-angle setting
US4780503 *20 Ago 198625 Oct 1988Polysar LimitedCarboxylated latex
US4791161 *27 May 198613 Dic 1988Rhone-Poulenc Specialites ChimiquesCationic latices of copolymers based on conjugated dienes
US4791162 *17 Dic 198413 Dic 1988Lehigh UniversityPreparation of large particle size monodisperse latexes
US4806164 *27 Mar 198721 Feb 1989Halliburton CompanyMethod of reducing fluid loss in cement compositions
US4894397 *21 Abr 198816 Ene 1990S. C. Johnson & Son, Inc.Stable emulsion polymers and methods of preparing same
US4972032 *19 Jul 198920 Nov 1990The Dow Chemical CompanyProcess for preparing copolymers of alpha-methylstyrene and acrylonitrile
US4988390 *17 Abr 199029 Ene 1991Osaka Yuki Kagaku Kogyo Kabushiki KaishaMethod for production of inclusion water for hardening gypsum, method for production of shaped article of gypsum, and shaped article of gypsum
US5026576 *16 Nov 198925 Jun 1991Benvenuto Francis SMethod and composition for finishing structural building surfaces
US5039764 *31 Mar 198913 Ago 1991Union Oil Company Of CaliforniaProcess for preparing carboxylated copolymers
US5075358 *3 Ene 199024 Dic 1991Victor RileyMultiple purpose patching composition
US5081166 *2 Nov 199014 Ene 1992S. C. Johnson & Son, Inc.Process for producing a stabilized latex emulsion adhesive
US5099922 *26 Mar 199131 Mar 1992The Western Company Of North AmericaControl of gas flow through cement column
US5155315 *12 Mar 199113 Oct 1992Merlin GerinHybrid medium voltage circuit breaker
US5171768 *21 Oct 199115 Dic 1992The Goodyear Tire & Rubber CompanyProcess for the production of carboxylated latexes by the selective monomer addition and polymerization
US5177153 *10 Jun 19925 Ene 1993Xerox CorporationSuspension polymerization process for the preparation of polymeric material from gaseous and non-gaseous monomers
US5191008 *21 Oct 19912 Mar 1993The Goodyear Tire & Rubber CompanyProcess for the production of latexes by the selective monomer addition
US5191009 *20 Sep 19902 Mar 1993The Goodyear Tire & Rubber CompanyProcess for producing stable latex
US5198492 *28 Sep 199030 Mar 1993Rohn And Haas CompanyLow viscosity, fast curing binder for cellulose
US5216065 *29 Nov 19901 Jun 1993The Mead CorporationEmulsion polymerization with large particle size
US5225474 *18 Ago 19926 Jul 1993Isp Investments Inc.Emulsion polymerization composition
US5250153 *29 Oct 19905 Oct 1993Usg Interiors, Inc.Method for manufacturing a mineral wool panel
US5258428 *4 Sep 19922 Nov 1993Sridhar GopalkrishnanAdditive composition for oil well cementing formulations
US5274027 *26 Dic 199128 Dic 1993The Dow Chemical CompanyMonovinylidene aromatic and conjugated diene copolymer coating compositions comprising sulfoalkyl monomeric emulsifier
US5286779 *10 Mar 199315 Feb 1994Isp Investments Inc.Emulsion polymerization composition
US5294659 *21 Dic 198915 Mar 1994General Electric CompanyMethod for preparing emulsion polymerized polybutadiene of increased particle size
US5302655 *26 Dic 199112 Abr 1994The Dow Chemical CompanyMonovinylidene aromatic and conjugated diene copolymer coating compositions comprising sulfoalkyl monomeric emulsifier
US5331035 *22 Dic 199219 Jul 1994Bridgestone CorporationProcess for the preparation of in situ dispersion of copolymers
US5340392 *24 Abr 199223 Ago 1994Franklin Industries, Inc.Method and product of calcium sulfate dihydrate as filler in aqueous polymer dispersions
US5342875 *7 Abr 199330 Ago 1994The Procter & Gamble CompanyPolycationic latex wet strength agent
US5354800 *28 Oct 199211 Oct 1994Takeda Chemical Industries, Ltd.Production of copolymer latices
US5514758 *30 Sep 19947 May 1996The Goodyear Tire & Rubber CompanyProcess for making latex for high performance masking tape
US5569324 *2 Jun 199529 Oct 1996Halliburton CompanyCementitious compositions
US5583173 *10 Abr 199510 Dic 1996The Goodyear Tire & Rubber CompanyProcess for preparing styrene-butadiene rubber
US5588488 *22 Ago 199531 Dic 1996Halliburton CompanyCementing multi-lateral wells
US5631312 *21 May 199620 May 1997Kikusui Chemical Industries Co., Ltd.Floor paint composition
US5663231 *26 Dic 19952 Sep 1997The Goodyear Tire & Rubber CompanyLatex for high performance masking tape
US5688844 *1 Jul 199618 Nov 1997Halliburton CompanyResilient well cement compositions and methods
US5725656 *29 May 199610 Mar 1998The Trustees Of Colombia University In The City Of New YorkGypsum composition
US5726259 *12 Jul 199610 Mar 1998Gencorp Inc.Bimodal latex binder
US5741539 *18 Mar 199621 Abr 1998Knipper; Aloysius J.Shelf-stable liquid egg
US5750618 *25 Feb 199712 May 1998Bayer AgProcess for the production of latices based on conjugated dienes by emulsion polymerisation
US5756573 *5 Oct 199526 May 1998Sc Johnson Commerical Markets, Inc.Seed polymerized latex polymer having a gradient polymeric morphology and process for preparing the same
US5770303 *5 Ene 199623 Jun 1998Gencorp Inc.Occluded composite-particle latex
US5837762 *8 Jul 199417 Nov 1998The Dow Chemical CompanyLatex-based coating composition
US5872200 *31 Jul 199716 Feb 1999Gencorp Inc.Latex binder for paper coating formulations having improved strength and blister resistance
US5879825 *7 Ene 19979 Mar 1999National Gypsum CompanyGypsum wallboard and method of making same
US5891947 *18 Oct 19936 Abr 1999Bridgestone CorporationIn-situ anionic continuous dispersion polymerization process
US5962178 *9 Ene 19985 Oct 1999Xerox CorporationSediment free toner processes
US5969032 *9 Mar 199819 Oct 1999National Starch And Chemical Investment Holding CorporationLatex binders for coatings incorporating a polymerizable surfactant having a terminal allyl amine moiety
US6001922 *15 Ago 199714 Dic 1999Eastman Chemical CompanySmall particle size polyester/acrylic hybrid latexes
US6028135 *17 Jun 199722 Feb 2000Basf AktiengesellschaftPreparation of aqueous polymer dispersions of low viscosity with polymer volume concentrations of at least 50%
US6103802 *18 Ago 199815 Ago 2000Westvaco CorporationWater-based release coatings
US6171388 *11 Mar 19999 Ene 2001Rhodia Inc.Lightweight gypsum composition
US6184287 *26 Ene 19996 Feb 2001Omnova Solutions Inc.Polymeric latexes prepared in the presence of 2-acrylamido-2-methylpropanesulfonate
US6291573 *14 Dic 199818 Sep 2001Basf AktiengesellschaftPreparation of polymer powders
USRE29595 *20 Abr 197728 Mar 1978Calgon CorporationWell cementing composition having improved flow properties containing a polyamido-sulfonic additive
Clasificaciones
Clasificación de EE.UU.524/423, 524/571, 524/556
Clasificación internacionalC08F2/00, C08L51/00, C08F2/24, C08F2/22, C08L9/10, E21B33/14, C04B24/16, C08F257/02, C08F291/00, C09K8/46, C04B24/26, E04C2/04, C04B28/14
Clasificación cooperativaY10S525/902, Y10S526/923, C04B24/2688, C04B2111/0062, C04B24/163, C09K8/46, E04C2/043, C04B2103/0062, C04B24/2676, C08F257/02, C08F291/00, C04B28/145, C04B2103/0063
Clasificación europeaC04B28/14H, C08F257/02, C08F291/00, C09K8/46, E04C2/04C, C04B24/26S, C04B24/26V, C04B24/16P2
Eventos legales
FechaCódigoEventoDescripción
30 May 2007ASAssignment
Owner name: JPMORGAN CHASE BANK, N.A., ILLINOIS
Free format text: SECURITY AGREEMENT;ASSIGNOR:OMNOVA SOLUTIONS INC.;REEL/FRAME:019353/0566
Effective date: 20070522
Owner name: JPMORGAN CHASE BANK, N.A.,ILLINOIS
Free format text: SECURITY AGREEMENT;ASSIGNOR:OMNOVA SOLUTIONS INC.;REEL/FRAME:019353/0566
Effective date: 20070522
24 Jul 2007ASAssignment
Owner name: DEUTSCHE BANK TRUST COMPANY AMERICAS, AS COLLATERA
Free format text: GRANT OF SECURITY INTEREST IN CERTAIN PATENTS AND TRADEMARKS;ASSIGNOR:OMNOVA SOLUTIONS INC.;REEL/FRAME:019597/0227
Effective date: 20070522