Ethylenic Reactant Contains At Least Two Unsaturated Groups And Is Devoid Of An Aromatic Group Patents (Class 525/313)
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Patent number: 5210132Abstract: A process for preparing rubber modified high impact resins by dissolving a rubbery polymer in a monomer containing an aromatic vinyl monomer or a mixture of an aromatic vinyl monomer and a vinyl cyanide monomer followed by polymerizing the monomer, the two steps being carried out in at least two polymerization reactors with a particle disperser placed between the first and second reactors. High impact resins having excellent surface properties are obtained with a savings in a power consumption by controlling:(1) the relationship between the concentration of the polymerized monomer and the content of the rubbery polymer in the first reactor;(2) the relationship between the volume occupied by the polymerizing liquid in the first reactor and the inner volume of the particle disperser; and(3) the peripheral linear velocity of a shearing stirrer in the particle disperser.Type: GrantFiled: October 14, 1992Date of Patent: May 11, 1993Assignee: Mitsui Toatsu Chemicals, Inc.Inventors: Tetsuyuki Matsubara, Norifumi Ito, Mune Iwamoto, Kazuo Sugazaki, Toshihiko Ando, Yasuo Furuta, Kouzo Ichikawa, Hitoshi Ozawa
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Patent number: 5200469Abstract: A crosslinked, unsaturated elastomeric polymer of a C.sub.4 to C.sub.7 isomonoolefin and a C.sub.4 to C.sub.14 conjugated multiolefin is produced by curing the corresponding uncrosslinked polymer having a low level of chemically bound halogen with a curing agent which reacts only with the halogen (e.g., zinc oxide) in combination with a bifunctional dienophile (e.g., a bismaleimide). The uncrosslinked elastomeric polymer is particularly suitable for use in the pharmaceutical industry, for example, for container closures. Shaped rubbery products comprising the crosslinked copolymer are also provided.Type: GrantFiled: April 18, 1990Date of Patent: April 6, 1993Assignee: Exxon Chemical Patents Inc.Inventor: Pierre Hous
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Patent number: 5198500Abstract: Disclosed is an improved process of the post-emulsion method capable of forming crosslinked resin particles which do not have fusion bonds between particles and which have good storage stability and good redispersibility in an aqueous medium. The process comprises (a) dispersing in an aqueous medium a resinous component comprising (I) a base resin having a glass transition temperature (Tg) of 0.degree. C. or less and a polymerizable double bond, (II) a monomer which, when polymerized, provides a resin of which Tg is 20.degree. C. higher than that of said base resin, or a resin of which Tg is 20.degree. C. higher than that of the base resin, and (III) a polyvinyl compound; (b) crosslinking inside the dispersed resin particles and; (c) removing the aqueous medium therefrom.Type: GrantFiled: January 15, 1991Date of Patent: March 30, 1993Assignee: Nippon Paint Co., Ltd.Inventors: Hisaichi Muramoto, Yusuke Ninomiya, Keizou Ishii, Shinichi Ishikura
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Patent number: 5189109Abstract: A process for preparing modified diene polymer rubbers having an increased impact resilience and a reduced hardness at low temperatures and useful as rubber materials for automobile tires and other industries which comprises producing an alkali metal-containing conjugated diene polymer, and reacting the akali metal-containing polymer with an acrylamide modifier compound of the formula: ##STR1## wherein R.sup.1 is hydrogen atom or methyl group, R.sup.2 and R.sup.3 are independently an alkyl group and n is an integer said alkali metal-containing diene polymer being prepared by a living anionic polymerization using an alkali metal-based catalyst or by an addition reaction of a diene polymer having conjugated diene units and an alkali metal-based catalyst in a hydrocarbon solvent.Type: GrantFiled: March 23, 1992Date of Patent: February 23, 1993Assignee: Sumitomo Chemical Company, LimitedInventors: Akio Imai, Tomoaki Seki
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Patent number: 5189107Abstract: Polymer particles prepared by polymerizing polymerizable monomers by seed polymerization, with far more excellent polymerization stability than conventional seed polymerization processes, in the presence of a polymer emulsion comprising low molecular weight polymer particles, radically polymerizable in an aqueous system. The polymer particles are present in an amount of 0.5-30 parts by weight (on solid basis) per 100 parts by weight of polymerizable monomers, have a weight average molecular weight of 500-10,000 and are prepared by emulsion polymerization or soap-free polymerization. The seed polymerization is carried out by initially charging less than 30% by weight of said polymerizable monomers to the polymerization mixture, and after the polymerization conditions are established, by continuously or intermittently adding the remaining portion of said polymerizable monomers to the reaction system.Type: GrantFiled: March 6, 1990Date of Patent: February 23, 1993Assignee: Japan Synthetic Rubber Co., Ltd.Inventors: Kiyoshi Kasai, Fujio Sakurai, Hiroshi Tadenuma
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Patent number: 5185387Abstract: An aqueous synthetic resin dispersion having a minimum film forming temperature below 50.degree. C., containing an emulsion polymer having a core/shell structure consisting ofA) 65-90 percent by weight of a weakly crosslinked core polymer having a glass transition temperature, T.sub.g, below 0.degree. C. and an extensibility of at least 150 percent, andB) 10-35 percent by weight of an essentially non-crosslinked shell polymer having a T.sub.g below 60.degree. C. the T.sub.g of the core polymer being at least 10 Centigrade degrees below that of the shell polymer.Type: GrantFiled: September 16, 1991Date of Patent: February 9, 1993Assignee: Rohm GmbHInventors: Wolfgang Klesse, Wilhelm Elser, Theodor Mager, Juergen Christner, Hertha Kraus, Peter Rossberg, Marliese Weber
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Patent number: 5183858Abstract: This invention relates to a core-shell polymer which is useful for polyoxymethylene resin, a polyoxymethylene resin composition containing the core-shell polymer and a molded article made of the polyoxymethylene resin composition.The core-shell polymer comprises a rubbery polymer core and a glassy polymer shell and has substantially no detectable anion.This core-shell polymer makes the molded articles be improved on the impact strength, elongation at the weld line, etc. The molded articles is used as various products (such as gears, reels, etc.).Type: GrantFiled: December 19, 1991Date of Patent: February 2, 1993Assignee: Takeda Chemical Industries, Ltd.Inventors: Ichiro Sasaki, Junji Oshima, Minoru Yamada
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Patent number: 5182333Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.Type: GrantFiled: November 12, 1991Date of Patent: January 26, 1993Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang, Debra C. Handy, James V. Fusco
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Patent number: 5177153Abstract: A suspension polymerization process for the preparation of a polymeric material formed from at least two monomers, a non-gaseous monomer and a gaseous monomer. The composition of the beads or particles of the polymeric material is controlled by adding gaseous monomer to the vapor phase after polymerization of about 5% to about 90% by weight of the non-gaseous monomer or by removing a portion or substantially all of the gaseous monomer in the vapor phase before polymerization of about 70% by weight of the gaseous monomer in the aqueous suspension, or a combination thereof.Type: GrantFiled: June 10, 1992Date of Patent: January 5, 1993Assignee: Xerox CorporationInventors: George Liebermann, William J. Dale, Nam S. Ro, Daniel M. McNeil, Stephan Drappel
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Patent number: 5147937Abstract: Uniformly sized polymer particles of 1-50 .mu.m diameter are made by gradually combining a water-insoluble monomer mixture with an aqueous dispersion of emulsion-polymerized polymer particles in the presence of a dispersion stabilizer and an oil-soluble, free-radical polymerization initiator.Type: GrantFiled: March 1, 1991Date of Patent: September 15, 1992Assignee: Rohm and Haas CompanyInventors: Mark S. Frazza, Kim S. Ho, Alexander Kowalski, Robert R. Raney, Martin Vogel
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Patent number: 5145669Abstract: What is provided herein is a sunscreen composition consisting essentially of a crosslinked, neutralized terpolymer of maleic anhydride, a C.sub.1 -C.sub.5 alkyl vinyl ether and a C.sub.12 -C.sub.14 alpha-olefin monomer as a thickener; water; an ultraviolet sunscreening agent; and an emulsifier. In the preferred form of the invention, the monomers are present in a molar ratio of about 1:0.90-0.99:0.01-0.10, respectively, and are crosslinked with about 2-8 wt. % of a crosslinking agent based on the total weight of the monomers. Suitably, the crosslinked terpolymer is neutralized to increase water solubility.Type: GrantFiled: July 19, 1991Date of Patent: September 8, 1992Assignee: ISP Investments Inc.Inventors: Yoon T, Kwak, Stephen L. Kopolow, Michael W. Helioff, Mohammed Tazi
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Patent number: 5140074Abstract: Disclosed is a method of making graft copolymers of olefin polymers by contacting a particulate olefin polymer with a free radical polymeriztion initiator, e.g., a peroxide, and a vinyl monomer at about from 60.degree. to 125.degree. C., while controlling the monomer addition rate so that it does not exceed about 4.5 pph/min, and most preferably does not exceed about 3.0 pph/min, at any monomer feed level. To prevent polymer degradation, a non-oxidizing environment is maintained throughout the process, and residual free radicals are deactivated, and unreacted initiator is decomposed, before the graft copolymer is exposed to air.Type: GrantFiled: December 10, 1990Date of Patent: August 18, 1992Assignee: Himont IncorporatedInventors: Anthony J. DeNicola, Jr., Suhas Guhaniyogi
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Patent number: 5137976Abstract: A reinforcing agent for vulcanizable rubber compounds comprises an anhydrous metal salt of an .alpha.,.beta.-ethylenically unsaturated carboxylic acid having a crystalline structure consisting essentially of plates and fibers. Vulcanizable rubber compounds containing such reinforcing agents have improved physical properties over rubber compounds containing conventional metal carboxylic acid salts. Methods for the preparation of such anhydrous metal salts and methods for the reinforcement of vulcanizable rubber compounds therewith are also provided.Type: GrantFiled: December 3, 1991Date of Patent: August 11, 1992Assignee: Bridgestone/Firestone, Inc.Inventors: Arthur E. Oberster, Takatsugu Hashimoto
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Patent number: 5132371Abstract: A methacrylimide-containing polymer comprising a polymer (A) comprised of 5-100 weight % of units represented by the formula (I): ##STR1## wherein R is H or C1-20 hydrocarbon group, and 0-95 weight % of units derived from an ethylenic monomer, wherein a polymer derived from at least one ethylenic monomer has been grafted onto the polymer (A). The methacrylimide-containing polymer is used as a blend with another thermoplastic polymer.Type: GrantFiled: December 11, 1989Date of Patent: July 21, 1992Assignee: Mitsubishi Rayon Company Ltd.Inventors: Isao Sasaki, Kozi Nishida, Masaharu Fujimoto
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Patent number: 5071913Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.Type: GrantFiled: December 11, 1987Date of Patent: December 10, 1991Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang, Debra C. Handy, James V. Fusco
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Patent number: 5017635Abstract: A novel kneaded moldable resin composition and the molding produced therefrom are described. The composition comprises an ethylene polymer, an organopolysiloxane, and a hydrocarbon compound expressed by the formula CH.sub.2 .dbd.CH(CH.sub.2).sub.1-30 CH.dbd.CH.sub.2 and is moldable into films, sheets, tubes, and a variety of plastic parts.Type: GrantFiled: June 6, 1990Date of Patent: May 21, 1991Assignee: Union Carbide Chemicals and Plastics Company Inc.Inventors: Akitaka Senuma, Kiroku Tsukada, Isao Noda
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Patent number: 4994520Abstract: A carbon black-graft polymer, produced by causing a polymer possessing within the molecular unit thereof at least one reactive group selected from the class consisting of aziridine group, oxazoline group. N-hydroxyalkylamide group, epoxy group, and thioepoxy group to react with carbon black. The polymer can be used as a toner for electrostatically charged image, resin composition, coating composition, ink for thermographic transfer, coating agent for magnetic recording medium, rubber composition, and carbon black dispersion and the like.Type: GrantFiled: June 6, 1990Date of Patent: February 19, 1991Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.Inventors: Yoshikuni Mori, Mitsuo Kushino, Hayato Ideda, Nobuaki Urashima, Masuji Izubayashi, Shigeru Tanimori, Yoshihiro Arita, Kiyoshi Kawamura, Kenji Minami, Yoshinori Sano
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Patent number: 4990572Abstract: Composite resin particles each comprising a particulate crosslinked polymer to which a number of substantially linear, metal-containing polymer chains are chemically bonded. The invention also provide methods for the preparation of said composite resin particles. The present composite resin particles have self-film forming properties, can give a stable dispersion in an organic solvent or a resinous varnish and are specifically useful in paint industries. The particles are further characterized by having the desired properties of the metal element contained therein, as, for example, self-catalytic function in crosslinking, excellent biological activities and the like.Type: GrantFiled: March 13, 1989Date of Patent: February 5, 1991Assignee: Nippon Paint Co., Ltd.Inventors: Tadafumi Miyazono, Akio Kashihara, Shinichi Ishikura
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Patent number: 4990571Abstract: Composite resin particles each comprising a particulate crosslinked polymer to which a number of substantially linear, metal-containing polymer chains are chemically bonded. The invention also provide methods for the preparation of said composite resin particles. The present composite resin particles have self-film forming properties, can give a stable dispersion in an organic solvent or a resinous varnish and are specifically useful in paint industries. The particles are further characterized by having the desired properties of the metal element contained therein, as, for example, self-catalytic function in crosslinking, excellent biological activities and the like.Type: GrantFiled: March 13, 1989Date of Patent: February 5, 1991Assignee: Nippon Paint Co., Ltd.Inventors: Tadafumi Miyazono, Akio Kashihara, Shinichi Ishikura
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Patent number: 4987193Abstract: An unsaturated copolymer of propylene and the branched diene which is 6-methyl-1,6-octadiene and/or 7-methyl-1,6-octadiene, and optionally, ethylene is produced by a two-step process wherein in a first polymerization step homopolymerization of propylene is conducted until the propylene polymer amounts to 0.01 to 10% by weight of the total and final copolymer, and in a second polymerization step the random copolymerization of propylene, 6-methyl-1,6-octadiene and/or 7-methyl-1,6-octadiene, and optionally, ethylene is then conducted as a continuation of the first step polymerization, whereby a copolymer of a specified characteristics is produced.Type: GrantFiled: May 18, 1990Date of Patent: January 22, 1991Assignee: Mitsubishi Petrochemical Company LimitedInventor: Shiroh Gotoh
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Patent number: 4983681Abstract: Colored microfine globular particles are produced by causing carbon black to react with a polymer capable of reacting with the carbon black thereby forming a carbon black-graft polymer, dispersing this carbon black-graft polymer in a polymerizable monomer component, and then polymerizing the polymerizable monomer component. These particles, in the unmodified form, are usable as a toner for the development of images of static charge and, in a form incorporated in a varying component, are usable such as in resin composition, coating composition, thermosensitive transfer ink ribbon coating agent, thermosensitive transfer ink, or back-coating agent for magnetic recording medium.Type: GrantFiled: December 22, 1989Date of Patent: January 8, 1991Assignee: Nippon Shokubai Kagaku Kogyo Kabushiki KaishaInventors: Yoshikuni Mori, Mitsuo Kushino, Hayato Ikeda, Nobuaki Urashima, Kenji Minami, Iwao Fukikawa
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Patent number: 4960829Abstract: Blends comprised of (A) a high molecular weight elastomeric polymer; (B) a sufficient amount of an ethylene/alphaolefin/nonconjugated polyene terpolymer having a number average molecular weight of between about 1,000 and about 15,000 such that the variety of the blend is at least about 5% lower than the viscosity of component (A) alone, and (c) a curative, exhibit increased processability, and, when cured, exhibit unexpectedly desirable tensile strength, ozone resistance and oil resistance.Type: GrantFiled: July 25, 1988Date of Patent: October 2, 1990Assignee: Uniroyal Chemical Company, Inc.Inventors: Ralph D. Allen, Seshan Thiruvengada, Frank C. Cesare, Harry D. Visser
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Patent number: 4945133Abstract: An oxidized halogenated polymer is prepared by a process comprising (a) forming an admixture of an acidic oxidizing agent and a suspension of a particulate halogenated polymer in a polar liquid; (b) heating the admixture to a temperature sufficient to initiate the reaction between the polymer and the oxidizing agent; and (c) continuing the reaction until an oxidized polymer having a preselected extent of oxidation is obtained. At least one addition polymerizable compound is, optionally, grafted to the oxidized halogenated polymer. The oxidized halogenated polymer and graft copolymers thereof have physical properties different from the halogenated polymer and graft copolymers thereof. Certain graft copolymers are non-caking or free flowing.Type: GrantFiled: November 22, 1988Date of Patent: July 31, 1990Assignee: The Dow Chemical CompanyInventors: Donald W. Pennington, Joseph L. Allison
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Patent number: 4935469Abstract: A process for producing monodispersed fine particles of a vinyl polymer is disclosed, which comprises polymerizing monomers containing at least one vinyl monomer selected from the group consisting of aromatic vinyl compounds, acrylic esters, and a methacrylic ester in the presence of (1) a surface active agent represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a substituted or unsubstituted alkyl group having from 4 to 8 carbon atoms, a substituted or unsubstituted phenyl group, or a substituted or unsubstituted cyclohexyl group and M represents an alkali metal, (2) from 10.sup.-3 to 10.sup.-1 mol/l of a persulfate as a polymerization initiator, and (3) from 10.sup.-4 to 10.sup.-2 mol/l of a divalent metal sulfate as an electrolyte. Monodispersed vinyl polymer fine particles having a particle size of 1 .mu.m or greater with a very narrow size distribution are obtained.Type: GrantFiled: February 3, 1988Date of Patent: June 19, 1990Assignee: Fuji Xerox Co., Ltd.Inventors: Yutaka Akasaki, Naoya Yabuuchi, Tatsuro Ohki
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Patent number: 4882389Abstract: A resin having a low dielectric constant obtained by heat-curing 100 parts by weight of a butadiene polymer containing in its polymer chain at least 50 mol% of a 1,2-butadiene unit having a double bond in its side chain and from 10 to 100 parts by weight of a vinyl compound having at least 3 vinyl groups in one molecule in the presence of an organic peroxide. Also disclosed is a resin having flame resistance obtained by heat-curing a blend of an organic peroxide with a composition comprising 100 parts by weight of a butadiene polymer containing in its polymer chain at least 50 mol% of a 1,2-butadiene unit having a double bond in its side chain, from 10 to 100 parts by weight of a vinyl compound having at least 3 vinyl groups in one molecule and at least one member selected from the compounds of the formulas I-IV: ##STR1## wherein X is H or CH.sub.3, Y is Br or Cl, A is --, --o--, --CO--, SO.sub.2, --CH.dbd.CH--, --C(CH.sub.3).sub.2 --or --(CH.sub.2 .sub.Type: GrantFiled: December 18, 1987Date of Patent: November 21, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Makoto Doi, Hiroyukio Nakajima, Fumiyuki Miyamoto, Seiji Oka, Mitsuhiro Nonogaki
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Patent number: 4876313Abstract: Improved core-shell polymers having an alkali-insoluble core and an alkali-soluble shell are prepared by emulsion polymerization of the core-shell polymers utilizing compounds which chemically graft the core and shell together. The core-shell polymers exhibit improved solvent stability, water resistance, heat resistance and rheology. The polymers are useful in application such as inks, coatings and varnishes, floor polishes, leather treatment, cement formulations, and as a seed for further emulsion polymerization.Type: GrantFiled: August 29, 1986Date of Patent: October 24, 1989Assignee: Rohm and Haas CompanyInventor: Dennis P. Lorah
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Patent number: 4859744Abstract: The invention relates to a process for the production of graft polymers of resin-forming monomers on a rubber in which a very high graft yield is obtained by the use of an initiator system of an organic hydroperoxie and ascorbic acid. The graft polymers obtained are suitable as thermoplastic molding compositions or as constituents thereof.Type: GrantFiled: March 7, 1988Date of Patent: August 22, 1989Assignee: Bayer AktiengesellschaftInventors: Christian Lindner, Karl-Heinz Ott
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Patent number: 4857631Abstract: The specification discloses a readily de-waterable modified rubber concentrate and method for forming same from a process including the preparation of a latex emulsion of the modified rubber concentrate, insuring that the emulsified modified rubber concentrate has a rubber content of from about 57 to about 88% by weight and freeze coagulating the modified rubber concentrate from the emulsion.Type: GrantFiled: November 6, 1987Date of Patent: August 15, 1989Assignee: The Dow Chemical CompanyInventor: Eugene R. Moore
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Patent number: 4853445Abstract: In the suspension polymerization of styrene monomers in water using suitable suspension stabilizers, the only modifier needed has been found to be organotin compounds in amounts from 10 to 1000 ppm based on monomer. The product beads have a narrow bead size distribution.Type: GrantFiled: May 21, 1987Date of Patent: August 1, 1989Assignee: Arco Chemical Technology, Inc.Inventors: Bernard H. Meyer, Joseph C. Kinslow, Paul E. Arch, D. Harper Meek
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Patent number: 4843120Abstract: It has been determined that certain rubbery polymers having multiple glass transition temperatures can be utilized in making tires which have improved rolling resistance, improved wet skid resistance, and outstanding tread wear. These rubbery polymers are derived from at least one conjugated diolefin monomer, have a first glass transition temperature which is between -110.degree. C. and -20.degree. C. and have a second glass transition temperature which is between -50.degree. C. and 0.degree. C. These rubber polymers can be homopolymers of conjugated diolefin monomers, copolymers of more than one conjugated diolefin monomer, or copolymers derived from at least one conjugated diolefin monomer and at least one vinyl aromatic monomer.Type: GrantFiled: September 29, 1986Date of Patent: June 27, 1989Assignee: The Goodyear Tire & Rubber CompanyInventors: Adel F. Halasa, Bill B. Gross, Joel L. Cox, George F. Balogh
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Patent number: 4806581Abstract: Graft polymers are prepared by reacting an ethylenically unsaturated polymerizable monomer with a polymer of an olefin of 2 to about 8 carbon atoms in a process wherein the olefin polymer is substantially insoluble in the monomer but is capable of absorbing the monomer. In a preferred aspect, a vinyl halide polyolefin graft polymer is produced by reacting a solid polyolefin particle with a vinyl halide monomer in which the polyolefin is substantially insoluble, but is capable of absorbing the monomer. The solid particles can be contacted with the monomer in one step or in stages. When the stage-wise reaction is continued until the proportion of polyolefin in the polymer product is about 2 to about 20 weight percent, the resulting product can be formed to a transparent or translucent article.Type: GrantFiled: March 10, 1987Date of Patent: February 21, 1989Assignee: Occidental Chemical CorporationInventor: Leigh E. Walker
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Patent number: 4794144Abstract: Large acrylic star polymers containing multifunctional monomers in the core are made by group transfer polymerization techniques, preferably by arm-first, core-first, or arm-core-arm approaches.Type: GrantFiled: September 30, 1986Date of Patent: December 27, 1988Assignee: E. I. Du Pont de Nemours and CompanyInventor: Harry J. Spinelli
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Patent number: 4766180Abstract: Polymeric compositions which may be readily crosslinked at temperatures above about 200.degree. C. comprise an elastomeric polymer possessing olefinic unsaturation and an effective amount of a benzocyclobutene derivative of the general formula ##STR1## where "X" is selected from the group consisting of ##STR2## where "R" is an alkylene group of 1 to 10 carbon atoms. Cured compositions are also claimed.Type: GrantFiled: December 23, 1986Date of Patent: August 23, 1988Assignee: Shell Oil CompanyInventor: Pui K. Wong
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Patent number: 4708992Abstract: A rubber composition excellent in processabilities such as rolling processability and extrusion processability before vulcanization and excellent in weather resistance and heat resistance and high in hardness after vulcanization is disclosed. This rubber composition comprises 100 parts by weight of an ethylene..alpha.-olefin copolymer rubber and/or an isobutylene-isoprene rubbers, 3 to 60 parts by weight of a polybutadiene rubber which is liquid at room temperature and/or a polyisoprene rubber which is liquid at room temperature and 3 to 35 parts by weight of sulfur.Type: GrantFiled: December 5, 1985Date of Patent: November 24, 1987Assignee: Sumitomo Chemical Company, LimitedInventors: Yoshio Tanimoto, Kohichi Iketani
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Patent number: 4699950Abstract: The present invention relates to a polymer having a thiol group at one end of the molecule, which is obtained by subjecting the monomers capable of radical polymerization to radical polymerization in the presence of a thiolcarboxylic acid and then treating the resulting polymer with an alkali or acid; to a process for producing the same; and to a block copolymer based on the polymer having a thiol group at the end.The polymer having a thiol group at one end is difficult of forming disulfide linkages by oxidation and thus difficult of becoming insoluble. It is also a highly reactive material that will find wide use in varied application areas. The block copolymer based on the polymer having a thiol group at the end is superior in compatibility and will find wide use in varied application areas.Type: GrantFiled: July 8, 1985Date of Patent: October 13, 1987Assignee: Kuraray Co., Ltd.Inventors: Toshiaki Sato, Junnosuke Yamauchi, Takuji Okaya
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Patent number: 4695607Abstract: Large acrylic star polymers, are made by group transfer polymerization techniques by arm-first, core-first, or arm-core-arm approaches.Type: GrantFiled: September 3, 1985Date of Patent: September 22, 1987Assignee: E. I. Du Pont De Nemours and CompanyInventor: Harry J. Spinelli
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Patent number: 4686263Abstract: The production of impact-resistant polystyrene with EPDM simplifies the process and produces improved products if a modified ethylene/propylene rubber consisting of styrene/butadiene- or diene polymers, ethylene, optionally propylene and an unconjugated diene are used as the elastifying component.The modified EPDM rubbers consisting of (a) from 20 to 90% by weight of ethylene units, (b) from 1 to 25% by weight of units of a butadiene/styrene copolymer containing a quantity of from 10 to 90% by weight of styrene, (c) from 0 to 10% by weight of units of an unconjugated diolefin and (d) C.sub.3 -C.sub.18 .alpha.-monolefin units to make up the difference to 100% by weight, are a further subject of this invention.Type: GrantFiled: July 22, 1985Date of Patent: August 11, 1987Assignee: Bayer AktiengesellschaftInventors: Manfred Beck, Wolfgang Nentwig
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Patent number: 4661549Abstract: Graft polymers are prepared by reacting an ethylenically unsaturated polymerizable monomer with a polymer of an olefin of 2 to about 8 carbon atoms in a process wherein the olefin polymer is substantially insoluble in the monomer but is capable of absorbing the monomer. In a preferred aspect, a vinyl halide polyolefin graft polymer is produced by reacting a solid polyolefin particle with a vinyl halide monomer in which the polyolefin is substantially insoluble, but is capable of absorbing the monomer. The solid particles can be contacted with the monomer in one step or in stages. When the stage-wise reaction is continued until the proportion of polyolefin in the polymer product is about 2 to about 20 weight percent, the resulting product can be formed to a transparent or translucent article.Type: GrantFiled: October 12, 1983Date of Patent: April 28, 1987Assignee: Occidental Chemical CorporationInventor: Leigh E. Walker
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Patent number: 4645799Abstract: A curable composition comprising an elastomeric vinylidene fluoride copolymer, an organic peroxide and a vulcanization accelerator, characterized in that said copolymer contains unsaturated bonds introduced by reacting an untreated elastomeric vinylidene fluoride copolymer dispersed in an aqueous medium, with an aqueous alkaline solution containing an onium compound.Type: GrantFiled: October 17, 1985Date of Patent: February 24, 1987Assignee: Asahi Glass Company, Ltd.Inventors: Hiroshi Wachi, Seitoku Kaya, Gen Kojima
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Patent number: 4614768Abstract: Blends of polymers of diene and styrene-.alpha.-methylstyrene type monomers are prepared by solution polymerization employing intermittent addition of monomers and initiators to provide a desired composition.Type: GrantFiled: May 17, 1985Date of Patent: September 30, 1986Assignee: The Dow Chemical CompanyInventor: Grace Y. Lo
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Patent number: 4560729Abstract: A rubber composition having improved steam resistance comprising a nitrile group-containing hydrocarbon rubber having an iodine number of not more than 120, an organic peroxide vulcanizer and a crosslinking coagent, the amount of said crosslinking coagent being 8 to 30 parts by weight per 100 parts by weight of said rubber.Type: GrantFiled: October 19, 1984Date of Patent: December 24, 1985Assignee: Nippon Zeon Co. Ltd.Inventors: Noboru Watanabe, Yoichiro Kubo
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Patent number: 4548993Abstract: Process for cross-linking polypropylene, propylene copolymers, polyethylene, ethylene/propylene and ethylene/propylene/diene elastomeric copolymers and mixtures of said elastomers with above said thermoplastic polyolefins, which consists in modifying the polymer in the molten state, by the addition of 0.01%-10% by weight of carboxylic acid, possibly in the presence of a generator of radicals and by the subsequent salification with metal ions of the thus grafted carboxylic groups. The polymer products thus obtained display considerably improved characteristics under heating. In particular, there are obtained improved processability and elastic recovery characteristics for thermoplastic rubbers.Type: GrantFiled: February 9, 1983Date of Patent: October 22, 1985Assignee: Montedison S.p.A.Inventors: Enea Garagnani, Alessandro Moro, Roberto Marzola
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Patent number: 4539375Abstract: Improved impact modifier composition comprising elastomeric impact modifier polymer and dunkelsperser in a weight ratio of about 99.5/0.5 to 96/4 which is subject to substantially reduced gel formation in rigid thermoplastic matrix polymer formulations. Also disclosed are such formulations, as well as processes for preparing the improved impact modifier compositions.Type: GrantFiled: October 12, 1983Date of Patent: September 3, 1985Assignee: Rohm and Haas CompanyInventor: David L. Dunkelberger
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Patent number: 4530944Abstract: Elastomers are plasticized with a polymerizable monomer, in homogeneous admixture therewith, by adding the monomer to a latex of the elastomer, free of polymerization initiator, followed by coagulation of the monomer and polymer solids. The coagulated solids recovered from the latex may be compounded with a polymerization initiator for the monomer and a vulcanizing agent for the polymer and, optionally, an inorganic filler, and shaped into the desired product form. Polymerization of the polymer and vulcanization of the elastomeric polymer are initiated after shaping.Type: GrantFiled: July 2, 1984Date of Patent: July 23, 1985Assignee: SW Industries, Inc.Inventor: Parviz Hamed
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Patent number: 4528331Abstract: A conventional sealant composition having as its essential rubber components (1) at least one high molecular weight, hydrogenated polybutadiene polymer, and (2) at least one low molecular weight liquid elastomer, i.e., polybutene, as tackifying polymer, compatible to a high degree with said hydrogenated polymer; the resultant sealant composition reflecting a co-continuous phase morphology wherein said hydrogenated polymer provides a crosslinked network in said compatible low molecular weight liquid elastomer.Type: GrantFiled: April 26, 1984Date of Patent: July 9, 1985Assignee: The Firestone Tire & Rubber CompanyInventors: Georg G. A. Bohm, Mario DeTrano, James E. Hall
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Patent number: 4526916Abstract: A composition particularly adapted for use in a rotational moulding process is disclosed. The composition comprises polyethylene having a density of 0.920-0.970 g/cm.sup.3 and a melt index of 10-35 dg/min., 0.3-1.3% by weight of a bis(tert. alkyl peroxyalkyl) benzene, 0.2-1.5% by weight of a co-curing agent selected from triallyl cyanurate, triallyl isocyanurate and 1,2-polybutadiene, 0.01-0.05% by weight of a hindered phenolic antioxidant and 0.01-0.2% by weight of a secondary antioxidant. The preferred secondary antioxidant is tris di(tert.-butyl phenyl) phosphite. The composition may be used in for example, the moulding of tanks, barrels, containers and the like.Type: GrantFiled: January 31, 1983Date of Patent: July 2, 1985Assignee: Du Pont Canada Inc.Inventor: George White
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Patent number: 4501867Abstract: A 1,2-polymerization of 1,3-butadiene is carried out in a polymerization solvent in the presence of a 1,2-polymerization catalyst consisting essentially of a cobalt compound soluble in the polymerization solvent, an organic aluminum halide, an organic magnesium compound, and carbon disulfide and/or phenyl isothiocyanate and in the presence or absence of a cis-1,4-polymerization product of 1,3-butadiene.Type: GrantFiled: October 7, 1983Date of Patent: February 26, 1985Assignee: Ube Industries, Ltd.Inventors: Haruo Ueno, Hidetomo Ashitaka, Koichi Nakajima
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Patent number: 4493922Abstract: An impact-resistant thermoplastic molding material, containing polystyrene as the matrix, and, dispersed therein, two elastomeric polymers or copolymers I and II composed entirely or predominantly of 1,3-dienes and containing particles of different mean size, namely, in I, particles from 0.2 to 0.6 .mu.m in size and having capsule particle morphology, and, in II, particles from 2 to 8 .mu.m in size, having cell particle or coil particle morphology.Type: GrantFiled: January 25, 1984Date of Patent: January 15, 1985Assignee: BASF AktiengesellschaftInventors: Adolf Echte, Hermann Gausepohl
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Patent number: 4491621Abstract: An oil resistant diaphragm having a liquid contacting surface made of a vulcanized rubber composition of, or composed mainly of, partially hydrogenated unsaturated nitrile-conjugated diene copolymer rubber in which at least 50% of the conjugated diene units is hydrogenated. This diaphragm is superior in resistance to deteriorated gasoline and low temperature, and is suitable for the automobile fuel pump.Type: GrantFiled: November 19, 1982Date of Patent: January 1, 1985Assignees: Toyoda Gosei Co., Ltd., Toyota Jidosha Kabushiki KaishaInventors: Tadaoki Okumoto, Masatoshi Sugimoto, Noriyuki Horiuchi, Seiichi Sahara, Tetsuo Yamada, Kinrou Hashimoto, Masayoshi Ichikawa, Fujio Ninomiya
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Patent number: 4485198Abstract: Elastomers are plasticized with a polymerizable monomer, in homogeneous admixture therewith, by adding the monomer to a latex of the elastomer, free of polymerization initiator, followed by coagulation of the monomer and polymer solids. The coagulated solids recovered from the latex may be compounded with a polymerization initiator for the monomer and a vulcanizing agent for the polymer and, optionally, an inorganic filler, and shaped into the desired product form. Polymerization of the polymer and vulcanization of the elastomeric polymer are initiated after shaping.Type: GrantFiled: September 23, 1982Date of Patent: November 27, 1984Assignee: SW Industries, Inc.Inventor: Parviz Hamed