Organic Sulfur Compound Contains -s-s- Or -o-o-group Patents (Class 526/223)
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Patent number: 5767212Abstract: The present invention relates to a method of producing a sulfur-containing transparent polymer by polymerizing a composition containing a (metha)acrylate monomer having sulfur in its molecule, characterized by radical polymerization of a composition containing at least one compound selected from radical chain transfer compounds and radical trapping compounds in an amount of 0.1 to 7.0% by weight of the total amount of the composition. The polymer obtained by polymerization is less colored. The method can provide a polymer having a high total light transmittance, a high refractive index and a light weight and is hardly yellowed during use.Type: GrantFiled: December 31, 1996Date of Patent: June 16, 1998Assignee: Toray Industries, Inc.Inventors: Yuichiro Iguchi, Setsuo Baba, Koichiro Oka
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Patent number: 5703184Abstract: A process for producing a styrenic polymer having a wide-spread molecular weight distribution, which comprises polymerizing a styrenic monomer or a styrenic monomer and a monomer copolymerizable with the styrenic monomer in the presence of 50 to 5000 ppm by weight of at least one compound selected from compounds having a dithiocarbamate group and sulfide compounds having at least one of an aryl group, an arylalkyl group and a thiazole group based on the total monomer to a final conversion of 40% by weight or more in the absence or presence of a radical initiator subjecting to a suspension polymerization, a batchwise bulk polymerization or a continuous bulk polymerization using a plug flow type polymerization reactor. According to the present invention, there can be provided a simplified process for preparing a styrenic polymer having a wide-spread molecular weight distribution.Type: GrantFiled: March 29, 1996Date of Patent: December 30, 1997Assignee: Sumitomo Chemical Company, LimitedInventors: Masayuki Fujita, Takahiro Ishii
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Patent number: 5693731Abstract: The specification discloses a method for making DCPD based resins that have essentially unimodal molecular weight distributions. The method comprises polymerizing dicyclopentadiene monomer in the presence of an organic sulfur compound which is effective to control the molecular weight distribution of the polymerized product. For end-use performance in inks, adhesives, coatings and other related areas, the invention provides dicyclopentadiene based resins having molecular weight distributions which effectively enhance the resin solubility and compatability in various formulations.Type: GrantFiled: March 13, 1996Date of Patent: December 2, 1997Assignee: Arizona Chemical CompanyInventors: Theodore J. Williams, John J. Schmid
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Patent number: 5523365Abstract: The invention relates to crosslinked organopolysiloxanes which contain groups which form free radicals and are built up from units of the formula[R.sub.a Si(O.sub.(3-a)/2)-R.sup.1 -X-(R.sup.1 -Si(O.sub.(3-a)/2)).sub.b R.sub.a ] (1),in whichX is a radical from the group consisting of --N.dbd.N--, --O--O--, --S--S-- and --C(C.sub.6 H.sub.5).sub.2 --C(C.sub.6 H.sub.5).sub.2 --, andR is monovalent SiC-bonded, optionally substituted C.sub.1 - to C.sub.18 -hydrocarbon radicals,R.sup.1 is divalent SiC-bonded, optionally substituted C.sub.1 - to C.sub.18 -hydrocarbon radicals which can be interrupted by divalent radicals, bonded to carbon atoms on both sides, from the group consisting of --O--, --COO--, --OOC--, --CONR.sup.2 --, --NR.sup.2 CO-- and --CO--,R.sup.2 is a hydrogen atom or a radical R,a has the values 0, 1 or 2 andb has the values 0 or 1,and further organosiloxane units. The organopolysiloxanes are used as free radical macroinitiators for grafting polymerization of ethylenically unsaturated monomers.Type: GrantFiled: October 11, 1994Date of Patent: June 4, 1996Assignee: Wacker-Chemie GmbHInventors: Michael Geck, Jochen Dauth, Bernward Deubzer, Helmut Oswaldbauer, Manfred Schmidt, Frank Baumann
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Patent number: 5410004Abstract: The specification discloses a method for making DCPD based resins that have relatively narrow molecular weight distributions. The method comprises thermally polymerizing dicyclopentadiene monomer in the presence of one or more strong acids, preferably with an olefinic modifier, to provide a dicyclopentadiene oligomer. Optionally, an organic sulfur species can also be used to further effect molecular weight control. For end-use performance in inks, adhesives, coatings and other related areas, the invention provides dicyclopentadiene oligomer resins having weight average molecular weights less than 1000 and relatively narrow molecular weight distributions, as measured by a polydispersity index, of less than about 2.3. Among the strong acids that are effective for controlling molecular weight, hypophosphorous acid is preferred because it gives light colored resins.Type: GrantFiled: January 24, 1994Date of Patent: April 25, 1995Assignee: Arizona Chemical CompanyInventor: Theodore J. Williams
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Patent number: 5391665Abstract: There are provided a process for obtaining a polymer having hydroxyl groups at both terminals easily and with cheap cost and excellent efficiency from a wide variety of vinyl-based compounds, a composition containing said polymer and its use, and a polymer derived from said composition and its use.The polymerization reaction of a vinyl-based monomer (b) is carried out by using a radical polymerization initiator (c) in the presence of a compound (a) represented by the general formula:HO--A--(S).sub.x --B--OH (I)and, a polymer having hydroxyl groups at both terminals is obtained under conditions that, in the above reaction, any compound other than (a), (b) and (c) is not practically used and the compound (a) always exists in 50 mole times or more of the initiator (c) in the course of reaction in a reactor; and either a composition containing this polymer or a polymer derived from this composition is used.Type: GrantFiled: April 2, 1993Date of Patent: February 21, 1995Assignee: Nippon Shokubai Co., Ltd.Inventors: Toshiaki Matsunaga, Kazuo Takei, Taketo Toba, Hiroyuki Ikeuchi, Fumihide Tamura
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Patent number: 5376725Abstract: Polymer alloys which comprise (A) at least one cycloolefin polymer and (B) at least one polyaryl ether ketone, the amounts of (A) being 1 to 99% by weight and those of (B) being 99 to 1% by weight and relatively making up 100% by weight, with respect to the total alloy, are described. Such polymer alloys can be used as a matrix material for composite materials or for the production of shaped articles.Type: GrantFiled: September 8, 1993Date of Patent: December 27, 1994Assignee: Hoechst AktiengesellschaftInventors: Ulrich Epple, Arnold Schneller, Harald Cherdron
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Patent number: 5357010Abstract: Polychloroprene polymers having stable viscosities and good scorch resistance, as well as excellent mechanical and dynamic properties in vulcanized state, are prepared by polymerizing chloroprene in alkaline aqueous emulsion, in the presence of a free-radical initiator and a combination chain-transfer agent including (1) at least one xanthogen disulfide and (2) at least one bis(acylaminophenyl)polysulfide.Type: GrantFiled: February 25, 1993Date of Patent: October 18, 1994Assignee: Enichem Elastomeres France SAInventors: Francois Sauterey, Paul Branlard, Paul Poullet
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Patent number: 5354800Abstract: There is disclosed a method of producing copolymer latices which are useful as binders in paper coating compositions capable of providing coated papers with good and balanced physical characteristics, including adhesive strength, water resistance, ink acceptability and sheet gloss and which can further be used as carpet backing agents and as adhesives.Type: GrantFiled: October 28, 1992Date of Patent: October 11, 1994Assignee: Takeda Chemical Industries, Ltd.Inventors: Shigeo Suzuki, Susumu Abe, Fuyuo Maeda, Tomotaka Seo
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Patent number: 5349008Abstract: Disclosed herein is a process for suspension polymerization of a vinyl polymer which comprises using as the suspending agent a polyvinyl ester polymer having an ionic group at an end thereof or a polyvinyl alcohol polymer having a degree of hydrolysis of 90 mol % or less which is obtained by hydrolysis of the above polyvinyl ester polymer.According to the above-mentioned process, vinyl polymer granules having a sharp granulometric dispersion, high bulk density, high plasticizer absorption and low vinyl monomer residue are obtained.Type: GrantFiled: December 4, 1991Date of Patent: September 20, 1994Assignee: Kuraray Co., Ltd.Inventors: Shigeki Takada, Ken Yuki, Hitoshi Maruyama, Taku Tanaka, Kazunari Igarashi
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Patent number: 5314964Abstract: A process for the preparation of novel grafted latexes having backbones formed from unsaturated monomers and having pendent isocyanate containing sidechains derived from isopropenyl-alpha, alpha- dimethylbenzyl isocyanate or copolymers thereof is described.Grafting latexes is carried out using a free radical redox initiator system in an aqueous medium. Latexes such as polybutadiene, polyvinyl chloride, and polyvinyl chloride-acrylic copolymers are converted to the corresponding isocyanate-functional latexes by the process of the invention. The isocyanate-functional grafted and cografted latexes described are useful in curable compositions.Type: GrantFiled: November 2, 1990Date of Patent: May 24, 1994Assignee: Cytec Technology Corp.Inventor: Howard R. Lucas
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Patent number: 5298580Abstract: Vulcanizable, mercaptan- and/or xanthogen-disulfide-regulated polychloroprene rubber are produced by emulsion polymerization of chloroprene and, based on polymerizable monomer used, 0 to 30 parts by weight ethylenically unsaturated, other monomers copolymerizable with chloroprene in an alkaline medium by a process in which(1) 0.1 to 10 parts by weight of a tricyclic diterpene carboxylic acid containing at least two conjugated C.dbd.C double bonds per molecule, based on the polymerizable monomer used, and optionally(2) 0.1 to 5 parts by weight, based on polymerizable monomer used, fatty acid estersare used for their production.The polychloroprene produced in accordance with the invention may be used for the production of vulcanized rubber articles. The polychloroprene rubbers produced by the process according to the invention have a minimal tendency to foul metal molds. The pollution of wastewaters by the process according to the invention is minimal.Type: GrantFiled: September 18, 1992Date of Patent: March 29, 1994Assignee: Bayer AGInventors: Peter Wendling, Werner Obrecht, Michael Happ, Rudiger Musch, Eberhard Muller
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Patent number: 5252678Abstract: An acrylic elastomer capable of giving a vulcanization product having a distinguished tensile strength and a good stretching even by cross-linking with an organic peroxide can be obtained by using an organic peroxide having a non-conjugated double bond as a polymerization initiator in polymerization of at least one of (a) alkyl acrylates having an alkyl group of 1 to 8 carbon atoms and (b) alkoxyalkyl acrylates having an alkoxylalkyl group of 2 to 8 carbon atoms.Type: GrantFiled: October 27, 1992Date of Patent: October 12, 1993Assignee: Nippon Mektron LimitedInventors: Yuichi Yamamoto, Kazuma Yokoi, Haruyoshi Tatsu
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Patent number: 5247033Abstract: A polymerization method carried out in the presence of unsaturated hydroperoxides useful as molecular weight regulators, is disclosed. Also disclosed are polymers and oligomers made by this process and articles of manufacture comprising one or more polymers or oligomers made by this process. These molecular weight regulating hydroperoxides provide the ability to introduce an epoxy functionality to the oligomer or polymer as well as an additional functionality and a primary hydroxy group. Further, omega substituted or alpha, omega disubstituted polymers may be synthesized using the unsaturated hydroperoxides of the present invention.Type: GrantFiled: April 28, 1992Date of Patent: September 21, 1993Assignee: Akzo N.V.Inventors: Luc L. T. Vertommen, John Meijer
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Patent number: 5194540Abstract: An acrylic elastomer capable of giving a vulcanization product having a distinguished tensile strength and a good stretching even by cross-linking with an organic peroxide can be obtained by using an organic peroxide having a non-conjugated double bond as a polymerization initiator in polymerization of at least one of (a) alkyl acrylates having an alkyl group of 1 to 8 carbon atoms and (b) alkoxyalkyl acrylates having an alkoxyalkyl grouop of 2 to 8 carbon atoms.Type: GrantFiled: July 11, 1992Date of Patent: March 16, 1993Assignee: Nippon Mektron LimitedInventors: Yuichi Yamamoto, Kazuma Yokoi, Haruyoshi Tatsu
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Patent number: 5194539Abstract: Odorless, aqueous copolymer dispersions are produced by emulsion copolymerizing a comonomer recipe which comprises at least 60% by weight of styrene and/or butadiene and/or an acrylic ester and/or a vinyl nitrile, and, optionally, up to 40% by weight of at least one other copolymerizable comonomer, in an aqueous medium of copolymerization, in the presence of an alkoxy, aryloxy, acyloxy or acylamino substituted diphenyl disulfide chain transfer agent.Type: GrantFiled: August 1, 1991Date of Patent: March 16, 1993Assignee: Rhone-Poulenc ChimieInventors: Dominique Charmot, Nicole Oger
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Patent number: 5147455Abstract: A method of preventing polymer scale deposition during polymerization of a monomer having an ethylenically double bond in a polymerization vessel, comprising the step of carrying out said polymerization in a polymerization vessel of which the inner wall surface has a coating comprising a water-soluble polysaccharide; and a polymer scale preventive agent comprising polysaccharide. By use of the method or agent, deposition of polymer scale can be effectively prevented; in addition, polymers with a high whiteness can be prepared. Moreover, the scale preventive agent used has no poisonousness or the like and is highly safe.Type: GrantFiled: May 24, 1991Date of Patent: September 15, 1992Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Mikio Watanabe, Masahiro Usuki, Susumu Ueno
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Patent number: 4988760Abstract: The invention relates to a soluble, cross-linkable acrylate copolymer which is obtainable by copolymerization of more than 3 to 30% by weight of monomers having at least two polymerizable, olefinically unsaturated double bonds, from 5 to 50% by weight of monomers having a cross-linkable group, with the exception of hydroxyl groups and carboxyl groups, and from 20 to 92% by weight of further monomers having a polymerizable, olefinically unsaturated double bond, the sum of the monomers being 100% by weight. The invention furthermore relates to processes for the preparation of acrylate copolymers and coating agents based on the acrylate copolymers according to the invention.Type: GrantFiled: December 5, 1989Date of Patent: January 29, 1991Assignee: BASF Lacke & Farben AktiengesellschaftInventors: Werner Jung, Axel Sievers
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Patent number: 4910274Abstract: A method for preparing hydroxyl-containing polymers comprising polymerizing at least one free radical-polymerizable monomer in the presence of at least one monohydroxy-containing chain transfer agent and at least one hydroxy-containing free radical initiator. The method results in monohydroxy-functional polymers in yields in excess of 90%.Type: GrantFiled: February 7, 1989Date of Patent: March 20, 1990Assignee: The Dow Chemical CompanyInventor: Duane B. Priddy
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Patent number: 4857616Abstract: Storage-stable polychloroprene is obtained, by aqueous emulsion polymerization, using xanthogen disulphides as molecular weight regulators, when a peptizing agent is added after the end of the polymerization.Type: GrantFiled: February 11, 1988Date of Patent: August 15, 1989Assignee: Bayer AktiengesellschaftInventors: Rudiger Musch, Eberhard Muller, Gerhard Hohmann, Karl-Heinz Schabel
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Patent number: 4694057Abstract: It has unexpectedly been discovered that 1-(1-isocyanato-1-methylethyl)-3-(1-methylethenyl) benzene(m-TMI) can be emulsion copolymerized with other monomers into useful polymers. For example, it has been found that m-TMI can be emulsion copolymerized with diene monomers to produce polymers which contain pendant isocyanate groups. Such pendant isocyanate groups are useful in a variety of applications. For instance, such pendant isocyanate groups can be utilized as sites to which chemical agents, such as antidegradants, can be bound to the polymer. Elastomers which contain such pendant isocyanate groups are of value since they can be crosslinked without employing sulfur. Elastomers of this type which contain pendant isocyanate groups can also potentially be thermo-reversibly crosslinked.Type: GrantFiled: March 6, 1985Date of Patent: September 15, 1987Assignee: The Goodyear Tire & Rubber CompanyInventors: Robert A. Smith, Dane K. Parker, Howard A. Colvin, Arthur H. Weinstein, Dennis B. Patterson
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Patent number: 4658001Abstract: A random copolymer comprising specific groups represented by the general formula: ##STR1## and specific peroxycarbonate structural units represented by the general formula: ##STR2## is produced by a method which comprises causing a compound of the formula: ##STR3## to react with a compound of the formula: ##STR4##Type: GrantFiled: October 4, 1985Date of Patent: April 14, 1987Assignee: Nippon Oils & Fats Co., Ltd.Inventors: Kenji Kato, Yuji Okada, Kazuyoshi Aoshima
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Patent number: 4348515Abstract: This invention relates to a heat curing process and to heat activated compositions comprising(1) an ethylenically unsaturated compound containing at least two carbon-to-carbon double bonds and(2) a thiuram.Type: GrantFiled: September 17, 1980Date of Patent: September 7, 1982Assignee: W. R. Grace & Co.Inventor: Charles R. Morgan
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Patent number: 4255539Abstract: Sulfur-modified polychloroprene in alkaline aqueous emulsion is prepared by incorporating one or more organic polysulfides which act as peptizing agents during the polymerization of the chloroprene. The sulfur-modified polychloroprenes obtained have stable viscosities.Type: GrantFiled: October 31, 1979Date of Patent: March 10, 1981Assignee: DistugilInventors: Paul Branlard, Jean-Pierre Merle
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Patent number: 4245072Abstract: A highly dispersed emulsion of an organosulfur compound is obtained by use of a coemulsification system of a surfactant, and an electrolyte, and a cosurfactant and optionally a hydrocarbon; such as a petroleum sulfonate with potassium chloride and hexyl alcohol. Conversion of organosulfur compounds into highly dispersed emulsions increases the reactivity of the organosulfur compound as a molecular weight modifier in an aqueous emulsion polymerization system and permits the efficient use of high molecular weight organosulfur compounds.Type: GrantFiled: March 6, 1979Date of Patent: January 13, 1981Assignee: Phillips Petroleum CompanyInventors: Carl A. Uraneck, Earl Clark
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Patent number: 4224425Abstract: What is disclosed is a method for the partial polymerization of at least one vinyl monomer to form a mixture of said monomer with a polymer thereof, which comprises initiating polymerization of said monomer with a percarbonic acid ester and inhibiting further polymerization when the desired mixture is formed by addition thereto of a thioether, an organic disulfide, or a mercaptan, as are the partially-polymerized mixtures so produced, and their use for forming an organic glass by further polymerization thereof.Type: GrantFiled: April 9, 1979Date of Patent: September 23, 1980Assignee: Rohm GmbHInventors: Peter Buergle, Karl Maurer, Manfred Munzer, Wilhelm Rosskopp, Franz Wenzel
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Patent number: 4180638Abstract: Storable polychloroprene adhesives can be produced by polymerizing chloroprene in a manner known per se in the presence of a dialkylxanthogen disulphide reacting 50 to 90% of the monomer and dissolving the polymer thus obtained in an organic solvent to obtain viscosities in the range of 10 to 100 poises.Type: GrantFiled: October 28, 1976Date of Patent: December 25, 1979Assignee: Bayer AktiengesellschaftInventors: Manfred Dollhausen, Gerhard Hohmann, Winfried Behr
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Patent number: 4160079Abstract: Chloroprene is polymerized in the presence of compounds of the formula ##STR1## where X, Y and Z are selected from the group consisting of oxygen and sulfur, R.sub.1 is a hydrocarbon radical having from 1 to 8 carbon atoms, R.sub.2 is a hydrocarbon radical having from 1 to 8 carbon atoms or is a radical the same as ##STR2## R.sub.3 and R.sub.4 are selected from the group consisting of hydrocarbon radicals having from 1 to 8 carbon atoms or hydrogen with at least one of R.sub.3 and R.sub.4 not being hydrogen and n is 1 to 4.Type: GrantFiled: September 9, 1977Date of Patent: July 3, 1979Assignee: Denka Chemical CorporationInventor: Morris S. Edmondson
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Patent number: 4151339Abstract: A process for polymerizing vinyl chloride and for copolymerizing vinyl chloride and up to 30 percent by weight of comonomers in aqueous suspension under heat and pressure in the presence of a mixture of an acyl sulfonyl peroxide and a perester of the formula ##STR1## wherein R.sub.3, R.sub.4, and R.sub.5 are the same or different alkyl groups of from 1 to about 10 carbon atoms provided not more than one of R.sub.3, R.sub.4, and R.sub.5 is methyl, and R is selected from 2,2-dimethyl propyl and straight chain alkyl of 1-5 carbon atoms.Type: GrantFiled: November 1, 1974Date of Patent: April 24, 1979Assignee: Argus Chemical CorporationInventors: Ronald L. Friedman, Roger N. Lewis
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Patent number: 4121033Abstract: Chloroprene-sulfur copolymers having improved storage stability are produced by carrying out the emulsion polymerization in the presence of organic polysulfide compounds of the formula. ##STR1## where X, Y and Z are selected from the group consisting of oxygen and sulfur, R.sub.1 is a hydrocarbon radical having from 1 to 8 carbon atoms, R.sub.2 is a hydrocarbon radical having from 1 to 8 carbon atoms or is a radical the same as ##STR2## R.sub.3 and R.sub.4 are selected from the group consisting of hydrocarbon radicals having from 1 to 8 carbon atoms or hydrogen with at least one R.sub.3 and R.sub.4 not being hydrogen and n is 1 to 4.Type: GrantFiled: November 8, 1976Date of Patent: October 17, 1978Assignee: Denka Chemical CorporationInventor: Morris S. Edmondson
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Patent number: 4107419Abstract: Organic peroxide polymerization co-initiator compositions and their use in the initiation of the polymerization of certain monomers and comonomers such as vinyl chloride, ethylene and methyl methacrylate. The co-initiator composition contains an alpha halo substituted diacyl peroxide and a coperoxide selected from t-alkyl peresters of t-hydroperoxides, peroxydicarbonates, acyl peroxycarbonic esters, and aliphatic diacyl peroxides. Typical is acetyl 2-chlorooctanoyl peroxide with t-butyl peroxy neodecanoate.Type: GrantFiled: March 4, 1977Date of Patent: August 15, 1978Assignee: Argus Chemical CorporationInventors: Ronald L. Friedman, deceased, Roger N. Lewis
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Patent number: 4098981Abstract: Storage stable liquid compositions are prepared from solid acyl alkylsulfonyl peroxides and polar or polarizable solvents or solvent mixtures. The compositions are liquid at 0.degree. C to -40.degree. C and are useful as free-radical initiators for polymerization of vinyl monomers.Type: GrantFiled: May 4, 1977Date of Patent: July 4, 1978Assignee: Pennwalt CorporationInventor: Jose Sanchez
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Patent number: 4092469Abstract: Bis(1,3-dienyl)dialkyltin, lead, and germanium compounds employed in the aqueous emulsion polymerization of conjugated dienes, optionally with vinyl comonomers, provide polymers with sufficiently high Mooney viscosity values as to be readily handled in plant operations, yet which exhibit controlled breakdown under milling to lower Mooney values suitable, for a variety of uses.Type: GrantFiled: January 12, 1977Date of Patent: May 30, 1978Assignee: Phillips Petroleum CompanyInventors: Carl A. Uraneck, Paul W. Solomon
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Patent number: 4072810Abstract: A new class of compounds: R-W-R' where R and R' are identical oxy radicals containing peroxide functions such as dialkyl or diaralkyl peroxide, peroxyketal, peroxyester, or monoperoxycarbonate, and W is a carbonyl group, or carbonyl containing group, or an alkylidene or aralkylidene group, or a phosphorus containing group.Examples:Di[1,3-dimethyl-3-(t-butylperoxy)butyl] carbonate;Di[1,3-dimethyl-3-(n-butoxycarbonylperoxy)butyl] carbonate;2,2-Bis[3,3-di(t-butylperoxy)butoxy] propane;Di[1,3-dimethyl-3-(t-butylperoxy)butyl] ethyl phosphate.They are free radical affording compounds useful in crosslinking of polyolefins and unsaturated polymers, and for the polymerization of vinyl monomers and diolefinic monomers.Type: GrantFiled: March 16, 1973Date of Patent: February 7, 1978Assignee: Pennwalt CorporationInventors: Antonio J. D'Angelo, Orville L. Mageli, Chester S. Sheppard
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Mixing of organosulfur molecular weight modifier with emulsifier for emulsion polymerization systems
Patent number: 4064337Abstract: Organosulfur molecular weight regulators for emulsion polymerization systems, such as mercaptan compounds, are mixed and agitated with the aqueous emulsifier prior to use in emulsion polymerization systems. The modifying efficiency of the organosulfur molecular weight modifiers can be controlled by the degree of agitation. In many cases, adding the agitated mixture incrementally to the emulsion polymerization system further improves effectiveness of the modifier.Type: GrantFiled: December 11, 1972Date of Patent: December 20, 1977Assignee: Phillips Petroleum CompanyInventors: Carl A. Uraneck, John E. Burleigh -
Patent number: 4061850Abstract: Chloroprene is polymerized in the presence of compounds of the formula ##STR1## where X, Y and Z are selected from the group consisting of oxygen and sulfur, R.sub.1 is a hydrocarbon radical having from 1 to 8 carbon atoms, R.sub.2 is a hydrocarbon radical having from 1 to 8 carbon atoms or is a radical the same as ##STR2## R.sub.3 and R.sub.4 are selected from the group consisting of hydrocarbon radicals having from 1 to 8 carbon atoms or hydrogen with at least one of R.sub.3 and R.sub.4 not being hydrogen and n is 1 to 4.Type: GrantFiled: August 18, 1975Date of Patent: December 6, 1977Assignee: Petro-Tex Chemical CorporationInventor: Morris S. Edmondson
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Patent number: 4054731Abstract: A process for preparing a chloroprene-based liquid polymer having active terminal groups substantially at the terminals thereof comprising polymerizing chloroprene alone or in combination with one or more monomers copolymerizable with chloroprene in (1) an organic solvent having a boiling point of about 160.degree. C or less at atmospheric pressure and selected from the group consisting of aromatic hydrocarbons, aliphatic halogenated hydrocarbons and cyclic ethers, or (2) in carbon disulfide, which is present in an amount of about 20 to 200 parts by weight per 100 parts by weight of the total monomer, in the presence of a xanthogen disulfide compound represented by the formula: ##STR1## wherein R can contain from 1 to 12 carbon atoms and is an alkyl group, an aryl group, an aralkyl group or a cycloaliphatic group, which is present in an amount substantially equal to a ratio of about 2.5 to 20 parts by weight of diethyl xanthogen disulfide per 100 parts by weight of the total monomer.Type: GrantFiled: July 17, 1975Date of Patent: October 18, 1977Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Kiyonobu Marubashi, Hideji Oshima, Yasuaki Sakano
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Patent number: 4043940Abstract: Storage stable liquid compositions are prepared from solid acyl alkylsulfonyl peroxides and polar or polarizable solvents or solvent mixtures. The compositions are liquid at 0.degree. to -40.degree. C and are useful as free-radical initiators for polymerizaton of vinyl monomers.Type: GrantFiled: July 15, 1975Date of Patent: August 23, 1977Assignee: Pennwalt CorporationInventor: Jose Sanchez
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Patent number: 4041227Abstract: Bis(1,3-dienyl)dialkyltin, lead, and germanium compounds employed in the aqueous emulsion polymerization of conjugated dienes, optionally with vinyl comonomers, provide polymers with sufficiently high Mooney viscosity values as to be readily handled in plant operations, yet which exhibit controlled breakdown under milling to lower Mooney values suitable, for a variety of uses.Type: GrantFiled: November 25, 1975Date of Patent: August 9, 1977Assignee: Phillips Petroleum CompanyInventors: Carl A. Uraneck, Paul W. Solomon
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Patent number: 4027090Abstract: Acrylonitrile copolymers having controlled molecular weight are prepared using a synergistic mixture of mercaptan and certain hydrocarbons as chain transfer agent.Type: GrantFiled: February 5, 1976Date of Patent: May 31, 1977Assignee: Standard Oil CompanyInventors: Brandford E. Giddings, Janet M. Eggett
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Patent number: 4013824Abstract: Initial depletion of organosulfur molecular weight regulator during initial polymerization conversion in emulsion polymerization systems employing coagitated mixtures of emulsifiers and organosulfur molecular weight regulators is reduced by coagitating in the presence of an additive which is monomer-soluble diluent a portion of polymerizable monomer prior to use of the coagitated admixture in the emulsion polymerization systems.Type: GrantFiled: November 18, 1974Date of Patent: March 22, 1977Assignee: Phillips Petroleum CompanyInventors: Carl A. Uraneck, John E. Burleigh
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Patent number: 4007145Abstract: Long-chain fatty acids having conjugated unsaturation, such as tung acid, when used as emulsifiers in the polymerization of chloroprene, produce polymers having higher tensile strength than produced by similar unconjugated fatty acid emulsifiers.Type: GrantFiled: January 10, 1975Date of Patent: February 8, 1977Assignee: Petro-Tex Chemical CorporationInventor: Morris S. Edmondson
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Patent number: 4000222Abstract: Dialkoxyxanthogendisulphides, their production by reacting an alcohol and carbondisulphide in the presence of alkali and subsequent oxidation, use of these dialkoxyxanthogendisulphides as molecular weight regulators in polymerization processes and a mixture of chloroprene-copolymers made in the presence of dialkoxyxanthogendisulphides.Type: GrantFiled: August 7, 1974Date of Patent: December 28, 1976Assignee: Bayer AktiengesellschaftInventors: Rudolf Mayer-Mader, Jurgen Boldt
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Patent number: 3984384Abstract: Dialkoxyxanthogendisulphides, their production by reacting an alcohol and carbondisulphide in the presence of alkali and subsequent oxydation, use of these dialkoxyxanthogendisulphides as molecular weight regulators in polymerization processes and a mixture of chloroprene-copolymers made in the presence of dialkoxyxanthogendisulphides.Type: GrantFiled: August 7, 1974Date of Patent: October 5, 1976Assignee: Bayer AktiengesellschaftInventors: Rudolf Mayer-Mader, Jurgen Boldt
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Patent number: 3975461Abstract: A graft copolymer is provided which is characterized by excellent gas impermeability, transparency and impact strength, as well as good flowability, and hence good molding workability, by copolymerizing an olefinically unsaturated nitrile with an alkyl vinyl ether in the presence of a rubbery polymer, which contains at least 50% by weight of a conjugated diene; said olefinically unsaturated nitrile being present in an amount of from 60 to 95% by weight, based on the total weight of said olefinically unsaturated nitrile and said alkyl vinyl ether; and wherein said olefinically unsaturated nitrile and said alkyl ether are present in an amount of from 3 to 50 times by weight the quantity of said rubbery polymer.Type: GrantFiled: January 11, 1974Date of Patent: August 17, 1976Assignee: Mitsubishi Chemical Industries Ltd.Inventors: Takeshi Yamawaki, Masahiro Hayashi, Kazuo Endo
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Patent number: 3969297Abstract: Emulsions of ethylene homopolymer and/or copolymers are provided which are remarkably clear and have a light transmission of at least about 95%, and contain particles which have an average size no greater than about 100 angstrom units. These emulsions are produced by polymerizing ethylene, or ethylene with at least one other alpha unsaturated monomer in aqueous medium in the presence of an effective amount of a water soluble persulfate initiator, from about 2 to about 5 percent by weight based on the aqueous medium of an alkyl aryl sulfonate surfactant, and from about 0.3 to about 0.7 percent by weight based on the aqueous medium of an alkyl mercaptan. The resulting clear emulsions are combined with clear polish latexes such as acrylic latexes to form clear polish compositions.Type: GrantFiled: January 14, 1975Date of Patent: July 13, 1976Assignee: Cosden Technology, Inc.Inventors: Glenn E. Teer, Jerry G. Higgins, George D. Warren
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Process employing xanthogen disulphides with functional groups to produce chloroprene polymer blends
Patent number: 3954916Abstract: This invention relates to xanthogen disulphides of the formula ##EQU1## in which R is the same or different and denotes the following groups: ##EQU2## wherein X = H, alkyl, aryl, aralkyl or halogenn = 1 to 20,A process for preparing them, a process for polymerising dienes and monoethylenically unsaturated copolymerizable monomers in the presence of these particular xanthogen disulphides and to vulcanisable rubber mixtures consisting of an uncross-linked benzene soluble chloroprene homopolymer or copolymer which is prepared in the presence of said xanthogen disulphides.Type: GrantFiled: April 21, 1975Date of Patent: May 4, 1976Assignee: Bayer AktiengesellschaftInventors: Rudolf Mayer-Mader, Wilhelm Gobel -
Patent number: RE30090Abstract: Process for the polymerization of vinyl chloride or the copolymerization of vinyl chloride and vinyl acetate at temperatures of less than about 70.degree. C., in the presence of a polymerization initiator which is a blend of an acetyl alkylsulfonyl peroxide with (A) a peroxydicarbonate, (B) a diacyl peroxide and a tertiary-alkyl neoacid peroxyester or (C) a diacyl peroxide and a peroxydicarbonate. .Iadd.Type: GrantFiled: June 28, 1973Date of Patent: September 4, 1979Assignee: Pennwalt CorporationInventor: Rupert E. Light, Jr.
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Patent number: RE33377Abstract: Sulfur-modified polychloroprene in alkaline aqueous emulsion is prepared by incorporating one or more organic polysulfides which act as peptizing agents during the polymerization of the chloroprene. The sulfur-modified polychloroprenes obtained have stable viscosities.Type: GrantFiled: October 20, 1988Date of Patent: October 9, 1990Assignee: DistugilInventors: Paul Branlard, Jean-Pierre Merle