One Or More Sulfur Atoms Of The Nitrogen-containing Compound Are Double Bonded To Carbon Patents (Class 525/352)
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Patent number: 5466757Abstract: A chlorinated ethylene-propylene copolymer having a chlorine content of 20 to 45% by weight and a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 10 to 150 is produced by chlorinating in two or three stages, by contact with chlorine gas in an aqueous suspension, an ethylene-propylene copolymer having a propylene content of 15 to 40% by weight, a melt flow index of 0.01 to 5.0 g/10 minutes, a melting peak as measured by differential scan calorimeter (DSC) of 80.degree. C. or more, a crystallinity as measured by X-rays of 3% or more, an index M.sub.W /M.sub.N of the distribution of molecular wieght, determined by gel permeation chromatography (GPC), of greater than 4, and a Mooney visocisty (ML.sub.1+4, 100.degree. C.) of 10 to 180.Type: GrantFiled: December 11, 1991Date of Patent: November 14, 1995Assignee: Showa Denko Kabushiki KaishaInventors: Naotoshi Watanabe, Tsuyoshi Masukawa, Kenji Ozaki, Noboru Moriwaki
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Patent number: 5416167Abstract: Vulcanizable rubber compositions are disclosed which contain partial polycarboxylic acid esters or their salts. Vulcanizates obtained from the compositions are readily processible and are found to have reduced compression set and high tension values, in particular after ageing by heat.Type: GrantFiled: May 3, 1994Date of Patent: May 16, 1995Assignee: Bayer AktiengesellschaftInventors: Joachim Thormer, Thomas Scholl, Hans-Wilhelm Engels
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Patent number: 5399633Abstract: The emission of the highly toxic volatile products, such as methyl bromides or iodides, or ethyl bromides or iodides, during the cure with peroxides of fluoroelastomers containing bromine or iodine atoms is substantially reduced by adding to the cure mix small amounts of substances capable of combining with the radicals which give rise to the aforesaid toxic products, thereby preventing them from forming. This procedure does not sensibly affect the cure trend and results.Type: GrantFiled: August 29, 1994Date of Patent: March 21, 1995Assignee: Ausimont S.r.l.Inventors: Graziella Chiodini, Anna Minutillo
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Patent number: 5391635Abstract: A rubber composition which comprises(1) 100 parts by weight of a rubber containing 60 parts by weight or more of styrene-butadiene rubber,(2) 20 to 180 parts by weight of a softening agent,(3) 0.5 to 5 parts by weight of at least one member selected from the group consisting of a thiuram compound of the following formula, ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently selected from the group consisting of straight chain alkyl groups and branched chain alkyl groups having 7 to 12 carbon atoms, and a dithiocarbamate compound of the following formula, ##STR2## where R.sub.5 and R.sub.6 are independently selected from the group consisting of straight chain alkyl groups and branched alkyl groups having 7 to 12 carbon atoms, M is a divalent or higher valent metal and n is a number which is the same as the number of the valence of the metal M,(4) 0.1 to 2.5 parts by weight of a guanidine vulcanization accelerator, and(5) 0.5 to 5 parts by weight of a benzothiazole vulcanization accelerator.Type: GrantFiled: March 23, 1993Date of Patent: February 21, 1995Assignee: Bridgestone CorporationInventor: Kazuya Hatakeyama
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Patent number: 5385980Abstract: A curable halobutyl rubber/polyepihalohydrin rubber blend comprises a cure system consisting essentially of (a) sulfur, (b) sulfur accelerator, (c) zinc-containing promoter, (d) urea or urea derivative vulcanization accelerator and, optionally, (e) di- or tri-mercapto nonsulfur curative such as 2,4,6-trimercapto-1,3,5-triazine. The halobutyl rubber/polyepi-halohydrin rubber blends that are crosslinked with the cure system of this invention exhibit excellent scorch safety and cure rate, as well as a high degree of crosslinking, and are useful in the manufacture of tire inner tubes and inner liners.Type: GrantFiled: March 22, 1994Date of Patent: January 31, 1995Assignee: Zeon Chemicals U.S.A., Inc.Inventors: Ronald J. Schaefer, Vernon L. Kyllingstad
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Patent number: 5342900Abstract: Vulcanization of diene rubbers at a temperature of from 140.degree. to 200.degree. C. in the presence of 1 to 4.5 parts of a crosslinker having the formula ##STR1## wherein n denotes 2 or 6 and Bz denotes benzyl, in the simultaneous presence of a very small amount of sulfur and a small amount of a mercapto or sulfenamide accelerator or mixtures thereof affords elastomers having a previously unachieved outstanding ageing stability and reversion stability, after relatively short vulcanization times using economical amounts of chemicals while avoiding blooming phenomena in the vulcanizate.Type: GrantFiled: August 31, 1992Date of Patent: August 30, 1994Assignee: Huls AktiengesellschaftInventors: Jurgen Wolpers, Dieter Zerpner, Karl-Heinz Nordsiek
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Patent number: 5334666Abstract: A vulcanizable elastomer composition comprising an epoxy group-containing elastomer, and blended therewith(1) an organic compound having at least two bonds of the formula --C(X)'NH--C(Y)--, wherein X and Y are both oxygen or sulfur, or one of X and Y is oxygen and the other is sulfur, in the molecule,(2) a quaternary compound selected from quaternary ammonium salts and quaternary phosphonium salts, andoptionally, (3) a compound having one >N--C(Z)--N<bond wherein Z represents an oxygen or sulfur.Type: GrantFiled: April 23, 1993Date of Patent: August 2, 1994Assignee: Nippon Zeon Co., Ltd.Inventor: Shigelu Yagishita
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Patent number: 5332787Abstract: A process is provided for vulcanizing a halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene utilizing a vulcanization mixture comprising a basic zinc carbonate hydroxide.Type: GrantFiled: November 30, 1992Date of Patent: July 26, 1994Assignee: Exxon Chemical Patents Inc.Inventor: Irwin J. Gardner
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Patent number: 5326828Abstract: The current invention relates to the use of tetrabenzylthiuram disulfide/urea curative package for thermosetting rubber elastomers in an environmentally sound method of eliminating undesirable nitrosamines. The unique curative package synergistically increases the cure rate and physical properties of the elastomeric compound while reducing the amount of accelerator needed for vulcanization.Type: GrantFiled: October 9, 1992Date of Patent: July 5, 1994Assignee: Uniroyal Chemical Company, Inc.Inventors: Donald G. Rowland, David T. Faiman, Thomas L. Jablonowski
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Patent number: 5296555Abstract: Rubber compositions are disclosed which are tailored to exhibit high adhesion to brass, sufficient resistance to heat and to oil and great elasticity. A selected class of highly hydrogenated acrylonitrile copolymer rubbers are blended with specified amounts of a selected class of trially isocyanurate compounds, organic sulfur-containing compounds or sulfur donors and organic peroxides. Also disclosed is a hose built with an inner tube formed from the above rubber composition and a reinforcing layer from a pressure-resistant, metallic wire plated with brass.Type: GrantFiled: May 27, 1993Date of Patent: March 22, 1994Assignee: The Yokohama Rubber Co., Ltd.Inventor: Osamu Ozawa
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Patent number: 5248736Abstract: There are provided a process for producing a diene polymer having markedly improved tensil strength and wear resistance and further having improved heat build-up, refound resilience, processability and wet skid resistance, as well as a rubber composition containing said diene polymer and having improved tensil strength, wear resistance, etc. Said diene polymer is produced by polymerizing a conjugated diene monomer or a mixture of the conjugated diene monomer and an aromatic vinyl monomer in a hydrocarbon solvent using a composite initiator containing an alkaline earth metal, and reacting active ends of the obtained active diene polymer with (a) a compound represented by the formula M.dbd.C.dbd.M (wherein M denotes an oxygen atom or a sulfur atom) or (b) N-substituted aminoketone, N-substituted thioaminoketone, N-substituted aminoaldehyde, N-substituted thioaminoaldehyde or a compound having an atomic group in a molecule represented by the formula --C(.dbd.M)--N< in a molecule.Type: GrantFiled: March 13, 1992Date of Patent: September 28, 1993Assignee: Nippon Zeon Co., Ltd.Inventors: Fumitoshi Suzuki, Yoshihiro Chino
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Patent number: 5191028Abstract: A rubber composition containing 100 parts by weight of a diene rubber material, 0.5 to 2.0 parts by weight of N-cyclohexyl-2-benzothiazyl sulfenamide, and 0.02 to 1.0 part by weight of a condensation product of n-butylaldehyde and aniline. Further disclosed is another rubber composition containing 100 parts by weight of a diene rubber material, 1.5 to 2.5 parts by weight of N-cyclohexyl-2-benzothiazyl sulfenamide, 0.02 to 1.0 part by weight of a condensation product of n-butylaldehyde and aniline, and 0.3 to 1.5 part by weight of tetrabutylthiuram disulfide.Type: GrantFiled: August 26, 1991Date of Patent: March 2, 1993Assignee: Tokai Rubber Industries, Ltd.Inventor: Yutaka Ishioka
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Patent number: 5082903Abstract: Acrylic elastomer obtained by copolymerization of an epoxy group-containing vinyl monomer and an .alpha.,.beta.-unsaturated carboxylic acid aryl ester can produce vulcanization products having good compression set and heat resistance when vulcanized together which (1) a cyanuric acid and (2) a quaternary ammonium salt or phosphonium salt as cross-linking agents without secondary vulcanization.Type: GrantFiled: June 26, 1990Date of Patent: January 21, 1992Assignee: Nippon Miktron LimitedInventor: Kazuma Yokoi
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Patent number: 5075385Abstract: A vulcanizable elastomer composition is prepared by blending 100 parts by weight of a copolymer containing(A) 50-85% by mole of ethylene unit,(B) 10-45% by mole of an alkyl acrylate unit having the formula (I), ##STR1## wherein R.sub.1 is an alkyl having 1-8 carbon atoms, (C) 2-35% by mole of an alkoxyalkyl acrylate unit having the formula (II), ##STR2## wherein R.sub.2 is hydrogen or methyl, R.sub.3 is an alkylene having 1-4 carbon atoms, and R.sup.4 is an alkyl or alkoxyalkyl, each having 1-4 carbon atoms, and(D) up to 5% by mole of a glycidyl ester unit having the formula (III), ##STR3## wherein R.sup.5 is hydrogen or methyl, and 0.1-10 parts by weight of at least one vulcanizing agent.The vulcanizable composition can give vulcanizates of well-balanced properties having an improved low-temperature resistance and retaining excellent oil resistance.Type: GrantFiled: December 4, 1990Date of Patent: December 24, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Nobuyuki Yoshida, Hisao Tanaka, Masahiro Fukuyama
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Patent number: 5039756Abstract: A vulcanizable epoxy group-containing elastomer composition is disclosed, which comprises:(A) an epoxy group-containing elastomer having compounded therewith(B) an organic compound having at least two linkages, per molecule, of the formula ##STR1## wherein X and Y are each oxygen atom or sulfur atom, or one of X and Y is oxygen atom and the other is sulfur atom;(C) a quaternary ammonium salt and/or a quaternary phosphonium salt;(D) a compound having one linkage, per molecule, of the formula ##STR2## wherein Z is oxygen atom or sulfur atom; and (E) calcium oxide or a combination of calcium oxide and calcium hydroxide.Type: GrantFiled: July 7, 1989Date of Patent: August 13, 1991Assignee: Sumitomo Chemical Co., Ltd.Inventors: Keisaku Yamamoto, Nobuyuki Yoshida, Masahiro Fukuyama, Masahiro Ichinose
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Patent number: 4997886Abstract: A novel fluorine-containing polymeric compound represented by the general formula--CH.sub.2 --CH(CH.sub.2 --NH.sub.2)].sub.m-n --CH.sub.2 --CH(CH.sub.2 --NH--CS--NH--Pn--OCH.sub.2 Rf)].sub.n,in which Rf is a perfluoroalkyl group having 6 to 15 carbon atoms, Pn is a 1,2- or 1,4-phenylene group, m is a positive integer in the range from 10 to 1500, n is a positive integer not exceeding m, is prepared by the reaction of one mole of a polyallylamine of the formula--CH.sub.2 --CH(CH.sub.2 --NH.sub.2)].sub.m,in which m has the same meaning as defined above, with n moles of a 2- or 4-(perfluoroalkylmethoxy)phenyl isothiocyanate represented by the general formulaRfCH.sub.2 O--Pn--NCS,in which Rf and Pn each have the same meaning as defined above. Despite the high fluorine content, the polymer is soluble in at least one kind of organic solvents so that Langmuir-Blodgett's films can be prepared from a solution of the polymer.Type: GrantFiled: March 1, 1990Date of Patent: March 5, 1991Assignee: Japan as represented by Director General of Agency of Industrial Science and TechnologyInventors: Akira Sekiya, Masanori Tamura
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Patent number: 4985507Abstract: A vulcanizable elastomer composition is prepared by blending100 parts by weight of a copolymer containing(A) 50-85% by mole of ethylene unit,(B) 10-45% by mole of an alkyl acrylate unit having the formula (I), ##STR1## wherein R.sub.1 is an alkyl having 1-8 carbon atoms, (C) 2-35% by mole of an alkoxyalkyl acrylate unit having the formula (II), ##STR2## wherein R.sub.2 is hydrogen or methyl, R.sub.3 is an alkylene having 1-4 carbon atoms, and R.sub.4 is an alkyl or alkoxyalkyl, each having 1-4 carbon atoms, and(D) up to 5% by mole of a glycidyl ester unit having the formula (III), ##STR3## wherein R.sup.5 is hydrogen or methyl, and 0.1-10 parts by weight of at least one vulcanizing agent.The vulcanizable composition can give vulcanizates of well-balanced properties having an improved low-temperature resistance and retaining excellent oil resistance.Type: GrantFiled: May 15, 1989Date of Patent: January 15, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Nobuyuki Yoshida, Hisao Tanaka, Masahiro Fukuyama
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Patent number: 4965323Abstract: A rubber composition comprising a nitrile group-containing hydrocarbon rubber and a vulcanizing system, characterized in that the iodine value of said rubber does not exceed 120 and the pH of the tetrahydrofuran solution of said rubber is at least 5.Type: GrantFiled: June 1, 1987Date of Patent: October 23, 1990Assignee: Nippon Zeon Co., Ltd.Inventors: Noboru Watanabe, Yoichiro Kubo
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Patent number: 4956419Abstract: This invention provides fluorine-containing polymers having a plurality of thioorgano groups. These polymers are prepared by reacting a fluoropolymer precursor with one or more, organic, thiolate compounds thereby modifying the fluoropolymer precursor by grafting onto its backbone the thioorgano groups. Said thioorgano groups may contain functional moieties that modify the cure properties, bulk properties or compatibility of the thioorgano fluoropolymer precursor. This invention also provides shaped or formed cured articles, coatings and solutions comprising the thioorgano fluoropolymers, and blends thereof with other compatible polymers.Type: GrantFiled: November 20, 1989Date of Patent: September 11, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert E. Kolb, Paul F. Tuckner, Richard A. Guenthner
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Patent number: 4946593Abstract: A rubber composition for use with potable water is disclosed. The composition is based on butyl rubber. The accelerator system is carbamate-free and the composition preferably includes coal-derived carbon black. Improvements in processing are also disclosed.Type: GrantFiled: August 29, 1989Date of Patent: August 7, 1990Assignee: Acushnet CompanyInventor: Edward P. Pinigis
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Patent number: 4910267Abstract: An anti-degrading rubber article to be used in contact with a mineral oil containing an oil modifier, at least that surface of said rubber article which is to come into contact with said mineral oil being composed substantially of a vulcanization product, obtained by using a sulfur vulcanization system, of a copolymer rubber having polymer chains consisting of(1) 10 to 60% by weight of units derived from an unsaturated nitride,(2) 2 to 30% by weight of units derived from a conjugated diene, and(3) 88 to 10% by weight of units derived from a copolymerizable ethylenically unsaturated monomer other than the unsaturated nitride and/or units resulting from the hydrogenation of units derived from a conjugated diene.Type: GrantFiled: February 10, 1988Date of Patent: March 20, 1990Assignee: Nippon Zeon Co., Ltd.Inventors: Motofumi Oyama, Yoichiro Kubo, Toshiharu Honda
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Patent number: 4906706Abstract: A process for producing a modified conjugated diene polymer which comprises the steps of (I) polymerizing a conjugated diene in an inert organic solvent in the presence of a catalyst comprising (a) a lanthanum series rare earth element compound, (b) an organoaluminum compound represented by the general formula, Alr.sup.1 R.sup.2 R.sup.3 (wherein R.sup.1, R.sup.2 and R.sup.3 which may be same or different, are hydrogen atoms or hydrocarbon groups of 1 to 8 carbon atoms and at least one of R.sup.1, R.sup.2 and R.sup.3 is said hydrocarbon group) and, if necessary, at least one member selected from the group consisting of (c) a Lewis acid and/or (d) a Lewis base, and then (II) modifying the resulting reactive polymer with a modifying compound selected from the group consisting of the following components (e), (f) and (g): (e) an organometal halide compound represented by the general formula, R.sub.n .sup.4 MX.sub.4-n (wherein R.sup.Type: GrantFiled: August 28, 1987Date of Patent: March 6, 1990Assignee: Japan Synthetic Rubber Co., Ltd.Inventors: Iwakazu Hattori, Mitsuhiko Sakakibara, Fumio Tsutsumi, Masao Yoshizawa
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Patent number: 4879076Abstract: A process for producing polyethylene materials is disclosed in which particulate polyethylene is drawn at lower temperatures than its melting point, the polymer having an intrinsic viscosity of 5-50 dl/g at 135.degree. C. in decalin and resulting from the polymerization of ethylene at temperatures below the above melting point and with use of a selected catalyst. The polyethylene materials excel in mechanical strength and elastic modulus.Type: GrantFiled: June 12, 1987Date of Patent: November 7, 1989Assignee: Nippon Oil Co., Ltd.Inventors: Akira Sano, Seizo Kobayashi, Kazuo Matsuura, Shigeki Yokoyama, Takeshi Kamiya
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Patent number: 4866150Abstract: Various acrylamide/allyl thiourea polymers and their use as depressants in the beneficiation of sulfide minerals from ores are disclosed.Type: GrantFiled: April 18, 1988Date of Patent: September 12, 1989Assignee: American Cyanamid CompanyInventors: David W. Lipp, D. R. Nagaraj
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Patent number: 4824914Abstract: It is often desirable to utilize accelerators in the sulfur vulcanization of unsaturated rubbers. In many cases a primary accelerator is used in combination with another accelerator, called a secondary accelerator or activator, which further increases the rate of vulcanization. It has been determined that compounds having the structural formula:NH.sub.2 --A[NH--(CH.sub.2).sub.x NH].sub.n A--NH.sub.2wherein x is 2 or 3, wherein n is an integer from 1 to 100, and wherein A represents an alkylene group containing from 1 to 20 carbon atoms, act as secondary accelerators in the vulcanization of unsaturated rubbers. For example, it has been determined that 4,7-diaza-decane-1,10-diamine is a particularly desirable secondary accelerator.Type: GrantFiled: September 14, 1987Date of Patent: April 25, 1989Assignee: The Goodyear Tire & Rubber CompanyInventor: Paul H. Sandstrom
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Patent number: 4806393Abstract: To plasticized polyvinyl chloride (PVC) there is applied a layer of PVC modified by the introduction of functional groups which can be crosslinked, preferably under the influence of heat. Such crosslinking provides a thin coating which prevents leakage of plasticizer and additives from the plasticized PVC substrate when it is contacted with solvents. Preferred modification of the PVC is by means of thiocarbamate moieties replacing some of the chlorine in the PVC from which the surface layer is produced.Type: GrantFiled: March 25, 1987Date of Patent: February 21, 1989Assignee: Yeda Research and Development Company LimitedInventor: Gideon Levin
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Patent number: 4794146Abstract: An oil-soluble additive for lubricating oil applications is provided by the formation of an adduct of thiocyanogen halide and polyalkene, removal of the hydrogen halide from said adduct and thermal rearrangement of the product to provide a polyalkenyl isothiocyanate which can be subsequently derivitized to provide a thiocarbamyl moiety containing product having excellent sludge dispersement properties.Type: GrantFiled: August 20, 1987Date of Patent: December 27, 1988Assignee: Exxon Research & Engineering Co.Inventors: Stanley J. Brois, Antonio Gutierrez
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Patent number: 4791173Abstract: A synthetic rubber (SR) tire tread of styrene-butadiene rubber (SBR) and butyl rubber which SR is essentially free of natural rubber (NR), upon vulcanization with sulfur in the presence of a combination of sulfenamide accelerators, provides excellent oxidative stability, resistance to hardening, and flex resistance, despite increasing the level of sulfur to an amount in the range from 2.0-3.0 phr, as long as the total amount of sulfenamide accelerators is less than 2.0 phr and there is more TCS than BTS. The crosslink network generated by the use of TCS in combination with BTS, which combination produces poor oxidation stability in a predominantly NR containing rubber, is not produced in SR.Type: GrantFiled: July 17, 1987Date of Patent: December 13, 1988Assignee: The B F Goodrich CompanyInventor: Robert W. Layer
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Patent number: 4764565Abstract: Adhesiveness of a halogenated butyl rubber is improved by blending with it from 5 to 20 weight parts of nickel dithiocarbamate, such as nickel butyl- or diethyldithiocarbamate, per 100 weight parts of the rubber.Type: GrantFiled: February 22, 1985Date of Patent: August 16, 1988Assignee: Toyoda Gosei Co., Ltd.Inventors: Tadanobu Iwasa, Katsumasa Takeuchi, Toshikatsu Kanehara
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Patent number: 4755379Abstract: Anticoagulant products are constituted by polymers (homopolymers or copolymers) including in their chain substitutable groups on which are fixed statistically, groups X and/or Y and/or V, where X denotes the group --SO.sub.3 R.sub.1 or --R.sub.3 --SO.sub.3 R.sub.1, R.sub.1 being a hydrogen atom or a physiologically compatible metal, R.sub.3 being a --CH.sub.2 --CO--NH--R.sub.4 group in which R.sub.4 represensts an alkyl aryl or alkylaryl radical, which may or may not be substituted, or substituted or unsubstituted --CH.sub.2 --; Y denotes the group --SO.sub.2 --R.sub.2 or --R.sub.3 --SO.sub.2 --R.sub.2, R.sub.2 being the residue of an amino acid connected to the --SO.sub.2 bridge through its amine function and V denotes the group --CH.sub.2 --CO--NH--CHR--COOH, R being the side chain of an amino acid it being understood that: (a) if X is --SO.sub.3 R.sub.1 it is necessarily accompanied by Y and/or by V, and (b) V is always accompanied by X and/by Y.Type: GrantFiled: September 27, 1985Date of Patent: July 5, 1988Assignees: Jacqueline Jozefonvicz, Marcel Jozefonvicz, Christine FougnotInventors: Marcel Jozefonvicz, Jacqueline Jozefonvicz, Christine Fougnot, Monique Mauzac
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Patent number: 4717754Abstract: An oil-soluble additive for lubricating oil applications is provided by the formation of an adduct of thiocyanogen halide and polyalkene, removal of the hydrogen halide from said adduct and thermal rearrangement of the product to provide a polyalkenyl isothiocyanate which can be subsequently derivitized to provide a thiocarbamyl moiety containing product having excellent sludge dispersement properties.Type: GrantFiled: September 18, 1986Date of Patent: January 5, 1988Assignee: Exxon Research & Engineering Co.Inventors: Stanley J. Brois, Antonio Gutierrez
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Patent number: 4695609Abstract: A novel mixture comprises a dihydrocarbyl xanthogen polysulphide and a xanthate selected from metal hydrocarbylxanthates and dihydrocarbylxanthates. Such a mixture can be used to cure a vulcanizable rubber composition containing less than 0.4 parts by weight of nitrosatable materials per 100 parts by weight rubber; the use of toxic conventional nitrogen-containing accelerators such as amines can be avoided.Type: GrantFiled: October 22, 1985Date of Patent: September 22, 1987Assignee: Robinson Brothers LimitedInventor: Arthur Stevenson
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Patent number: 4673741Abstract: The invention is directed to bis-(2-ethylamino-4-diethylamino-s-triazine-6-yl)-tetrasulfide and a process for its production from the corresponding mercaptotriazine. The compound of the invention is employed in vulcanizable mixtures as a cross-linker or as vulcanization accelerator.Type: GrantFiled: April 22, 1986Date of Patent: June 16, 1987Assignee: Degussa AGInventors: Werner Schwarze, Siegfried Wolff, Hans Remmel, Horst Lambertz
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Patent number: 4647625Abstract: A process for modifying a polymer of a conjugated diene, which comprises reacting a polymer of a conjugated diene containing at least one metal selected from alkali metals and alkaline earth metals with a compound having a linkage of the following formula ##STR1## wherein X represents an oxygen or sulfur atom, in the molecule.Type: GrantFiled: December 21, 1984Date of Patent: March 3, 1987Assignee: Nippon Zeon Co., Ltd.Inventors: Mitsuyoshi Aonuma, Hiroyuki Watanabe, Haruki Kawada, Kohkichi Noguchi, Akio Ueda, Shuichi Akita, Tetsuo Ohyama, Toshio Kase
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Patent number: 4631316Abstract: A compound of the formulaR.sup.1 --NHC(O)NHSC(S)NR.sup.2 R.sup.3wherein R.sup.1 is phenyl; phenyl substituted with halogen, alkyl, NR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 are the same or different and are hydrogen or alkyl; alkoxy, alkylthio, methylenedioxy, COOR.sup.6 wherein R.sup.6 is alkyl; or NHCOOR wherein R.sup.7 is alkyl; R.sup.2 and R.sup.3 are the same or different and are alkyl, cycloalkyl or aralkyl, and R.sup.2 plus R.sup.3 are alkylene, oxydialkylene or thiodialkylene.Type: GrantFiled: March 1, 1984Date of Patent: December 23, 1986Assignee: Uniroyal Chemical Company, Inc.Inventor: Joseph F. Stieber
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Patent number: 4613653Abstract: Polymers modified by reaction with thiocyano or isothiocyano generating reactants provide improved adhesive strength to laminates prepared therefrom, improved paint adhesion, increased viscosity and alterated gas permeability compared to unmodified polymers.Type: GrantFiled: March 20, 1985Date of Patent: September 23, 1986Assignee: The Dow Chemical CompanyInventors: John D. Kitchens, Leo R. Novak
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Patent number: 4594396Abstract: A cure system for halogen-containing polymers that comprises a thiourea derivative, a thiuram sulfide and an inorganic base yields stable cross-linked products with useful properties when incorporated into normal vulcanization procedures.Type: GrantFiled: December 5, 1984Date of Patent: June 10, 1986Assignee: Hercules IncorporatedInventor: Dominick A. Berta
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Patent number: 4591617Abstract: Disclosed are crosslinking compositions having both sulfur and nonsulfur curative systems which are particularly adapted for crosslinking rubber blends of (a) from about 35% to about 85% halobutyl rubber or a mixture of butyl rubber and halobutyl rubber wherein the halobutyl rubber is at least 50% by weight of the mixture and (b) from about 15% to about 65% of an epihalohydrin rubber, and to the rubber materials crosslinked therewith. The rubber materials crosslinked with these crosslinking compositions have an excellent balance of cure rate, cure state and scorch safety; have improved tire carcass adhesion and good impermeability to gases; and are useful in tire inner tubes and inner liners.Type: GrantFiled: January 14, 1985Date of Patent: May 27, 1986Assignee: Hercules IncorporatedInventor: Dominic A. Berta
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Patent number: 4575531Abstract: Sulfur vulcanizable partially hydrolyzed ethylene-vinyl acetate terpolymers and processes for producing these products are disclosed.Type: GrantFiled: November 7, 1984Date of Patent: March 11, 1986Assignee: National Distillers and Chemical CorporationInventors: John M. Hoyt, Steven D. Blazey
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Patent number: 4567241Abstract: Solid polymers having thiocyanate or isothiocyanate functionality added to reactive unsaturation thereof provide improved adhesive strength to laminates prepared therefrom, improved paint adhesion and other properties.Type: GrantFiled: March 20, 1985Date of Patent: January 28, 1986Assignee: The Dow Chemical CompanyInventors: John D. Kitchens, Leo R. Novak
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Patent number: 4559390Abstract: A method of preventing degradation of vulcanized rubber materials used in the operation of oil and gas wells comprising forming said rubber material from a sulfur vulcanized composition comprising a copolymer rubber having in the polymer chain (I) 10 to 60% by weight of a unit from an unsaturated nitrile, (II) not more than 10% by weight of a unit from a conjugated diene, and (III) 30 to 90% by weight of a unit from an ethylenically unsaturated monomer other than the unsaturated nitrile and/or a unit resulting from the hydrogenation of a unit from a conjugated diene, said rubber being vulcanized with a sulfur vulcanization system.Type: GrantFiled: June 7, 1984Date of Patent: December 17, 1985Assignee: Nippon Zeon Co., Ltd.Inventors: Noboru Watanabe, Motofumi Oyama, Yoichiro Kubo
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Patent number: 4558102Abstract: A curable rubber composition composed of a halogen-containing rubber and at least one member selected from the group consisting of a vulcanizing agent and a vulcanization accelerator other than thiazole-type vulcanization accelerators is cured under heat in the presence of, as an acid acceptor, a calcinated product of a hydrotalcite compound of the following formulaM.sub.x.sup.2+ Al.sub.2 (OH).sub.2x+6-nz (A.sup.n-).sub.z.mH.sub.2 O (1)wherein M.sup.2+ represents at least one metal element selected from the group consisting of Mg and Zn, A.sup.n- represents an anion having a valence of n, m represents a positive number, and x and z represent positive numbers satisfying the following expressions12>x.gtoreq.2,z.ltoreq.2.The cured product has improved water resistance.Type: GrantFiled: August 1, 1984Date of Patent: December 10, 1985Assignee: Kyowa Chemical Industry Co., Ltd.Inventor: Shigeo Miyata
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Patent number: 4524185Abstract: The properties of halogen-containing elastomers are improved by incorporating into the elastomer before vulcanization from about 0.05 to about 3 parts by weight of dimercaptothiodiazole (DMTD), and from about 0.5 to about 5 parts by weight of a dithiocarbamate type accelerator per 100 parts of elastomer. Zinc di-n-butyldithiocarbamate and dimercaptothiodiazole in acrylic elastomers containing active chlorine is disclosed as a preferred combination.Type: GrantFiled: March 7, 1983Date of Patent: June 18, 1985Assignee: Federal-Mogul CorporationInventor: Robert F. Hinderer
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Patent number: 4464511Abstract: Polymers which have two or more stable, reversibly interconvertible oxidation states with half-wave potentials E.sub.1/2 of from -1.5 to +1 V, and which are obtained when a polymer having a reactive side group is reacted with a 1,9-substituted phenalene, are useful for producing electrically conductive systems, in the electrical industry, and for converting and fixing radiation, for producing electric switches, as electrochromic displays, for providing an antistatic finish on plastics and as reversible redox systems.Type: GrantFiled: July 1, 1982Date of Patent: August 7, 1984Assignee: BASF AktiengesellschaftInventors: Herbert Naarmann, Klaus Penzien, Volker Muench, Klaus-Dieter Franz
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Patent number: 4434274Abstract: Dual cure site acrylate elastomers containing both active halogen and carboxyl groups are compounded with a combination of 2,5-dimercapto-1,3,4-thiadiazole, a Group IVA metal oxide or salt thereof and a tetraalkyl thiuram sulfide to provide compounds having an excellent scorch/cure rate balance and balance of desirable physical properties in the vulcanizates thereof.Type: GrantFiled: April 12, 1982Date of Patent: February 28, 1984Assignee: The B. F. Goodrich CompanyInventor: Dane E. Jablonski
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Patent number: 4433106Abstract: Vulcanizable, elastomeric, sulphur-modified polychloroprene rubbers having improved properties are obtained by adding up to 40%, by weight, of SBR latex (solids, based on total solids) before working-up and before or after peptization.Type: GrantFiled: October 25, 1982Date of Patent: February 21, 1984Assignee: Bayer AktiengesellschaftInventors: Rudiger Musch, Wolfgang Konter, Wilhelm Gobel
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Patent number: 4433114Abstract: Improved tack, green strength or non-black filler interaction capability are realized in a treated diene rubber. The method of treating diene rubber to achieve the improvements is shown, together with a composition in which maleamic acid or derivatives of maleamic acid are combined with sulfur or an organic sulfur compound capable of generating a thiyl radical.Type: GrantFiled: May 20, 1982Date of Patent: February 21, 1984Assignee: Monsanto CompanyInventors: Aubert Y. Coran, Chester D. Trivette, Jr.
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Patent number: 4426489Abstract: Substantially linear, synthetic, water-soluble or water-dispersible cationic interpolymeric surfactants which are particularly useful for reducing the surface tension of an aqueous medium; such surfactants having a critical micelle concentration of from 0.01 to about 10 percent in water at 25.degree. C.Type: GrantFiled: June 10, 1981Date of Patent: January 17, 1984Assignee: The Dow Chemical CompanyInventors: Ritchie A. Wessling, Dale M. Pickelman
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Patent number: 4404329Abstract: A rubber composition comprising (1) a partially hydrogenated copolymer rubber composed of 10 to 50% by weight of an acrylonitrile unit, 25 to 88% by weight of a hydrogenated conjugated diene unit and 2 to 25% by weight of a conjugated diene unit, and (2) a sulfur vulcanizer system. The composition can give vulcanizates having improved ozone cracking resistance and oil resistance.Type: GrantFiled: June 10, 1980Date of Patent: September 13, 1983Assignee: Nippon Zeon Co., Ltd.Inventors: Akio Maeda, Kinro Hashimoto, Shigelu Yagishita, Masaaki Inagami, Hiroshi Fukushima
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Patent number: 4317265Abstract: Electrically conductive elastomers are prepared by adding polyfunctional tertiary amine compounds to halogenated polymers. The resulting elastomers have resistivities in the range that makes them suitable as conductors for many electrical and electrostatic applications. These ranges are generally in the area of 1.times.10.sup.3 to 1.times.10.sup.7 ohm cm as measured by the methods of ASTM 257. A preferred elastomer is prepared by adding a polyfunctional tertiary amine such as N,N,N',N' tetramethyl-1,3-butanediamine to polychloroprene prior to vulcanizing under conventional vulcanization conditions. The resulting elastomers possess useful electrical conductivity, as well as the desirable physical and chemical properties of conventional elastomers. A roller for current-assisted printing or electrostatic-assisted printing having an external surface layer comprised of the novel electrically conductive elastomer is described.Type: GrantFiled: January 31, 1980Date of Patent: March 2, 1982Assignee: American Roller CompanyInventors: Thomas G. Chase, Steven Poniatowski