Fluorine Containing Monomer Contains At Least One Diverse Halogen Atom Patents (Class 526/249)
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Patent number: 4450263Abstract: A fluoropolymer gum of 60 to 85 mol percent vinylidene fluoride, 10 to 40 mol percent of hexafluoropropene and 0.15 to 3 mol percent 1-bromo-2,2-difluoroethylene is provided which can be blended with fluorosilicone gum and vulcanized in presence of free-radical initiators to produce elastomeric vulcanizates with desired balance of chemical solvent or fluid resistance, high temperature stability, and low temperature flexibility, coupled with good physical properties such as high tensile strength and elongation.Type: GrantFiled: August 29, 1980Date of Patent: May 22, 1984Assignee: Minnesota Mining and Manufacturing CompanyInventor: Arthur C. West
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Patent number: 4438247Abstract: Regioregular polyfluoroethylenes are produced by a specific set of reaction steps. A precursor polymer for the regioregular polyfluoroethylene is produced by using the monomer typically employed for producing the particular polyfluoroethylene and introducing a blocking group such as a chlorine atom. Polymerization of such fluoroethylenes with blocking groups to polyfluoroethylenes produces a corresponding regioregular precursor polymer. The blocking group is then replaced by a hydrogen with a reagent such as an alkyltin hydride. The resulting polymer is the desired polyfluoroethylene which has a regioregularity.Type: GrantFiled: February 19, 1982Date of Patent: March 20, 1984Assignee: Bell Telephone Laboratories, IncorporatedInventor: Rudolf E. Cais
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Patent number: 4426501Abstract: Copolymerization in aqueous emulsion of ethylene with one or two comonomers having different water solubilities is more efficient when at least two but no more than three comonomer solubility-affecting additives are present in the copolymerization medium, at least one of which increases the solubility in water of one of the comonomers, while at least another one decreases the solubility in water of another comonomer. In this manner, the diffusion rates of comonomers to the copolymerization locus are well controlled; the rate of polymerization often is increased; the concentrations of the comonomers at the copolymerization locus remain constant; and the copolymer composition remains constant. This process improvement can be applied to the copolymerization of many comonomer combinations of great commercial interest, including, for example ethylene/tetrafluoroethylene and ethylene/ethyl acrylate copolymerizations.Type: GrantFiled: January 17, 1983Date of Patent: January 17, 1984Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ausat A. Khan
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Patent number: 4387204Abstract: The invention relates to a polymerizable and self-crosslinkable composition of monomers having olefinic unsaturation and, if desired, conventional additives, said composition containing(a) 1 to 99.9% by weight of at least one ethylene or propylene monomer which is substituted by polar groups or aromatic hydrocarbon groups, and(b) 99 to 0.1% by weight of an acrylate or methacrylate of monohydric or dihydric, mononuclear or binuclear phenols which are substituted by allyl, methallyl or 1-propenyl groups, or hydroxyalkyl ethers thereof. The composition of the invention can be used as a casting or impregnating resin, adhesive, lacquer and binder, and it can be cured by irradiation and/or heat.Type: GrantFiled: March 30, 1981Date of Patent: June 7, 1983Assignee: Ciba-Geigy CorporationInventors: Abdul-Cader Zahir, Sameer H. Eldin
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Patent number: 4387203Abstract: A multi-component polymer rubber comprising (A) 15 to 60 mole % of an .alpha.,.beta.-unsaturated nitrile, (B) 10 to 75 mole % of a conjugated diene, and (C) 2 to 55 mole % of a fluoroalkyl acrylate or methacrylate or a fluorine-containing .alpha.-olefin, and having a glass transition temperature (T.sub.g) of -50.degree. C. to -20.degree. C., the percentages of the components (A), (B) and (C) being based on the total sum of moles of the components (A), (B) and (C). Said multi-component polymer rubber is excellent in sour gasoline resistance and alcohol-containing gasoline resistance.Type: GrantFiled: December 28, 1981Date of Patent: June 7, 1983Assignee: Japan Synthetic Rubber Co., Ltd.Inventors: Isao Furuta, Yasuhiko Takemura, Toshio Miyabayashi, Shinichiro Zen, Masato Sakai
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Patent number: 4381384Abstract: A continuous process for polymerizing tetrafluoroethylene alone or with selected comonomers to prepare a polymer which employs a perfluoroalkyl ethane sulfonic acid or its salt or a perfluoroalkyl ethane sulfate salt as dispersing agent.Type: GrantFiled: August 17, 1981Date of Patent: April 26, 1983Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ausat A. Khan
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Patent number: 4380618Abstract: In the batch process for copolymerizing tetrafluoroethylene and selected comonomers to prepare a copolymer thereof, the improvement which comprises employing a perfluoroalkylethane sulfonic acid or its salts as the dispersing agent.Type: GrantFiled: August 21, 1981Date of Patent: April 19, 1983Assignee: E. I. Du Pont de Nemours and CompanyInventors: Ausat A. Khan, Richard A. Morgan
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Patent number: 4292449Abstract: The reaction of a polyfluorocarbonyl compound such as a polyfluoroketone or polyfluorocarboxylic acid fluoride with fluoride ion and a polyfluoroallyl chloride, bromide or fluorosulfate produces a polyfluoroallyloxy compound, e.g., CF.sub.2 .dbd.CFCF.sub.2 OCF.sub.2 CF.sub.3. The polyfluoroallyloxy compounds copolymerize with ethylenically unsaturated monomers such as tetrafluoroethylene, chlorotrifluoroethylene or vinylidene fluoride to form polymers which are moldable, and in some cases electrically conducting or are water-wettable and dyeable.Type: GrantFiled: May 1, 1980Date of Patent: September 29, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Carl G. Krespan
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Patent number: 4278773Abstract: Easily dispersible compositions of(a) one part by weight of fluorocarbon resin,(b) from 1 to 10 parts by weight of a compound of the general formula ##STR1## in which R is C.sub.8 -C.sub.22 alkyl or alkenyl and R.sup.1 is hydrogen or hydroxyethyl, and(c) from 1 to 10 parts by weight of a compound of the general formulaR--(O--CH.sub.2 --CH.sub.2).sub.x --OHin which R is C.sub.8 -C.sub.22 alkyl or alkenyl and x is a number of from 15 to 50, preferably from 20 to 30.These compositions, which are prepared by melting the fluorocarbon resin together with the compounds (b) and (c), are readily dispersible in water and the obtained dispersions, which are stable to storage are used for the dirt-repelling finishing of textiles, leather or paper and as fiber conditioning compositions.Type: GrantFiled: February 22, 1979Date of Patent: July 14, 1981Assignee: Hoechst AktiengesellschaftInventors: Rolf Kleber, Lothar Jaeckel
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Patent number: 4275225Abstract: The reaction of a polyfluorocarbonyl compound such as a polyfluoroketone or polyfluorocarboxylic acid fluoride with fluoride ion and a polyfluoroallyl chloride, bromide or fluorosulfate produces a polyfluoroallyloxy carboxylic acid or ester, e.g., CF.sub.2 .dbd.CFCF.sub.2 OCF.sub.2 CF.sub.2 COOH. The polyfluoroallyloxy compounds copolymerize with ethylenically unsaturated monomers such as tetrafluoroethylene, chlorotrifluoroethylene or vinylidene fluoride to form polymers which are moldable, and in some cases electrically conducting or are water-wettable and dyeable.Type: GrantFiled: May 1, 1980Date of Patent: June 23, 1981Assignee: E. I. Du Pont de Nemours and CompanyInventor: Carl G. Krespan
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Patent number: 4256856Abstract: A cross-linked product of ethylene-hexafluoropropylene copolymer is a good elastic material and has excellent resistance to attack by uranium hexafluoride even at a high temperature. Components made of said copolymer exhibit surprisingly long life, when used in a uranium enrichment plant.Type: GrantFiled: August 15, 1977Date of Patent: March 17, 1981Assignees: Japan Atomic Energy Research Institute, Sugimoto Chemical Co. Ltd.Inventors: Masayuki Ito, Giro Okamoto, Sueo Machi, Kenzo Shirayama
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Patent number: 4243770Abstract: An easily cross linkable fluorine-containing polymer substantially comprising: (1) a polymeric chain comprising one or more polymer segments, of which at least one polymer segment consisting of units of vinylidene fluoride alone or of units of vinylidene fluoride and one or more of other fluoroolefins, and (2) at least one iodine atom liberated from an iodinated compound of the formula: RI.sub.x (wherein R is a saturated or unsaturated fluorohydrocarbon or chlorofluorohydrocarbon residue having 1 to 8 carbon atoms and x is an integer of 1 or 2 corresponding to the bonding valency of the residue R) in an amount of 0.Type: GrantFiled: April 7, 1978Date of Patent: January 6, 1981Assignee: Daikin Kogyo Co., Ltd.Inventors: Masayoshi Tatemoto, Takeshi Suzuki, Masayasu Tomoda, Yasuyoshi Furukawa, Yutaka Ueta
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Patent number: 4188349Abstract: Poly- or vinyl-ester resin compositions containing ethylenic unsaturation and susceptible to free radical polymerization may be further polymerized by contacting the with an initiating compound having the formula: ##STR1## wherein R.sub.1 is a substituted or unsubstituted aryl radical.Type: GrantFiled: June 21, 1977Date of Patent: February 12, 1980Assignee: ICI Americas Inc.Inventors: Kenneth H. Markiewitz, Alfred J. Restaino
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Patent number: 4151340Abstract: A fluorocopolymer is produced by copolymerizing a fluoroolefin and cyclohexyl vinyl ether in the presence of a polymerization initiator at -30.degree. to +150.degree. C. at a molar ratio of the fluoroolefin to cyclohexyl vinyl ether in charge of 95:5 to 5:95.Type: GrantFiled: January 17, 1978Date of Patent: April 24, 1979Assignee: Asahi Glass Company Ltd.Inventors: Masahiko Ichimura, Haruhisa Miyake, Shun-ichi Kodama, Michio Hisasue
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Patent number: 4150067Abstract: Metal-containing polymers, particularly useful as catalysts for chemical reactions involving unsaturated hydrocarbon molecules, conform with the general formula: ##STR1## IN WHICH X is hydrogen, halogen or a monovalent hydrocarbon radical, n is 0 or an integer from 1 to 6, Me is a transition metal, each ligand R is selected from hydrogen, halogen, a hydrocarbon radical or a radical comprising a carboxy, carbonyl, amino, ether or phosphorus group, p is an integer from 1 to (m-1), m being the highest valency of said metal Me, Y is hydrogen, an alkali metal or a monovalent hydrocarbon radical, P is a unit derived from at least one polymerizable mono- or poly-functional vinyl monomer, and a, b and c are numbers such that, for a sum (a+b+c) of 100, (a+b) is from 1 to 100, a/(a+b) is from 0.1 to 1, and c is from 0 to 99.Type: GrantFiled: November 1, 1977Date of Patent: April 17, 1979Assignee: Institut Francais du PetroleInventors: Francois Dawans, Didier Morel
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Patent number: 4144227Abstract: Novel sulfonated copolymers formed by copolymerization of a halogenated monomer containing at least one fluorine atom and a monomer of the formula ##STR1## wherein X is an electron attracting group activating the hydrogen atom in the .alpha.-position so that the hydrogen may be replaced with a sulfonic group and Y is selected from the group consisting of hydrogen, methyl and ethyl and their preparation, novel diaphragms made therefrom, a diaphragm cell equipped with a diaphragm made of said sulfonated copolymer and to a method of electrolysis.Type: GrantFiled: February 4, 1977Date of Patent: March 13, 1979Assignee: Oronzio de Nora Impianti Elettrochimici S.p.A.Inventors: Luigi Giuffre, Vittorio DE Nora, Placido Spaziante
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Patent number: 4134995Abstract: In a process for polymerization of tetrafluoroethylene with a copolymerizable modifier in an aqueous medium containing a polymerization initiator and a dispersant to produce a modified tetrafluoroethylene polymer containing 0.001 to 2 wt.% of the copolymerizable modifier based on the weight of the polymer, a process for producing the modified tetrafluoroethylene polymer characterized in that:(1) chlorotrifluoroethylene is used as said copolymerizable modifier,(2) at least 50 wt.% of the copolymerizable modifier to be incorporated into the polymer is introduced into the polymerization system after 70 wt.% of the polymer to be finally formed has been formed, and(3) after 90 wt.% of the polymer to be finally formed has been formed, the concentration of said copolymerizable modifier is maintained at at least 0.01 mol.% based on the total amount of tetrafluoroethylene and the modifier in the polymerization system.Type: GrantFiled: February 2, 1978Date of Patent: January 16, 1979Assignee: Daikin Kogyo Kabushiki KaishaInventors: Syozo Fumoto, Tetsuo Shimizu, Shigeru Ichiba
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Patent number: 4095019Abstract: Ethylenically unsaturated monomers susceptible to free radical polymerization may be polymerized by contacting the monomers with an initiating compound having the formula: ##STR1## wherein R.sub.1 is a substituted or unsubstituted aryl radical.Type: GrantFiled: April 5, 1976Date of Patent: June 13, 1978Assignee: ICI Americas Inc.Inventors: Kenneth H. Markiewitz, Alfred J. Restaino
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Patent number: 4080490Abstract: Metal-containing polymers, particularly useful as catalysts for chemical reactions involving unsaturated hydrocarbon molecules, conform with the general formula: ##STR1## IN WHICH X is hydrogen, halogen or a monovalent hydrocarbon radical, n is O or an integer from 1 to 6, Me is a transition metal, each ligand R is selected from hydrogen, halogen, a hydrocarbon radical or a radical comprising a carboxy, carbonyl, amino, ether or phosphorus group, p is an integer from 1 to (m-1), m being the highest valency of said metal Me, Y is hydrogen, an alkali metal or a monovalent hydrocarbon radical, P is a unit derived from at least one polymerizable mono-or polyfunctional vinyl monomer, and a, b and c are numbers such that, for a sum (a + b + c) of 100, (a + b) is from 1 to 100, a/(a + b) is from 0.1 to 1, and c is from 0 to 99.Type: GrantFiled: February 11, 1976Date of Patent: March 21, 1978Assignee: Institut Francais du PetroleInventors: Francois Dawans, Didier Morel
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Patent number: 4076929Abstract: A high molecular weight vinylidene fluoride polymer resin having improved melt flow properties and further characterized as having a bimodal molecular weight distribution, as measured by gel permeation chromatography, and a specified critical shear stress.Type: GrantFiled: October 30, 1975Date of Patent: February 28, 1978Assignee: Pennwalt CorporationInventor: Julius Eugene Dohany
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Patent number: 4058578Abstract: Modified tetrafluoroethylene dispersion polymers are prepared by polymerizing tetrafluoroethylene in the presence of perfluorinated vinyl ethers of the formula I ##STR1## as modification agent. The articles made from the polymers by paste-extrusion have improved mechanical and electrical properties even if the extrusion is carried out at a high reduction ratio and draw-off rate.Type: GrantFiled: September 29, 1976Date of Patent: November 15, 1977Assignee: Hoechst AktiengesellschaftInventors: Jurgen Kuhls, Thomas Martini, Alfred Steininger
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Patent number: 4054733Abstract: Ar-halo-ar(t-alkyl)styrenes, e.g., 2-chloro-4-(t-butyl)styrene, polymerize to form materials having unusually high temperature resistance. Additionally, compositions of such monomers, unsaturated polyesters and free-radical generating catalysts cure at lower temperatures and in less time than similar compositions containing conventional styrene monomers.Type: GrantFiled: June 16, 1976Date of Patent: October 18, 1977Assignee: The Dow Chemical CompanyInventors: Richard H. Hall, Daniel H. Haigh, Junior J. Lamson, Larry D. Yats
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Patent number: 4053445Abstract: Solutions of a copolymer of about 55 to 95 mol percent chlorotrifluoroethylene and about 45 to 5 mol percent ethylene in an organic solvent. The solutions may optionally contain an organic silane, preferably an aminosilane.Type: GrantFiled: November 1, 1976Date of Patent: October 11, 1977Assignee: Allied Chemical CorporationInventor: Stephen R. Schulze
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Patent number: 4041229Abstract: Polymers and copolymers of ##STR1## are disclosed, wherein X and X.sup.1 are halogen.Type: GrantFiled: November 8, 1976Date of Patent: August 9, 1977Assignee: Hooker Chemicals & Plastics CorporationInventor: Victor A. Pattison
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Patent number: 4035565Abstract: A novel fluoropolymer can be made by copolymerizing a small amount (e.g. about 0.5-3 mole %) of bromotrifluoroethylene or bromotetrafluorobutene with certain combinations of monomers comprising selected fluorine-containing compounds. A fluoropolymer composition useful in the manufacture of cured fluoropolymer articles can be made by mixing the resulting fluoropolymer or a closely related fluoropolymer with an organic peroxide such as a dialkyl peroxide, and preferably also adding a divalent metal oxide and/or hydroxide and a suitable coagent such as triallyl isocyanurate.Type: GrantFiled: March 27, 1975Date of Patent: July 12, 1977Assignee: E. I. Du Pont de Nemours and CompanyInventors: David Apotheker, Paul Joseph Krusic
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Patent number: 4033939Abstract: Stress-crack resistant terpolymers of from about 40 to 60 mol percent ethylene, about 60 to 40 mol percent of a halogenated comonomer selected from the group consisting of tetrafluoroetylene, chlorotrifluoroethylene and mixtures thereof and about 0.1 to 10 mol percent of a termonomer selected from the group consisting of 3,3,3-trifluoro-2-trifluoromethyl propene, a vinyl monomer which is free of telogenic activity and which provides a side chain having at least two carbon atoms, the side chain being aromatic or having its elements bonded by a single bond only, and mixtures thereof, and containing high and low molecular weight components such that: ##EQU1## WHEREIN X.sub.i represents the weight fraction of each high molecular weight component i;Mw represents the weight-average molecular weight of the terpolymer,Mw.sub.i represents the weight-average molecular weight of each component i, ##EQU2## WHEREIN X.sub.j represents the weight fraction of each low molecular weight component j;Mw.sub.Type: GrantFiled: January 19, 1976Date of Patent: July 5, 1977Assignee: Allied Chemical CorporationInventor: Stephen R. Schulze
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Patent number: 4032699Abstract: Thermally stable, fluoroelastomeric terpolymers of vinylidene fluoride, hexafluoropropene and chlorotrifluoroethylene in respective mol % composition of 55-70, 25-40 and 1-8 produce vulcanizates with improved fluid resistant properties and low temperature flexibility.Type: GrantFiled: September 15, 1975Date of Patent: June 28, 1977Assignee: Minnesota Mining and Manufacturing CompanyInventor: Arthur C. West, III
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Patent number: 4025709Abstract: A process for the polymerization of vinylidene fluoride H.sub.2 C=CF.sub.2 using a novel class of fluorinated emulsifiers having the general formula:R.sub.f --C.sub.2 H.sub.4 --SO.sub.3 Mwherein R.sub.f is a perfluorinated radical having 4 to 10 carbon atoms and M is an alkali metal such as lithium, sodium or potassium or an ammonium radical NH.sub.4.Type: GrantFiled: September 22, 1975Date of Patent: May 24, 1977Assignee: Produits Chimiques Ugine KuhlmannInventors: Jean Blaise, Edouard Grimaud
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Patent number: 4020253Abstract: Stress-crack resistant copolymers of from about 40 to 60 mol percent ethylene and 60 to 40 percent of a halogenated comonomer selected from the group consisting of tetrafluoroethylene and chlorotrifluoroethylene and mixtures thereof and containing high and low molecular weight components such that: ##EQU1## WHEREIN X.sub.i represents the weight fraction of each high molecular weight component i;Mw represents the weight-average molecular weight of the copolymer;Mw.sub.1 represents the weight-average molecular weight of each component i; ##EQU2## WHEREIN X.sub.j represents the weight fraction of each low molecular weight component j, andMw.sub.j represents the weight-average molecular weight of each component j, and0.1 .ltoreq. f .ltoreq. 0.95.Type: GrantFiled: April 2, 1975Date of Patent: April 26, 1977Assignee: Allied Chemical CorporationInventor: Stephen R. Schulze
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Patent number: 4015612Abstract: Hair styling compositions which have excellent holding characteristics at elevated humidity and impart a soft hand and natural sheen to hair comprising a solution of a film-forming polymer modified with a fluoroaliphatic radical containing compound are disclosed.Type: GrantFiled: April 26, 1974Date of Patent: April 5, 1977Assignee: Minnesota Mining and Manufacturing CompanyInventors: Frank J. Pavlik, Robert L. Hansen
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Patent number: 4007043Abstract: Method for achieving free radical initiated copolymerization of an addition monomer having pendant therefrom a strong donor group with an addition monomer having pendant therefrom a strong acceptor group. Copolymers prepared according to this method can be represented by the following formula: ##STR1## wherein R is hydrogen or methyl;R' is hydrogen or methyl;R" is hydrogen or methyl;R'" is selected from the group consisting of --NO.sub.2, halogen, --CN and --CF.sub.3 ;X and Y are independently selected from the group consisting of hydrogen, chlorine, bromine, alkyl of 1 - 4 carbon atoms and phenyl;a and b can range from 0 - 4; andn and m can range from about 5 to about 95 percent.The polymeric compositions prepared according to this method are suitable for use in electrophotography either alone as the primary photoresponsive entity or in combination with other photoconductive materials.Type: GrantFiled: July 16, 1975Date of Patent: February 8, 1977Assignee: Xerox CorporationInventors: Milan Stolka, Sam R. Turner
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Patent number: 4004073Abstract: Polymers and copolymers of ##STR1## are disclosed, wherein X and X.sup.1 are halogen.Type: GrantFiled: February 9, 1976Date of Patent: January 18, 1977Assignee: Hooker Chemicals & Plastics CorporationInventor: Victor A. Pattison
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Patent number: 3989873Abstract: This invention relates to a composition comprising a copolymer of ethylene and a halogenated comonomer selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene and mixtures thereof and 0 to 10 mol percent of an additional monomer selected from the group consisting of 3,3,3-trifluoro-2-trifluoromethyl propene, a vinyl monomer which is free of telogenic activity and which provides a side chain having at least two carbon atoms, said side chain being aromatic or having its elements bonded together by a single bond only, or mixtures thereof, and containing from about 1 to about 40% by weight of an oxide of cobalt, nickel, manganese, chromium, tin, molybdenum, tungsten or mixtures thereof. Such compositions are particularly useful as a primer coating for substrates such as metals in conjunction with an overlying layer of such copolymers.Type: GrantFiled: March 27, 1975Date of Patent: November 2, 1976Assignee: Allied Chemical CorporationInventors: Arthur B. Robertson, Robert J. Schaffhauser, Elmer C. Lupton, William A. Miller
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Patent number: 3965074Abstract: Disclosed herein are polyhalogenated isocyanates (intermediates for polyfluorinated vinyl isocyanates); polyfluorinated vinyl isocyanates, process therefor, and homopolymers and copolymers thereof; and use of said polyfluorinated vinyl isocyanate homopolymers and copolymers as water and oil repelling agents for cloth and paper.Type: GrantFiled: October 22, 1975Date of Patent: June 22, 1976Assignee: E. I. Du Pont de Nemours and CompanyInventor: William J. Middleton
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Patent number: 3953409Abstract: Conjugated diolefinic polymers having a molecular weight of less than 1,000,000 can be produced at high polymerization rates and in high yields by polymerizing a conjugated diolefin or copolymerizing a conjugated diolefin with a vinyl aromatic hydrocarbon in the presence of an alfin catalyst, in which as a molecular weight regulator is used a halogenated unsaturated hydrocarbon represented by the formula, ##EQU1## wherein R is an alkyl group having 1 to 7 carbon atoms, a vinyl group, a phenyl group, an alkyl-substituted phenyl group, a halogen atom or a hydrogen atom, and X, Y and Z which may be same or different are individually a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, at least one of the R, X, Y and Z being a halogen atom.Type: GrantFiled: May 21, 1970Date of Patent: April 27, 1976Assignee: Japan Synthetic Rubber Co., Ltd.Inventors: Koei Komatsu, Shigeyuki Nishiyama, Nobuyuki Sakabe, Akira Kogure
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Patent number: 3951913Abstract: A fluoroelastomer composition which contains (a) a fluoroelastomer, (b) at least one metal compound selected from the group consisting of bivalent metal oxide, bivalent metal hydroxide and mixture of bivalent metal oxide or metal hydroxide with metal salt of weak acid, (c) an aromatic polyhydroxy compound, (d) a quaternary ammonium compound of 8-alkyl- or 8-aralkyl-1,8-diaza-bicyclo[5.4.0]-7-undecenium, and (e) 1,8-diaza-bicyclo[5.4.0]-7-undecene in an amount of not more than 0.07 part by weight per 100 parts by weight of fluoroelaster, provides a fluoro-rubber having a low compression set and an excellent elastic property. The fluoroelastomer composition can be handled and processed with safety, and yet can be cured with an appropriate induction time and a good cure rate, and has excellent storage properties.Type: GrantFiled: April 19, 1974Date of Patent: April 20, 1976Assignee: Daikin Kogyo Co., Ltd.Inventors: Yutaka Kometani, Shun Koizumi, Takeshi Suzuki, Yasuyoshi Furukawa, Masayasu Tomoda, Kiyoichi Kondo