Four Or More Fluorine Atoms Patents (Class 524/546)
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Patent number: 4990544Abstract: Use of a composition comprising a polytetrafluoroethylene resin and a fine inorganic powder for a gasket, said composition being characterized in that the polytetrafluoroethylene resin is at least 5% by weight and the fine inorganic powder is at least 40% by weight, based on the total amount of the polytetrafluoroethylene resin and the fine inorganic powder; the total amount of the polytetrafluoroethylene resin and the fine inorganic powder is at least 80% by weight based on the entire amount of the composition; and the polytetrafluoroethylene resin and the fine inorganic powder are mutually uniformly dispersed and mixed with each other.Type: GrantFiled: May 1, 1989Date of Patent: February 5, 1991Assignee: Nichias CorporationInventors: Hiroshi Asaumi, Zenji Shimura, Takehiro Yoshida, Kenji Tadakuma, Shinzaburo Suzuki, Norio Takada, Kenichi Nakamura, Takene Hirai
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Patent number: 4975463Abstract: Novel antiviral ring-substituted ethyl or methyl 4-acetoxy (or propionyloxy)-2-naphthoates are provided.Type: GrantFiled: August 14, 1989Date of Patent: December 4, 1990Assignee: Temple University of the Commonwealth System of Higher EducationInventor: James L. Bloomer
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Patent number: 4957961Abstract: An improved fluoropolymer composition for insulating wires or jacketing cables comprising a blend of fluoropolymer and an additive selected from the class consisting of zinc borate, ZnCO.sub.3, ZnCrO4, ZnMoO.sub.4, Zn.sub.3 (PO.sub.4).sub.2, ZnSiO.sub.4, ZnSO.sub.4, ZnTiO.sub.3, ZnZrO.sub.4, zinc ammonium sulfate, zinc acetyl acetonate, zinc formate, zinc oxalate, BiBO.sub.3, alumina trihydrate, mixtures of molybdenum and tin oxides, molybdenum trioxide, antimony trioxide, and pyrogenic silica. A preferred additive is zinc borate. This composition provides for wire insulation and cable jackets which have improved flame and smoke resistance with federal safety and Underwriters Laboratories standards.Type: GrantFiled: March 30, 1989Date of Patent: September 18, 1990Assignee: Ausimont, U.S.A., Inc.Inventors: Swayambu Chandrasekaran, Nikhil K. Kundel, Brij Garg, Hong B. Chin
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Patent number: 4946889Abstract: A vinylidene fluoride-based polymer-containing coating composition provides coatings having weather resistance, chemical stability, surface lubricity, and enhanced adhesion to substrates. The composition comprises:(a) a vinylidene fluoride-based polymer;(b) an acrylic polymer containing hydrolyzable silyl groups and isocyanate groups; and(c) at least one organic solvent.Type: GrantFiled: June 7, 1989Date of Patent: August 7, 1990Assignee: Atochem North America, Inc.Inventor: Akinori Nishioka
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Patent number: 4933388Abstract: Solutions of copolymers of the tetrafluoroethylene/ethylene typeCopolymer solutions comprising tetrafluoroethylene, ethylene and, as appropriate, further .alpha.-olefinic monomers in low-molecular-weight polymers of chlorotrifluoroethylene are described. They can be used for coatings, impregnations, cast films and for the production of fibers and filaments by gel spinning.Type: GrantFiled: December 27, 1988Date of Patent: June 12, 1990Assignee: Hoechst AktiengesellschaftInventors: Peter Blickle, Friedhelm Gundert, Klaus Hintzer, Gernot Lohr, Werner Schwertfeger
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Patent number: 4925892Abstract: A fluoroelastomer composition that has enhanced adhesion to metal when cured which comprises:(a) an elastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer,(b) a vulcanization accelerator that is a quaternary phosphonium compound,(c) a crosslinking agent selected from the group consisting of a bisphenol or a polyhydroxy phenol of the formula: ##STR1## where R is H or an alkyl group or an aryl group and R' is an alkyl group or an aryl group, and(d) 0.02-0.8 weight percent based on the weight of the elastomeric copolymer of a metal adhesion promoter that is a tetraalkylammonium halide where each alkyl group contains 1-10 carbon atoms and the halide is a chloride, bromide or iodide. When cured in contact with metal the fluoroelastomer composition forms a strong bond with the metal surface.Type: GrantFiled: June 19, 1989Date of Patent: May 15, 1990Assignee: E. I. Du Pont de Nemours and CompanyInventors: David L. Tabb, Janet M. Wilson
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Patent number: 4914146Abstract: A tetrafluoroethylene base polymer-containing coating composition comprising a dispersion of a tetrafluoroethylene base polymer having a molecular weight of at least 5,000,000 in a liquid medium containing a surfactant, which is particularly useful for coating a fixing heater roller and a cooking utensil.Type: GrantFiled: July 3, 1989Date of Patent: April 3, 1990Assignee: Daikin Industries, Ltd.Inventors: Norimasa Honda, Mutsusuke Namba, Yoshiaki Kataoka
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Patent number: 4898779Abstract: Powders of tetrafluoroethylene copolymer having a non-spherical particle shape, a frictional packing ratio of 20 to 100% and an average particle size of 5 to 500 .mu.m. The powders are useful for powder coatings, particularly roto-moulding, roto-lining and electrostatic coating.Type: GrantFiled: December 21, 1987Date of Patent: February 6, 1990Assignee: Daikin Industries Ltd.Inventors: Tatsushiro Yoshimura, Nobuyuki Tomihashi, Shuhei Simasaki
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Patent number: 4894410Abstract: This invention provides fluorine-containing polymers having at least one thioorgano group. 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: March 9, 1988Date of Patent: January 16, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert E. Kolb, Paul F. Tuckner, Richard A. Guenthner
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Patent number: 4868234Abstract: A fluoroelastomer composition that has enhanced adhesion to metal when cured which comprises:(a) an elastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer,(b) a vulcanization accelerator that is a quaternary phosphonium compound,(c) a crosslinking agent selected from the group consisting of a bisphenol or a polyhydroxy phenol of the formula: ##STR1## where R is H or an alkyl group or an aryl group and R' is an alkyl group or an aryl group, and(d) 0.02-0.8 weight percent based on the weight of the elastomeric copolymer of a metal adhesion promoter that is a tetraalkylammonium halide where each alkyl group contains 1-10 carbon atoms and the halide is a chloride, bromide or iodide. When cured in contact with metal the fluoroelastomer composition forms a strong bond with the metal surface.Type: GrantFiled: April 27, 1988Date of Patent: September 19, 1989Assignee: E. I. Du Pont de Nemours and CompanyInventors: David L. Tabb, Janet M. Wilson
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Patent number: 4866118Abstract: The amine resistance of peroxide-cured fluorocarbon elastomers is improved by dispersing certain normally solid, inorganic chloride or bromide salts in the elastomer gum formulation.Type: GrantFiled: October 27, 1988Date of Patent: September 12, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventor: Mark S. Schaberg
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Patent number: 4839221Abstract: Use of a composition comprising a polytetrafluoroethylene resin and a fine inorganic powder for a gasket, said composition being characterized in that the polytetrafluoroethylene resin is at least 5% by weight and the fine inorganic powder is at least 40% by weight, based on the total amount of the polytetrafluoroethylene resin and the fine inorganic powder; the total amount of the polytetrafluoroethylene resin and the fine inorganic powder is at least 80% by weight based on the entire amount of the composition; and the polytetrafluoroethylene resin and the fine inorganic powder are mutually uniformly dispersed and mixed with each other.Type: GrantFiled: October 9, 1987Date of Patent: June 13, 1989Assignee: Nichias CorporationInventors: Hiroshi Asaumi, Zenji Shimura, Takehiro Yoshida, Kenji Tadakuma, Shinzaburo Suzuki, Norio Takada, Kenichi Nakamura, Takene Hirai
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Patent number: 4824898Abstract: A shaped article comprised of a tetrafluoroethylene polymer with a number average molecular weight of at least about 10.sup.6 which exhibits specific heat shrinking properties represented by an average maximum expansion ratio of from 2 to 10, a least maximum shrinkage ratio of 0.71 or less, an orientation release stress at 200.degree. C. of less than 5 Kg/cm.sup.2 and a shrinking starting temperature of at least 80.degree. C. The shaped article has excellent compression creep resistance, compression resistance, impact strength, dimensional stability, gas barrier property and tensile strength. Accordingly, it can be advantageously utilized as a sealant, a lining material, a bearing pad, a sliding pad, etc.Type: GrantFiled: March 24, 1988Date of Patent: April 25, 1989Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Masayuki Sukigara, Yasushi Kaneko, Hiroshi Kataoka
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Patent number: 4806584Abstract: A composition of matter is disclosed comprising (1) a saturated elastomer having an active halogen-containing cure site, (2) a soap/sulfur cure system, and (3) a phase transfer compound. The phase transfer catalyst comprises a quaternary ammonium or phosphonium salt of a mineral acid or an alkylene oxide polymer. The phase transfer compounds accelerate soap/sulfur cures and make it possible to obtain acceptable cure rates with higher fatty acid soaps.Type: GrantFiled: December 5, 1986Date of Patent: February 21, 1989Assignee: National Distillers and Chemical CorporationInventors: John M. Hoyt, Steven D. Blazey
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Patent number: 4804701Abstract: Composition on the basis of fluorinated polymers in aqueous dispersion, having a basic pH, containing alkoxysylanes and magnesium and/or aluminum as cations complexed with amino- or hydroxy-carboxy acids, acting as bonding agents, suitable to constitute a highly-adhesive layer, on metal surfaces, in particular as a primer.Type: GrantFiled: September 15, 1987Date of Patent: February 14, 1989Assignee: Ausimont S.p.A.Inventors: Alberto Fonte, Angelo Tentorio, Daria Lenti
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Patent number: 4803239Abstract: The amine resistance of peroxide-cured fluorocarbon elastomers is improved by dispersing certain normally solid, inorganic chloride or bromide salts in the elastomer gum formulation.Type: GrantFiled: September 14, 1987Date of Patent: February 7, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventor: Mark S. Schaberg
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Patent number: 4798854Abstract: Process for the production of a composite material based on a polymer matrix comprising homogeneously dispersed therein an organic and/or inorganic filler, said process consisting in mixing together the aqueous dispersions of the single components, in which the dispersed particles of the dispersion have a surface charge of the same sign and a "zeta potential" between 10 and 100mV (in absolute value) and wherein the ratio (in absolute value) between the "zeta potentials" of the particles of each dispersion is between 0.2 and 5.Type: GrantFiled: February 26, 1987Date of Patent: January 17, 1989Assignee: Ausimont S.p.A.Inventors: Mario Visca, Giancarlo Boero, Daria Lenti
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Patent number: 4786671Abstract: The present invention relates to new flameproofing agent combinations of bisphthalimides and tetrafluoroethylene polymers and their use for providing thermoplastic moulding compositions of halogenated polycarbonates and ABS polymers with a flame-repellent finish.Type: GrantFiled: January 23, 1986Date of Patent: November 22, 1988Assignee: Bayer AktiengesellschaftInventors: Hans-Jurgen Kress, Friedemann Muller, Horst Peters, Christian Lindner, Josef Beukers
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Patent number: 4767800Abstract: An exothermic composition comprises a particulate readily oxidizable metal such as aluminium, magnesium or silicon and an organic fluorine-containing compound, and usually an oxidizing agent for the readily oxidizable metal. The preferred organic fluorine-containing compound is polytetrafluoroethylene. The composition may also contain a binder, a particulate refractory material, refractory fibres and/or organic fibres. The composition may be used in the casting of molten metal, either in particulate form or as a preformed shape such as a sleeve or board, to cover or surround molten metal in the feeder of a casting mould or in the head or head box of an ingot mould.Type: GrantFiled: April 7, 1987Date of Patent: August 30, 1988Assignee: Foseco International LimitedInventors: Max G. Neu, Michael J. Gough
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Patent number: 4758618Abstract: A curable composition comprising an elastomeric vinylidene fluoride copolymer, a polyhydroxy compound and a vulcanization accelerator, characterized in that said copolymer contains from 2 to 50 mol % of vinylidene fluoride units and unsaturated bonds introduced by reacting an untreated elastomeric vinylidene fluoride copolymer dispersed in an aqueous medium, with an aqueous alkaline solution containing an onium compound.Type: GrantFiled: September 3, 1986Date of Patent: July 19, 1988
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Patent number: 4752635Abstract: A halogen-containing polyacrylate derivative having the formula: ##STR1## wherein A is a structural unit derived from a copolymerizable monomer having a double bond; R is ##STR2## wherein each of R.sub.1 and R.sub.2 is a hydrogen atom or a fluorinated methyl group, provided R.sub.1 and R.sub.2 are not hydrogen atoms at the same time, and R.sub.3 is a hydrogen atom or a lower alkyl group; X is a halogen atom or a methyl group; and m is a positive integer, n is 0 or a positive integer, and n/m is from 0 to 2, preferably from 0 to 1.Type: GrantFiled: December 24, 1986Date of Patent: June 21, 1988Assignee: Toyo Soda Manufacturing Co., Ltd.Inventors: Yoshitaka Tsutsumi, Toru Seita, Hideo Shuyama, Kousaburou Matsumura, Kyoko Nakazawa
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Patent number: 4748074Abstract: Non linear optical compositions contain a vinylidene fluoride copolymer and an additive having molecular optoelelectronic activity, e.g. methyl-N-(2,4-dinitrophenyl)-alaninate. Poled films derived from the composite display optoelectronic activity. There is a marked contrast with known techniques in which single crystals are utilized. The compositions are used to make laminates which display good waveguide properties.Type: GrantFiled: December 16, 1985Date of Patent: May 31, 1988Assignee: British Telecommunications Public Limited CompanyInventors: Philippos Pantelis, Graham J. Davies
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Patent number: 4746577Abstract: Non linear optical compositions contain a vinylidene fluoride copolymer and an additive having molecular optoelectronic activity, e.g. methyl-N-(2,4-dinitrophenyl)-alaninate. Poled films derived from the composite display optoelectronic activity. There is a marked contrast with known techniques in which single crystals are utilized. The compositions are used to make laminates which display good waveguide properties.Type: GrantFiled: February 24, 1987Date of Patent: May 24, 1988Assignee: British Telecommunications Public Limited CompanyInventors: Philippos Pantelis, Graham J. Davies
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Patent number: 4714748Abstract: Polytetrafluoroethylne fine powder is disclosed having an average molecular weight of at least 6,000,000, an amorphous index larger than 0.1 and a number average primary particle size of 0.1 to 0.8 micron, and further having a clear endothermic peak at a temperature of 347.degree..+-.3.degree. C. and another endothermic peak or shoulder at a temperature between 330.degree. C. and the temperature of said clear endothermic peak on a crystalline melting chart recorded by a differential scanning calorimeter. An unsintered article is made which is sintered and expanded at a temperature higher than the melting point of the polytetrafluoroethylene to give a porous article having improved properties.Type: GrantFiled: April 29, 1986Date of Patent: December 22, 1987Assignee: Daikin Kogyo Co., Ltd.Inventors: Jyuzaemon Hoashi, Syozo Fumoto, Kiyoshi Oshita
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Patent number: 4690968Abstract: A fluoroolefin copolymer having an inherent viscosity of from 0.05 to 2.0 dl/g and composed of(I) 10 to 70 mole % of monomeric units derived from a fluoroolefin represented by the general formula ##STR1## wherein X is H, Cl, F, CF.sub.3, OCF.sub.3 or OC.sub.3 F.sub.7, (II) 5 to 60 mole % of monomeric units derived from a vinyl carboxylate represented by the general formula ##STR2## wherein R.sub.1 represents an aliphatic, aromatic or alicyclic hydrocarbon group having 1 to 17 carbon atoms,(III) 5 to 70 mole % of monomeric units derived from a vinyl ether having an alkyl group with 1 to 8 carbon atoms, and(IV) 0 to 30 mole % of monomeric units derived from a hydroxyl-containing vinyl ether represented by the general formula ##STR3## wherein R.sub.2 represents an alkylene group having 1 to 6 carbon atoms.Type: GrantFiled: October 22, 1986Date of Patent: September 1, 1987Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Tomomasa Mitani, Ichiro Mihata
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Patent number: 4665113Abstract: The joint agglomeration of PTFE and metal-containing fillers belonging to the group comprising copper, tin and alloys thereof with one another and with other metals is improved if an alkylsulfate or an alkanesulfonate having 10 to 18 carbon atoms is added to the liquid agglomeration medium.Type: GrantFiled: April 10, 1986Date of Patent: May 12, 1987Assignee: Hoechst AktiengesellschaftInventor: Karl Eberl
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Patent number: 4657279Abstract: Anti-friction plate for use on a ski or ski binding. The anti-friction plate has a surface to be adhesively secured and means for shielding the surface of the plate from solar radiation.Type: GrantFiled: January 6, 1986Date of Patent: April 14, 1987Assignee: Salomon S.A.Inventors: Roger Pascal, Denis Girault
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Patent number: 4647602Abstract: This invention provides a method of dispersing a fluoroplastic in a polymer composition. The method comprises the steps of comminuting the fluoroplastic to a uniform dispersion, admixing with the fluoroplastic a finely divided solid adherent material that will coat at least a portion of said fluoroplastic to form a coated fluoroplastic and combining said coated fluoroplastic with a polymer using intensive mixing means.Type: GrantFiled: May 1, 1985Date of Patent: March 3, 1987Assignee: General Electric CompanyInventors: Boguslaw G. Wilczak, Edward V. Wilkus, Alexander F. Wu
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Patent number: 4640955Abstract: Tetrafluoroethylene fine powder resins are described which have surprisingly high extrusion pressures and molecular weights which make them useful in post-paste extruded stretching operations. The resins are made by using a permanganate polymerization initiator and controlling its rate of addition.Type: GrantFiled: October 29, 1985Date of Patent: February 3, 1987Assignee: E. I. Du Pont de Nemours and CompanyInventor: Satish C. Malhotra
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Patent number: 4636549Abstract: A tetrafluoroethylene copolymer composition in which the modifying comonomer is a fluorinated alkyl ethylene of the formulaCF.sub.3 (CF.sub.2).sub.3 CH.dbd.CH.sub.2,wherein the units of acid comonomers are located in the interior of the copolymer.Type: GrantFiled: May 31, 1985Date of Patent: January 13, 1987Assignee: E. I. Du Pont de Nemours and CompanyInventors: Subhash V. Gangal, Satish C. Malhotra
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Patent number: 4632949Abstract: The present invention relates to novel N-(alkoxyphenyl) phthalimides conforming to the structure ##STR1## wherein X is a halogen atom, R is a C.sub.1 -C.sub.4 alkyl, g is 1 to 5, n is an integer of from 0 to 4, m is either 0 or 1 and p is either 0 or 1. The phthalimide thus disclosed was found to be suitable as a flame retarding additive for thermoplastic molding compositions, especially compositions comprising polycarbonate resins.Type: GrantFiled: December 31, 1984Date of Patent: December 30, 1986Assignee: Mobay Chemical CorporationInventor: Sivaram Krishnan
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Patent number: 4629756Abstract: A radiant heat reflective composition comprising a blend of a tetrafluoroethylene copolymer and copper flake.Type: GrantFiled: November 4, 1985Date of Patent: December 16, 1986Assignee: E. I. Du Pont de Nemours and CompanyInventor: Dewey L. Kerbow
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Patent number: 4613636Abstract: A peroxide-curable fluoroelastomer composition which can be readily removed from a mold cavity without tearing which comprises a fluoroelastomer whose interpolymerized units consist essentially of units of tetrafluoroethylene, units of perfluoroalkyl perfluorovinyl ether, units of a bromine-containing olefin and, optionally, units of ethylene, and from about 0.05-2 parts per 100 parts fluoroelastomer of an N,N,N',N'-tetrasubstituted 1,8-diaminonaphthalene having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently alkyl groups of 1-6 carbon atoms, phenyl or benzyl, R.sub.1 and R.sub.2 and/or R.sub.3 and R.sub.4 can be joined to form a 5- or 6-membered heterocyclic ring in which a carbon atom can be replaced by an oxygen or a sulfur atom, R.sub.1 and R.sub.3 and/or R.sub.2 and R.sub.Type: GrantFiled: July 12, 1985Date of Patent: September 23, 1986Assignee: E. I. Du Pont de Nemours and CompanyInventor: Leo Ojakaar
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Patent number: 4594399Abstract: Perhalogenated dioxoles, halogenated dioxolanes, a process for making the dioxoles and dioxolanes, and polymers of dioxole and dioxolane monomers.Type: GrantFiled: March 12, 1985Date of Patent: June 10, 1986Assignee: E. I. Du Pont de Nemours and CompanyInventors: Burton C. Anderson, David C. England, Paul R. Resnick
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Patent number: 4580790Abstract: A composition of matter adapted for use as a sealing material and in fabricating bushings, rider rings and structural support pads. The composition is sintered polytetrafluoroethylene (PTFE) having uniformly dispersed therein from 5 to 50 volume percent of filler particles selected from the group consisting of glass particles and mineral particles having a Rockwell C hardness of between 10 C to 50 C wherein the filler particles are present in the polytetrafluoroethylene when the sintering occurs. Lead glass, soda-lead glass and soda-lime glass are among the filler particles which are incorporated into the PTFE to form structurally strong compositions which generate low amounts of wear debris.Type: GrantFiled: June 21, 1984Date of Patent: April 8, 1986Assignee: Hughes Aircraft CompanyInventor: Paul R. Doose
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Patent number: 4578409Abstract: The present invention relates to a novel halogenated silane conforming to the structure ##STR1## where X is a halogen atom, n is an integer of from 1 to 4, p is an integer of from 1 to 9 and m is an integer of from 1 to 5. The silane thus disclosed was found to be particularly suitable as a flame retarding additive for thermoplastic molding compositions.Type: GrantFiled: January 14, 1985Date of Patent: March 25, 1986Assignee: Mobay Chemical CorporationInventors: Sivaram Krishnan, Ulrich R. Grigo, Donald A. Folajtar
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Patent number: 4568716Abstract: There is disclosed according to the invention a composition and an article made from the composition. In a preferred embodiment, the composition consists essentially of about 50-99 weight percent of a fluoroelastomer copolymer of tetrafluoroethylene and propylene having the following structure: ##STR1## where x=y, about 0-50 weight percent of a polymer filler, about 1-25 weight percent of dimethyl methyl phosphonate and about 0-15 weight percent of trioctyl phosphate.Type: GrantFiled: December 17, 1984Date of Patent: February 4, 1986Assignee: Raychem CorporationInventor: Tibor T. Derencsenyi
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Patent number: 4550132Abstract: A peroxide-curable fluoroelastomer composition comprising an elastomeric copolymer containing units derived from vinylidene fluoride, units derived from at least one other fluorine-containing monomer copolymerizable with vinylidene fluoride, said monomer being a compound which contains 2-7 carbon atoms, contains no bromine atom and contains at least as many fluorine atoms as carbon atoms, up to 3 mole percent, based on the total moles of copolymer, of a bromine-containing olefin with the proviso that enough of such olefin is present to provide at least about 0.05 weight percent bromine in the copolymer and about 0.5-5 parts per hundred parts elastomeric copolymer of tetramethylene sulfone.Type: GrantFiled: March 19, 1984Date of Patent: October 29, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Dante R. Capriotti
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Patent number: 4548960Abstract: A composition suitable for pipe jointing compounds is provided, which composition contains synthetic fibres, such as PTFE, FEP, polyethylene or polypropylene in admixture with a suitable carrier.Type: GrantFiled: November 23, 1983Date of Patent: October 22, 1985Assignee: UNASCO Pty. LimitedInventor: Herbert W. Bentley
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Patent number: 4546144Abstract: It has been discovered that if a selected water-soluble aluminum, magnesium or zinc salt of a monovalent anion is added to an aqueous dispersion of a non-melt-fabricable tetrafluoroethylene polymer wherein the dispersion has a pH of 4 or less, the resulting dispersion will flow well on a woven fabric substrate, such as a woven glass fiber fabric, and will fill and cover the interstices of the weave without the necessity of having filler particles present.Type: GrantFiled: January 9, 1984Date of Patent: October 8, 1985Assignee: E. I. Du Pont De Nemours and CompanyInventor: Alan C. Knight
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Patent number: 4541735Abstract: A thermal sensing element containing a heat responsive material having a very high negative coefficient of thermal expansion. The heat responsive material contained therein is a methanol saturated copolymer of hexafluoropropylene and vinylidene fluoride. This thermal sensing element can detect minute temperature changes and can be packaged in a compact container for use in applications where space is limited.Type: GrantFiled: December 24, 1984Date of Patent: September 17, 1985Assignee: General Motors CorporationInventor: Ismat A. Abu-Isa
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Patent number: 4530881Abstract: A wet friction material composition for use in clutches, brakes and the like is composed of a resilient binder comprising a fluoroelastomer. The friction material is characterized by containing a significant amount of wollastonite as a filler, which unexpectedly alters the ratio between the dynamic and static coefficients of friction exhibited by the friction material during actual use.Type: GrantFiled: February 24, 1983Date of Patent: July 23, 1985Assignee: Raymark Industries, Inc.Inventors: Muljadi Santoso, John N. Anderson
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Patent number: 4529759Abstract: A peroxide-curable fluoroelastomer composition which comprises a fluoroelastomer whose interpolymerized units consist essentially of units derived from vinylidene fluoride, units derived from at least one other fluorine-containing monomer copolymerizable therewith, said monomer being a compound which contains 2-7 carbon atoms, contains no bromine atoms or iodine atoms, and contains at least as many fluorine atoms as carbon atoms, and said fluoroelastomer contains up to 3 mole percent of units derived from a bromine-containing olefin or 0.1-2 mole percent of units derived from an iodine-containing olefin, and from about 0.05-2 parts per 100 parts fluoroelastomer of an N,N,N',N'-tetrasubstituted 1,8-diaminonaphthalene having the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently alkyl groups of 1-6 carbon atoms, phenyl or benzyl, R.sub.1 and R.sub.2 and/or R.sub.3 and R.sub.Type: GrantFiled: December 7, 1984Date of Patent: July 16, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Leo Ojakaar
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Patent number: 4524197Abstract: Making a fluoroelastomer by feeding to an aqueous polymerization medium in a reactor about 25-75% by weight of the total monomers, vinylidene fluoride, at least one other fluorine-containing ethylenically unsaturated monomer containing at least as many fluorine atoms as carbon atoms and copolymerizable with vinylidene fluoride, an inorganic free-radical initiator, a chain transfer agent added in an amount sufficient to maintain a concentration in the aqueous polymerization medium of from about 0.5.times.10.sup.-3 to 5.times.10.sup.-3 moles per 100 grams of total monomers, and from about 0.02-2% by weight, based on the weight of the aqueous medium, of a surfactant which is a compound having the formula:F--CF.sub.2 CF.sub.2).sub.n CH.sub.2 CH.sub.2 --OSO.sub.3 Mwhere n is an integer of from 2-8 or mixtures thereof and M is an alkali metal cation, hydrogen or ammonium, maintaining the pH of the aqueous polymerization medium within a range of from about 2.Type: GrantFiled: August 28, 1984Date of Patent: June 18, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Ausat A. Khan
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Patent number: 4517378Abstract: A curing agent for fluorocarbon polymer coating compositions selected from the following group: ##STR1## where R is R.sup.1 NH, R.sup.1 is an aliphatic or cycloaliphatic hydrocarbon radical, R.sup.2 is C or an aliphatic hydrocarbon group, R.sup.3 is H or CH.sub.3, where x is 3 when R.sup.2 is a hydrocarbon group and x is 4 when R.sup.2 is C; the curing agents form ambient curing fluorocarbon polymer coating compositions;These compositions are used to provide corrosion and abrasion resistant coatings for large structures in chemical plants, oil refineries, oil drilling platforms, and the interior of smoke stacks of large utility companies.Type: GrantFiled: June 30, 1983Date of Patent: May 14, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Joseph A. Vasta
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Patent number: 4517319Abstract: The invention relates to mixtures essentially composed of a polyoxymethylene, a polyurethane and a filler, the polyurethane having a Shore hardness A of not more than 90 and the filler having an average particle size less than 10 .mu.m.The shaped articles produced from the mixture according to the invention are distinguished, above all, by improved notched impact strength.Type: GrantFiled: February 2, 1984Date of Patent: May 14, 1985Assignee: Hoechst AktiengesellschaftInventors: Eckart Reske, Ernst Wolters
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Patent number: 4506054Abstract: A coating composition of a fluorocarbon polymer which cures at ambient temperatures in which a fluorocarbon polymer in solution is of vinylidene fluoride and hexafluoropropylene and has a weight average molecular weight of about 5,000-600,000; the composition also containsdispersed fluorocarbon polymer particles of the following group polytetrafluoroethylene, fluorinated ethylene/propylene polymer, polyvinyl fluoride, polyvinylidene fluoride, copolymer of tetrafluoroethylene/perflouroalkoxyvinyl ether;a metallic oxide such as magnesium oxide which is an acid acceptor; andan aliphatic or cycloaliphatic polyamine curing agent;preferably, the composition contains a reinforcing pigment such as titanium dioxide.The coating composition is used to provide corrosion and abrasion resistant coatings for large structures in chemical plants, oil refineries, oil drilling platforms, and as a coating for the interior of smoke stacks of large utility companies.Type: GrantFiled: March 21, 1984Date of Patent: March 19, 1985Inventor: Joseph A. Vasta
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Patent number: 4503099Abstract: A variety of coating resin latices may be deposited on metallic surfaces in the form of thin, pin hole-free polymer films from an alkaline latex comprising the coating latex, a cyanide salt and a water-soluble oxidizing agent. The coated substrates are resistant to fouling and to deposition of scale deposits when employed as heat transfer surfaces in cooling systems.Type: GrantFiled: June 15, 1983Date of Patent: March 5, 1985Assignee: Borg-Warner CorporationInventors: Franklin S. Chang, James A. Towers
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Patent number: 4496682Abstract: A curable fluoropolymer composition containing a polyhydroxy aromatic compound press-cure crosslinking agent, and a postcure crosslinking agent selected from aromatic diamines, and bisamines having the formula ##STR1## where A is a divalent radical and x is zero or 1, and the process of curing such a composition by partially curing in a confining zone, and then postcuring.Type: GrantFiled: February 29, 1984Date of Patent: January 29, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Walter W. Schmiegel
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Patent number: 4495247Abstract: A primer composition for fluorocarbon polymer coatings which cures at ambient temperatures and contains a fluorocarbon polymer of vinylidene fluoride and hexafluoropropylene and has a weight average molecular weight of about 50,000-300,000;a metallic oxide such as magnesium oxide which is an acid acceptor andan amino alkyl alkoxy silane; preferably, the primer contains a reinforcing pigment such as titanium dioxide;The primer is used in combination with fluorocarbon polymer coatings to provide corrosion and abrasion resistant coatings for equipment used in chemical plants, oil refineries, oil drilling platforms, and for the interior of smoke stacks of large utility companies.Type: GrantFiled: June 30, 1983Date of Patent: January 22, 1985Assignee: E. I. Du Pont de Nemours and CompanyInventor: Joseph A. Vasta