Four Or More Fluorine Atoms Patents (Class 524/546)
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Patent number: 7015275Abstract: An aqueous water- and oil-repellent dispersion containing: (A) a homopolymer or copolymer containing at least one polymerizable compound having a perfluoroalkyl or perfluoroalkenyl group and an acrylate or methacrylate group, or a copolymer containing said polymerizable compound and another compound copolymerizable therewith, (B) a surfactant comprising a cationic surfactant and a nonionic surfactant comprising an alkylene oxide adduct of a higher aliphatic secondary alcohol, and (C) a high flash-point organic solvent, has durable water- and oil-repellency and excellent storage stability.Type: GrantFiled: April 4, 2000Date of Patent: March 21, 2006Assignee: Daikin Industries, Ltd.Inventors: Tsukasa Aga, Masahiro Miyahara, Masaki Fukumori, Ryosuke Hara
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Patent number: 7006780Abstract: An apparatus for reducing accumulation of toner from the surface of an electrode member in a development unit of an electrostatographic printing apparatus by providing a coating having a polymer with a partly fluorinated polymer on at least a portion of the electrode member.Type: GrantFiled: November 25, 2003Date of Patent: February 28, 2006Assignee: Xerox CorporationInventors: David J. Gervasi, Santokh S. Badesha, John W. Spiewak
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Patent number: 6911489Abstract: PTFE pellets with good bulk density, homogeneity, and flowability properties may be obtained by: (1) wetting a PTFE powder with a solvent, to obtain a wetted PTFE powder; (2) forming the wetted PTFE powder into agglomerated pellets of PTFE; and (3) drying the agglomerated pellets of PTFE pellets, in which the drying of the agglomerated pellets of PTFE is carried out in a fluidized bed drier. The PTFE pellets so obtained may be used to prepare molded articles of PTFE.Type: GrantFiled: June 10, 2002Date of Patent: June 28, 2005Assignee: Asahi Glass Fluoropolymers USA, Inc.Inventors: Pamela J. Baron, Gary Eckrote, Tonya James, Ronald Partridge, Timothy C. Duzick
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Patent number: 6884827Abstract: A seal ring seals operating oil hermetically and is attached to an annular seal ring groove provided on an outer circumference of a shaft member. The seal ring comprises fluororesin, metal powder having a hardness equal to or more than that of any of a side surface of the seal ring groove serving as a sliding partner and an inner circumferential surface of a housing engaged relatively rotatable with the outer circumference of the shaft member, and modified fluororesin formed by irradiating an ionizing radiation in a range from 1 kGy to 10 MGy inclusive in a state of being heated up to a melting point thereof or higher under an inert gas atmosphere with an oxygen partial pressure of 1.33 kPa or less.Type: GrantFiled: April 1, 2003Date of Patent: April 26, 2005Assignees: Nissan Motor Co., Ltd., Hitachi Cable Ltd.Inventors: Tomohito Ota, Tomihito Hashimoto, Yasuaki Yamamoto, Hiroo Kusano
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Patent number: 6852416Abstract: There are disclosed new composite materials having improved electric field induced strain levels, improved electric constants, and having advantageous mechanical properties for use in electrical devices.Type: GrantFiled: April 12, 2002Date of Patent: February 8, 2005Assignee: The Penn State Research FoundationInventors: Qiming Zhang, Zhongyang Cheng, Haisheng Xu
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Patent number: 6841594Abstract: A dispersion of non-melt-processible fluoropolymer particles having an SSG of less than about 2.225 in aqueous medium. The fluoropolymer particles comprise a core of high molecular weight polytetrafluoroethylene having an average melt creep viscosity greater than about 1.5×1010 Pa·s and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. The shell has an average melt creep viscosity greater than about 9×109 Pa·s and comprises about 5 to about 30% by weight of the particles. The fluoropolymer in the dispersion of the invention is fibrillating.Type: GrantFiled: March 13, 2002Date of Patent: January 11, 2005Assignee: E. I. du Pont de Nemours and CompanyInventors: Clay Woodward Jones, Walter Thomas Krakowiak
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Patent number: 6833403Abstract: Fluorine-containing emulsifiers can be removed from fluoropolymer dispersions by adding to the dispersion a nonionic emulsifier, removing the fluorine-containing emulsifier by contact with an anion exchanger and separating the dispersion from the anion exchanger. The resulting dispersions can be concentrated and used for coating applications.Type: GrantFiled: August 3, 2001Date of Patent: December 21, 2004Assignee: 3M Innovative Properties CompanyInventors: Hermann Blädel, Klaus Hintzer, Gernot Löhr, Werner Schwertfeger, Reinhard Albert Sulzbach
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Patent number: 6825265Abstract: Pigments and compositions for use in laser marking. A colorless UV-absorbing pigment at least partially coated with a synergist has the formula [Rm(SiOn)]pR′q, wherein (a) m is 1 to 3, n is 1 to 3, p is at least 1, and q is 0 to 3, and (b) at least one R or R′ is a substituent that upon pyrolysis generates a black material suitable for providing a mark. Such pigments are useful in fluoropolymers used for wire and cable insulation.Type: GrantFiled: November 21, 2001Date of Patent: November 30, 2004Assignee: Tyco Electronics CorporationInventors: Vijay Daga, Klaus J. Dahl
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Patent number: 6825250Abstract: The present invention provides a process of reducing the amount of fluorinated emulsifier in an aqueous fluoropolymer dispersion by contacting the aqueous fluoropolymer dispersion with an anion exchange resin in a non-fixed resin bed, the process comprising: (a) mixing the aqueous fluoropolymer dispersion with an effective amount of a surfactant so as to stabilize the fluoropolymer dispersion while being contacted with the anion exchange resin; (b) contacting the aqueous fluoropolyrner dispersion with an anion exchange resin by agitating the aqueous fluoropolymer dispersion with an effective amount of anion exchange resin for a time of less than 4 hours to reduce the amount of fluorinated emulsifier in the aqueous fluoropolymer dispersion to a desired level; and (c) separating the anion exchange resin from the aqueous fluoropolymer dispersion.Type: GrantFiled: May 5, 2003Date of Patent: November 30, 2004Assignee: 3M Innovative Properties CompanyInventors: Rebekka Epsch, Klaus Hintzer, Gernot Löhr, Werner Schwertfeger
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Patent number: 6806306Abstract: A fluorine containing thermoplastic vulcanizate composition includes a continuous phase of at least one melt formable thermoplastic resin and a discrete phase of a vulcanized perfluoroether elastomer. The perfluoroether elastomer comprises between 10 and 80 weight percent based on the total amount of the continuous phase and the disperse phase combined.Type: GrantFiled: May 22, 2002Date of Patent: October 19, 2004Assignee: Freduenberg-NOK General PartnershipInventors: Craig A. Chmielewski, Paul J. Hochgesang
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Patent number: 6794550Abstract: The invention provides a process for removing steam-volatile fluorinated emulsifiers in their free acid form, from aqueous fluoropolymer dispersions. The process comprises adding a nonionic emulsifier, to the aqueous fluoropolymer dispersion and, at a pH-value of the aqueous fluoropolymer dispersion below 5, removing steam-volatile fluorinated emulsifier by distillation until the concentration of steam-volatile fluorinated emulsifier in the dispersion reaches the desired value.Type: GrantFiled: August 28, 2001Date of Patent: September 21, 2004Assignee: 3M Innovative Properties CompanyInventors: Klaus Hintzer, Gernot Löhr, Albert Killich, Werner Schwertfeger
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Conductive polymeric composite material with a resistance which is self-regulated by the temperature
Patent number: 6790530Abstract: The present invention relates to a composite material comprising, by weight, the total being 100% : A) 40 to 90% of PVDF homopolymer or copolymer crystallized essentially in the &bgr; form, B) 10 to 60% of a conductive filler, C) 0 to 40% of a crystalline or semi-crystalline polymer, D) 0 to 40% of a filler other than C, such that the crystals in the &bgr; form are nucleated on the surface of the particles of the conductive filler. This material is conductive with a resistance which is self-regulated by the temperature. It shows an increase in the resistance as a function of the temperature (PTC or “Positive Temperature Coefficient” effect), so that the intensity stabilizes at an equilibrium temperature.Type: GrantFiled: June 30, 2003Date of Patent: September 14, 2004Assignee: ATOFINAInventors: Alexander Korzhenko, Emmanuel Rastelletti, R. G. Sharpe-Hill -
Patent number: 6784239Abstract: A durable water repellent agent comprising a repellent and a fluorine-containing resin, wherein the repellent comprises at least one member selected from the group consisting of a perfluoroalkyl group-containing substance (I), a fluorine-containing surfactant (II), a fluorine-containing oil (III), a fluorosilicone oil (IV) and a silicone oil (V), the solid content weight ratio between said repellent and said fluorine-containing resin being (repellent):(fluorine-containing resin)=50:50 to 99:1.Type: GrantFiled: March 15, 2002Date of Patent: August 31, 2004Assignee: Daikin Industries, Ltd.Inventors: Susumu Wada, Kayoko Honda, Keiko Kunimasa, Katsuhiko Imoto
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Publication number: 20040162384Abstract: An aqueous ionomer gel having a high viscosity, particularly a proton conducting ionomer, as well as to related products incorporating such gels. Such aqueous ionomer gels are suitable for suspending catalysts for formation of catalyst inks, which in turn are suitable for screen printing on a variety of surfaces. Representative surfaces are the electrode or membrane surfaces in an electrochemical fuel cell. Methods for making aqueous ionomer gels are also disclosed.Type: ApplicationFiled: November 12, 2003Publication date: August 19, 2004Applicant: Ballard Power Systems Inc.Inventors: Wesley Gervais, Michael V. Lauritzen, Kristi M. Zychowka, Lawrence A. Vanderark, Kevin Michael Colbow
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Patent number: 6774164Abstract: A novel emulsion polymerization process for the production of fluoroelastomers is disclosed wherein a partially fluorinated anionic surfactant of the formula F—(CF2CF2)n—CH2CH2SO3M, where n is an integer from 2 to 9, or mixtures thereof, and M is a cation having a valence of 1, is used as the dispersing agent.Type: GrantFiled: August 24, 2001Date of Patent: August 10, 2004Assignee: DuPont Dow Elastomers L.L.C.Inventors: Donald Frederick Lyons, Albert Lloyd Moore, Phan Linh Tang
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Patent number: 6774169Abstract: To provide a granular PTFE powder having a low electrostatic charging property even after drying. A process for preparing a low-electrostatically-charging granular polytetrafluoroethylene powder by contacting a polar group-containing organic compound having an electrostatic charging-preventing ability when substantially dry to a granular polytetrafluoroethylene powder and then drying the granular powder while the polar group-containing organic compound is kept remaining in the granular powder.Type: GrantFiled: March 8, 2000Date of Patent: August 10, 2004Assignee: Daikin Industries, Ltd.Inventors: Michio Asano, Kenji Futatsugi, Masayuki Tsuji
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Patent number: 6774176Abstract: The invention discloses a process for the preparation of fluorinated polymers by miniemulsion polymerization of a mixture of fluorinated and nonfluorinated monomers in the absence of organic solvent. This polymerization process makes it possible to obtain an aqueous emulsion of fluorinated polymers devoid of coagulum.Type: GrantFiled: August 14, 2001Date of Patent: August 10, 2004Assignee: E. I. du Pont de Nemours and CompanyInventors: Dennis Tembou Nzudie, Didier Juhue, Jean-Marc Corpart
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Patent number: 6767942Abstract: An organometallic coating composition having an organometallic compound, a fully fluorinated co-solubilizer, and a fluorinated solvent, and the organometallic compound is miscible in the coating composition, and the co-solubilizer is present in the coating composition.Type: GrantFiled: July 18, 2002Date of Patent: July 27, 2004Assignee: Xerox CorporationInventors: David J. Gervasi, Santokh S. Badesha, George J. Bingham
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Patent number: 6753371Abstract: A fluorine rubber composition used for the surface layer material of a fixing member to fix a toner transferred onto a recording material comprises fluorine rubber having a polymerization degree based on vinylidene fluoride. The fixing member includes a base material, and a surface layer material disposed on the surface of the base material, and the surface layer material contains fluorine rubber having a polymerization degree base on vinylidene fluoride. Preferably, the fluorine rubber composition contains a reinforcing agent, antacid, vulcanizing agent, vulcanization accelerator, spherical filler, and solvent. Preferably, the fixing member has numerous fine convex portions on its surface. Accordingly, the amount of the toner adhering to the surface of the fixing member is reduced. Thus, generation of offset trouble can be reliably prevented for a long period of time. As a result, the durability of the fixing member will be improved.Type: GrantFiled: May 24, 2001Date of Patent: June 22, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshihiro Kiyomura, Hirofumi Kama, Hiroyuki Noda
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Patent number: 6750296Abstract: The present invention provides block copolymers with semifluorinated LC side groups (single or monodendron groups). The block copolymers can be blended with a thermoplastic elastomer block copolymer, e.g., styrene-ethylene/butylene-styrene (SEBS) to provide a surface active block copolymer (SABC).Type: GrantFiled: January 7, 2002Date of Patent: June 15, 2004Assignee: Cornell Research Foundation, Inc.Inventors: Christopher K. Ober, Maoliang Xiang, Kenneth J. Wynne
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Patent number: 6747089Abstract: A process for solubilizing an organometallic compound in a fluorinated solvent to form an organometallic solution by adding and reacting a co-solubilizer having a fully fluorinated polymer, an organometallic compound, and a fluorinated solvent, and the co-solubilizer has the ability to cause the organometallic compound to become miscible in a fluorinated solvent, and further, the co-solubilizer is not a catalyst and is present in the final organometallic solution.Type: GrantFiled: July 18, 2002Date of Patent: June 8, 2004Assignee: Xerox CorporationInventors: David J. Gervasi, Santokh S. Badesha, George J. Bingham
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Patent number: 6743842Abstract: To provide a powder coating composition which comprises 100 parts by weight of fluorine-containing resin and 1 to 40 parts by weight of tetrafunctional or trifunctional silicate compound or a condensation product thereof, has a function of removing electrostatic charge and gives a coating film having a high hardness and stain-proof property.Type: GrantFiled: June 14, 2001Date of Patent: June 1, 2004Assignee: Daikin Industries, Ltd.Inventors: Ryoichi Fukagawa, Nobuhiko Tsuda, Masaru Nagato, Go Nagai, Ryuji Iwakiri
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Patent number: 6740775Abstract: A crystalline form of the sodium salt of pravastatin, which is known by the chemical name 1-naphthaleneheptanoic acid, 1,2,6,7,8,8a-hexahydro-&bgr;, &dgr;,6-trihydroxy-2-methyl-8-(2-methyl-1-oxobutoxy)-, mono sodium salt, which is useful as a pharmaceutical substance. A method for its preparation and isolation, a pharmaceutical formulation containing the sodium salt of pravastatin in the crystalline form and a pharmaceutically acceptable carrier, and the pharmaceutical method of treatment are also disclosed.Type: GrantFiled: April 4, 2003Date of Patent: May 25, 2004Assignee: LEK Pharmaceuticals d.d.Inventor: Zlatko Pflaum
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Patent number: 6683126Abstract: The present invention provides a coating composition for producing difficult-to-wet surfaces, comprising i) at least one finely divided powder whose particles have a hydrophobic surface and a porous structure characterized by a BET surface area (determined in accordance with DIN 66131) of at least 1 m2/g, and ii) at least one film-forming binder characterized by a surface tension <50 mN/m, the weight ratio of powder to binder being at least 1:4. It also provides a process for producing difficult-to-wet surfaces, and provides for the use of the coating compositions for producing surfaces having a self-cleaning effect and for reducing the flow resistance for liquids in pipes.Type: GrantFiled: April 25, 2001Date of Patent: January 27, 2004Assignee: BASF AktiengesellschaftInventors: Harald Keller, Ingolf Kühn, Ekkehard Jahns, Christian Lach, Stephan Hüffer, Thilo Krebs, Yi Thomann, Thomas Frechen
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Patent number: 6683127Abstract: A carbon black filler for crosslinkable elastomer composition having a content of impurity metals of not more than 300 ppm and a pH value of 5.0 to 11.0. The filler can be obtained by subjecting a starting carbon black filler to extraction treatment with an acid to reduce a content of impurity metals of the filler and then alkali treatment with an alkali to neutralize a remaining acid. The filler does not cause a crosslinking failure even when added to an elastomer composition and can provide an elastomer molded article suitable as a very clean sealing material for semi-conductor production apparatuses.Type: GrantFiled: January 16, 2001Date of Patent: January 27, 2004Assignee: Daikin Industries, Ltd.Inventors: Hiroyuki Tanaka, Masanori Hasegawa, Tsuyoshi Noguchi
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Patent number: 6680357Abstract: Acrylic Modified Fluoropolymers based on vinylidene fluoride polymers are disclosed wherein the acrylic phase is capable of entering into crosslinking reactions. The final cured products provide superior solvent extractability resistance to the fluoropolymer phase.Type: GrantFiled: July 10, 2000Date of Patent: January 20, 2004Assignee: ATOFINA Chemicals, Inc.Inventors: Lotfi Hedhli, Larry Wempe
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Patent number: 6679979Abstract: An aqueous ionomer gel having a high viscosity, particularly a proton conducting ionomer, as well as to related products incorporating such gels. Such aqueous ionomer gels are suitable for suspending catalysts for formation of catalyst inks, which in turn are suitable for screen printing on a variety of surfaces. Representative surfaces are the electrode or membrane surfaces in an electrochemical fuel cell. Methods for making aqueous ionomer gels are also disclosed.Type: GrantFiled: December 12, 2001Date of Patent: January 20, 2004Assignee: Ballard Power Systems Inc.Inventors: Wesley Gervais, Michael V. Lauritzen, Kristi M. Zychowka, Lawrence A. Vanderark, Kevin Michael Colbow
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Publication number: 20030229167Abstract: PTFE pellets with good bulk density, homogeneity, and flowability properties may be obtained by:Type: ApplicationFiled: June 10, 2002Publication date: December 11, 2003Applicant: Asahi Glass Fluoropolymers USA, INC.Inventors: Pamela J. Baron, Gary Eckrote, Tonya James, Ronald Partridge, Timothy C. Duzick
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Patent number: 6653393Abstract: To provide a paintwork coating composition that is harmless to the environments and humans and enables a paintwork to be fully coated by the application of only a small quantity of coating composition and also provide a coating cloth that provides a smooth rubbing work in the coating process and can develop a good water-repellent property and a good antifouling property, water dispersion comprising polytetrafluoroethylene and perfluoropolyether is prepared as the coating composition, and also the coating composition is impregnated in a cloth having a basis weight of (unit representing mass per unit area of fabric, a gram number per square meter) 30-300 g/m2 and a density of 0.02-0.3 g/cm3 under load condition of 1.961 KPa.Type: GrantFiled: April 19, 2001Date of Patent: November 25, 2003Assignee: Soft99 CorporationInventors: Makoto Ishii, Junichi Nonaka, Ryutaro Hidaka
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Patent number: 6649217Abstract: A method for manufacturing parts from an antiadhesive organic powder includes the step of plasma-treating the antiadhesive organic powder and processing the antiadhesive organic powder for forming the parts. The device for performing the method has a housing with a receiving chamber that has at least one inlet for introducing a process gas. A rotary drum is rotatably mounted in the receiving chamber for supporting the antiadhesive organic powder. At least one electrode is mounted in the receiving chamber and at least one energy source is connected to the electrode for energizing the electrode. The process gas can be exposed to high frequency radiation or microwave radiation in order to produce a plasma.Type: GrantFiled: October 13, 1999Date of Patent: November 18, 2003Assignee: KACO GmbH & Co.Inventor: Herbert Gust
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Publication number: 20030171444Abstract: Semicrystalline sulphonic fluorinated ionomers having an equivalent weight higher than 700 g/eq, up to 1,700, comprising:Type: ApplicationFiled: December 20, 2002Publication date: September 11, 2003Inventors: Vincenzo Arcella, Alessandro Ghielmi, Giulio Tommasi
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Patent number: 6617515Abstract: A coating material based on polytetrafluoroethylene (PTFE) containing pigments and suitable for marking with a UV laser includes raw PTFE, 0.01 to 5 wt. % titanium oxide pigment, and 0.1 to 5 wt. % of one or more of arylene sulfide polymers, particularly polyphenylene sulfide (PPS); polyarylsulfones, in particular polysulfone (PSU) or polyethersulfone (PES); and polyaryletherketones, in particular polyetherketone (PEK) or polyetheretherketone (PEEK).Type: GrantFiled: March 20, 1996Date of Patent: September 9, 2003Assignee: Compagnie Plastic OmniumInventor: Chor Keung Yeung
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Patent number: 6608129Abstract: Composites which include a polymer matrix having natural free volume therein and an inorganic or organic material disposed in the natural free volume of the polymer matrix are disclosed. In addition, methods for making a composite are described. A polymer matrix having free volume therein is provided. The free volume is evacuated, and inorganic or organic molecules are infused into the evacuated free volume of the polymer matrix. The inorganic or organic molecules can then be polymerized under conditions effective to cause the polymerized inorganic or organic molecules to assemble into macromolecular networks. Alternatively, where the polymer matrix contains a functionality, the inorganic or organic molecules can be treated under conditions effective to cause the inorganic or organic molecules to interact with the polymer matrix's functionality.Type: GrantFiled: March 22, 2000Date of Patent: August 19, 2003Assignee: Integument Technologies, Inc.Inventors: Timothy S. Koloski, Terrence G. Vargo
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Patent number: 6602961Abstract: A fluorine-containing elastomer composition comprising a terpolymer of tetrafluoroethylene, perfluoro(lower alkyl vinyl ether) and perfluoro(&ohgr;-cyanoalkyl vinyl ether) and a bisaminophenyl compound represented by the following general formula as a curing agent: wherein A is an alkylidene group having 1 to 6 carbon atoms, a perfluoroalkylidene group having 1 to 10 carbon atoms, a SO2 group, an O group, a CO group, or a carbon-carbon bond capable of directly coupling two benzene rings; and X and Y each are a hydroxyl group or an amino group can give a rubbery vulcanization product with a good processability and good physical properties by a commercially available cross-linking agent free from any safety problem.Type: GrantFiled: July 11, 1995Date of Patent: August 5, 2003Inventors: Satoru Saito, Haruyoshi Tatsu, Hiroaki Murata
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Publication number: 20030139521Abstract: A fluorochemical composition for rendering a fibrous substrate oil and/or water repellent which comprises a solution or dispersion of a fluoropolymer having a partially or fully fluorinated backbone and comprising one or more repeating units corresponding to the general formula: 1Type: ApplicationFiled: May 21, 2001Publication date: July 24, 2003Inventors: Jeffrey G. Linert, E. Steven McAlister, Lian S. Tan, Richard S. Buckanin, Naiyong Jing, Frans A. Audenaert, Thomas J. Blong, John C. Clark, Linda G. Cote, Harald Kaspar, Franz Marz
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Patent number: 6596806Abstract: To provide a filler-containing PTFE granular powder for molding, which has a high apparent density, a small electrostatic charge and excellent flowability and gives a molded article which is free from lowering of tensile strength and elongation and coloring attributable to a surfactant. Also a process for preparing the granular powder is provided. The granulation is carried out by wetting 100 parts by weight of a mixture of a PTFE powder and filler with 30 to 60 parts by weight of an aqueous solution containing an anionic surfactant in a concentration of not less than 10 times and less than 40 times the critical micelle concentration and then applying mechanical force to the mixture.Type: GrantFiled: June 26, 2001Date of Patent: July 22, 2003Assignee: Daikin Industries, Ltd.Inventors: Michio Asano, Tetsuo Shimizu, Shoji Kawachi
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Patent number: 6579620Abstract: A water-repellent coating has tetrafluoroethylene resin powder, silicone resin binder, and organic solvent. The tetrafluoroethylene resin powder has a ratio of the peak absorbance at 1,800 cm−1 to the peak absorbance at 500 cm−1 of 0.0001 to 0.05 exclusive. A coating film is formed by applying such a coating on a substrate. The coating has the properties of high water repellency, excellent anti-ice-coating, excellent anti-snow-coating, and so on, in spite of not having a large amount of fluororesin powder. In addition, the coating of film keeps the water repellency regardless of whether the coating film is immersed into water for a long time.Type: GrantFiled: November 14, 2001Date of Patent: June 17, 2003Assignees: NTT Advanced Technology Corp., Nippon Telegraph and Telephone Corp.Inventors: Seiichiro Mizuno, Chiemi Nishi, Yasuhiro Tsukamoto, Masaie Fujino, Tsutomu Yanagawa, Takehito Ota, Hiroki Yonezawa, Ken-ichi Takai, Goro Yamauchi
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Publication number: 20030109631Abstract: An aqueous ionomer gel having a high viscosity, particularly a proton conducting ionomer, as well as to related products incorporating such gels. Such aqueous ionomer gels are suitable for suspending catalysts for formation of catalyst inks, which in turn are suitable for screen printing on a variety of surfaces. Representative surfaces are the electrode or membrane surfaces in an electrochemical fuel cell. Methods for making aqueous ionomer gels are also disclosed.Type: ApplicationFiled: December 12, 2001Publication date: June 12, 2003Applicant: Ballard Power Systems Inc.Inventors: Wesley Gervais, Michael V. Lauritzen, Kristi M. Zychowka, Lawrence A. Vanderark, Kevin Michael Colbow
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Patent number: 6566440Abstract: A polytetrafluoroethylene agglomerated product obtained from a polytetrafluoroethylene powder and a coke powder, wherein the polytetrafluoroethylene powder contains at least 8.3 mass % of a polytetrafluoroethylene fine powder having a particle diameter of from 0.1 to 9.5 &mgr;m, and the mass ratio of the polytetrafluoroethylene powder/the coke powder is 95-60/5-40.Type: GrantFiled: November 14, 2001Date of Patent: May 20, 2003Assignee: Asahi Glass Company, LimitedInventors: Satoru Kuroki, Takamichi Ishikawa, Masumi Nomura, Tadao Chiba
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Patent number: 6538058Abstract: A PTFE composition comprising a dispersion-polymerized polytetrafluoroethylene (PTFE) and a filler, wherein the powder irregular shape ratio of the PTFE is at most 50%, and a PTFE granulated product obtained by granulating the PTFE composition. The composition is produced by jetting high pressure water to a mixture comprising the dispersion-polymerized PTFE and the filler. The dispersion-polymerized PTFE composition and granulated product thus obtained are suitable for molding.Type: GrantFiled: September 24, 2001Date of Patent: March 25, 2003Assignees: Asahi Glass Company, Limited, Asahi Glass Fluoropolymers Co., Ltd.Inventors: Shigeki Kobayashi, Shinya Higuchi, Hideo Katsu, Mitsuharu Morozumi, Satoru Kuroki
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Patent number: 6521697Abstract: To provide an un-sintered polytetrafluoroethylene processed article which has an un-sintered polytetrafluoroethylene layer formed by coating and/or impregnating with an aqueous dispersion of PTFE and is characterized in that a content of alkyl phenols detected from the un-sintered PTFE layer is not more than 0.1 ppm. The un-sintered PTFE-processed article scarcely contains alkyl phenols which are suspected as chemical substances having endocrine disrupting activity.Type: GrantFiled: January 26, 2001Date of Patent: February 18, 2003Assignee: Dainkin Industries, Ltd.Inventors: Toshiro Miura, Yoshihiro Soda, Tadao Hayashi
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Patent number: 6515064Abstract: To provide an elastomer molded article for a semiconductor manufacturing equipment which not only has cleanliness required but also has an excellent plasma resistance and an excellent property of metal-elution inhibition. The elastomer molded article is obtained by crosslinking a crosslinkable elastomer composition comprising a crosslinkable elastomer component and a carbon black filler having an average particle size of not more than 700 &mgr;m and an impurity metal content measured by an ashing analysis method of not more than 300 ppm and has an impurity metal content measured by an ashing analysis method of not more than 100 ppm. An increasing rate of particles generated by irradiating oxygen plasma to the article is not more than 500% or an amount of impurity metals extracted from the article with a 50% aqueous solution of HF is not more than 500 ppb.Type: GrantFiled: July 6, 2001Date of Patent: February 4, 2003Assignee: Daikin Industries, Ltd.Inventors: Hiroyuki Tanaka, Masanori Hasegawa, Tsuyoshi Noguchi, Katsuhiko Higashino
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Patent number: 6512041Abstract: A crosslinkable fluororubber composition comprising (A) a polymer comprising a perfluoro compound having at least two alkenyl groups and a divalent perfluoroalkylene or perfluoropolyether structure a compound having at least two hydrosilyl groups, the hydrosilyl-bearing compound being added to some of the alkenyl groups in the perfluoro compound, (B) a reinforcing filler, and (C) a crosslinking agent having a hydrosilyl group and capable of addition reaction or a peroxide crosslinking agent, and (D) a surface treating agent having at least one fluoroalkenyl group and silanol group in the molecule, is roll millable and compression moldable. It cures into products having satisfactory solvent resistance, chemical resistance, heat resistance, and low-temperature properties.Type: GrantFiled: August 15, 2001Date of Patent: January 28, 2003Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Yasuhisa Osawa, Shinichi Sato, Takashi Matsuda
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Publication number: 20030013787Abstract: Highly fluorinated ion-exchange polymers achieve dissolution in aqueous tetrahydrofuran at lower pressures and temperatures than in other solvents, with few or no side products being formed.Type: ApplicationFiled: July 12, 2002Publication date: January 16, 2003Inventor: Qun Sun
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Patent number: 6503988Abstract: A polytetrafluoroethylene fine powder excellent in powder flowability which comprises fine particles (the primary particle) having a mean particle diameter of 0.05 to 1 &mgr;m, an apparent density of 0.52 to 0.70 g/ml, a standard specific gravity (SSG) of 2.14 to 2.23, and a secondary mean particle diameter of 100 to 1000 &mgr;m, antidripping agent using the above polytetrafluoroethylene fine powder, flame resistive resin composition containing this powder, and composition for inhibiting dust characteristics containing this powder.Type: GrantFiled: April 23, 1998Date of Patent: January 7, 2003Assignee: Daikin Industries, Ltd.Inventors: Takahiro Kitahara, Kazutaka Hosokawa, Tetsuo Shimizu
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Patent number: 6498207Abstract: A composition comprising from 30 to 65 wt % of fine particles of PTFE, and, based on PTFE, from 2 to 12 wt % of C10H21CH(CH3)CH2O(C2H4O)9C3H6OH and at least 0.01 wt % and less than 1 wt % of a polyethylene oxide having an average molecular weight of from 100,000 to 2,000,000.Type: GrantFiled: August 24, 2000Date of Patent: December 24, 2002Assignee: Asahi Glass Fluoropolymers Co. Ltd.Inventors: Jun Hoshikawa, Shigeki Kobayashi
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Publication number: 20020193500Abstract: A fluoroclastomer latex is produced that is capable of forming films having excellent water resistance. In a first step, polymerization of fluorinated monomers is carried out in the presence of fluorinated surfactants at a pH of 3-8. The pH of the resultant fluoroelastomer emulsion composition is then adjusted to 5-9 and the emulsion is concentrated to yield a solids-rich latex.Type: ApplicationFiled: August 28, 2001Publication date: December 19, 2002Inventors: Klaus Hintzer, Gernot Lohr, Albert Killich, Werner Schwertfeger
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Patent number: 6476144Abstract: Spherulites in a molded article obtained from a melt-processable crystalline fluorine-containing resin composition are minimized to give the transparent molded article having a smooth surface and being resistant to contamination. An agent for minimizing spherulite size which comprises an amorphous fluorine-containing polymer or a fluorine-containing multi-segment polymer. The fluorine-containing multi-segment polymer comprises an amorphous segment and a crystalline segment.Type: GrantFiled: January 28, 2000Date of Patent: November 5, 2002Assignee: Daikin Industries, Ltd.Inventors: Ken Okanishi, Minoru Yoshida, Tatsuo Suzuki, Tetsuo Shimizu, Takahisa Aoyama
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Patent number: 6476120Abstract: A refrigerant composition is disclosed which includes lubricants. The refrigerant composition includes formulations for use in automotive, residential or building air conditioning units. The refrigerant composition includes 25% to 35% by weight of a refrigerant, 60% to 70% by weight of a lubricating oil, and 0.5% to 10% by weight of polytetrafluoroethylene particles. The polytetrafluoroethylene particles range in size from 0.2 &mgr;m to 8.0 &mgr;m.Type: GrantFiled: August 1, 2000Date of Patent: November 5, 2002Inventor: Anthony Dave Bowers
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Patent number: 6465577Abstract: Spherulites in a molded article obtained from a melt-processable crystalline fluorine-containing resin composition are minimized to give the transparent molded article having a smooth surface and being resistant to contamination. An agent for minimizing spherulite size which comprises an amorphous fluorine-containing polymer or a fluorine-containing multi-segment polymer. The fluorine-containing multi-segment polymer comprises an amorphous segment and a crystalline segment.Type: GrantFiled: April 11, 2001Date of Patent: October 15, 2002Assignee: Daikin Industries, Ltd.Inventors: Ken Okanishi, Minoru Yoshida, Tatsuo Suzuki, Tetsuo Shimizu, Takahisa Aoyama