Patents Assigned to DuPont Mitsui Fluorochemicals
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Publication number: 20100197861Abstract: A fluoropolymer molding process is provided for molding a mixture of at least two of fluoropolymers having different melting points at a temperature that is at or above the melting point of the fluoropolymer with the lowest melting point and is less than the melting point of the fluoropolymer with the highest melting point, and the resultant fluoropolymer molded product has excellent resistance to chemical and gas permeation and a low coefficient of linear expansion.Type: ApplicationFiled: April 6, 2010Publication date: August 5, 2010Applicant: DUPONT-MITSUI FLUOROCHEMICALS CO LTDInventor: Takao Nishio
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Publication number: 20100068622Abstract: An electrode binder composition comprising at least one metal chelate compound and at least one fluoropolymer. The binder composition used in a battery electrode improves the cohesion of the powdered active electrode material as well as the adhesion strength between the active material layer and the metallic current collector. The invention further relates to battery electrodes containing the binder composition for lithium ion secondary batteries and electric double layer capacitors.Type: ApplicationFiled: November 19, 2009Publication date: March 18, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANY DUPONT-MITSUI FLUOROCHEMICALS CO LTDInventors: Jian Wang, Masahiro Yamamoto, Ronald Earl Uschold
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Patent number: 7659335Abstract: A composition comprising an aqueous dispersion of fluoropolymer particles stabilized with a polyoxyethylene alkyl ether surfactant having a polydispersity index, Mw/Mn, of 1.15 or less, useful in compositions comprising electrode material.Type: GrantFiled: October 11, 2005Date of Patent: February 9, 2010Assignee: Dupont-Mitsui Fluorochemicals Co LtdInventor: Kazuo Konabe
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Publication number: 20100000771Abstract: The present invention is to significantly improve copper-foil adhesion strength (copper-foil peel strength) without roughening or blackening a copper-foil surface, and thereby to provide a copper-clad laminate used favorably in a high frequency range. The copper-clad laminate (101) for a single-sided printed-wiring board is formed by bonding a copper foil (4) onto a surface of an insulating substrate (2) with an LCP/PFA composite film (3) disposed in between. The insulating substrate (2) is made of a fluororesin prepreg 2A. The copper foil (4) is a rolled copper foil, the both surfaces of which are smooth and not roughened or blackened. The insulating substrate (2) and the copper foil (4) are bonded to each other with the composite film (3) disposed in between by firing and pressing them under temperature conditions which are 5° C. to 40° C. higher than the melting point of PFA and lower than the melting point of LCP.Type: ApplicationFiled: September 21, 2006Publication date: January 7, 2010Applicants: Nippon Pillar Packing Co., Ltd., Junkosha Inc., DuPont-Mitsui Fluorochemicals Co., Ltd.Inventors: Koichi Shimauchi, Hirofumi Ito, Jeong Chang Lee
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Publication number: 20090297751Abstract: Perfluoropolymer composites are provided which are obtained by dispersing layered-silicates having properties of swelling or cleaving in dispersion media in perfluoropolymers and having the ratio of the viscosity, V0.1, at 0.1 rad/sec by a parallel plate mode of a dynamic rheometer to the viscosity, V1, measured at 1 rad/sec is 1.5 or greater, viscosity being measured at 340° C. A method for making the perfluoropolymer composites is provided, and molded articles therefrom. And additionally, perfluoropolymer composites, where layered-silicates having properties of swelling or cleaving in dispersion media are dispersed in perfluoropolymers, with the storage elasticity of 2 times or higher than that of fluoropolymers, at temperatures greater than the glass transition temperature of perfluoropolymers.Type: ApplicationFiled: June 11, 2009Publication date: December 3, 2009Applicant: DUPONT-MITSUI FLUOROCHEMICALS CO LTDInventors: Pham Hoai Nam, Jeong Chang Lee, Kenji Oki, Hajime Sato
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Patent number: 7560005Abstract: The present invention provides fluoropolymer laminates having isotropic properties. For example, an embodiment in which multiple fluoropolymer sheets having a liquid crystalline polymer oriented in the fibrous state in the melt processible fluoropolymer are laminated, despite having the fibrous LCP oriented in one direction in each single extruded sheet, makes it possible to laminate in such a way as to compensate for their orientation directions, the laminate thereby becoming isotropic as regards physical properties. The laminates also have low linear coefficient of expansion and low thermal shrinkage as well as elevated tensile modulus and low dielectric constant.Type: GrantFiled: April 26, 2007Date of Patent: July 14, 2009Assignee: Dupont-Mitsui Fluorochemicals Co LtdInventors: Jeong Chang Lee, Shosaku Kondo
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Patent number: 7553907Abstract: Melt processible fluoropolymer containing functional groups such as hydroxyl and nitrile have antistatic properties that make them suitable in articles and parts for use in conditions where static electricity can be a problem, such as copying machines and fuel lines.Type: GrantFiled: August 23, 2004Date of Patent: June 30, 2009Assignee: DuPont-Mitsui Fluorochemicals Co LtdInventor: Jeong Chang Lee
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Patent number: 7544406Abstract: A functionalized fluoropolymer, preferably with phosphate functionality, can be coated on a metal oxide containing rubber substrate, which coating, after heating, results in a fluoropolymer-rubber substrate laminate without degradation of the rubber, and with good adhesion between the fluoropolymer and the rubber.Type: GrantFiled: July 27, 2005Date of Patent: June 9, 2009Assignee: Dupont-Mitsui Fluorochemicals Co LtdInventors: Osamu Hayakawa, Yuqing Liu, Yuji Mochizuki
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Patent number: 7439200Abstract: An improved circuit substrate is provided wherein glass cloth is completely embedded within fluoropolymer by thermocompression to form a composite structure, which when containing an adhesive agent such as the combination of functional groups and liquid crystal polymer is self-adhering to a metal layer such as of copper.Type: GrantFiled: August 17, 2006Date of Patent: October 21, 2008Assignee: DuPont-Mitsui Fluorochemicals Co. Ltd.Inventors: Jeong Chang Lee, Etsuya Taki
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Patent number: 7261937Abstract: The present invention provides fluoropolymer laminates having isotropic properties. For example, an embodiment in which multiple fluoropolymer sheets having an liquid crystalline polymer oriented in the fibrous state in the melt processible fluoropolymer are laminated, despite having the fibrous LCP oriented in one direction in each single extruded sheet, makes it possible to laminate in such a way as to compensate for their orientation directions, the laminate thereby becoming isotropic as regards physical properties. The laminates also have low linear coefficient of expansion and low thermal shrinkage as well as elevated tensile modulus and low-dielectric constant.Type: GrantFiled: May 15, 2006Date of Patent: August 28, 2007Assignee: Dupont-mitsui Fluorochemicals Co. Ltd.Inventors: Jeong Chang Lee, Shosaku Kondo
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Patent number: 7112383Abstract: The present invention is directed to a binder for electrode materials which comprises tetrafluoroethylene polymer fine particles having an average particle size of not more than about 0.20 ?m and having a standard specific gravity of not more than about 2.20, wherein a mixture prepared from said fine particles with about 17% by weight of the total mixture of an extrusion coagent, when subjected to the measurement of an extrusion pressure by a rheometer, exhibits under the conditions of a draw ratio of 100 to 1 and an extrusion speed of 18±2 mm/min, an extrusion pressure of not less than about 220 kg/cm2.Type: GrantFiled: November 19, 2003Date of Patent: September 26, 2006Assignee: DuPont-Mitsui Fluorochemicals Co. Ltd.Inventor: Kazuo Konabe
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Patent number: 7030191Abstract: A composition comprising tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer and PTFE micropowder with flex life superior to compositions made exclusively of tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer having equivalent perfluoro(alkyl vinyl ether) content and melt flow rate.Type: GrantFiled: August 23, 2005Date of Patent: April 18, 2006Assignee: DuPont Mitsui Fluorochemicals Co., Ltd.Inventor: Shinichi Namura
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Patent number: 6673416Abstract: The present invention relates to a molded article of polytetrafluoroethylene or modified polytetrafluoroethylene having a fluoropolymer resin coating, coating comprising a heat-flowable tetrafluoroethylene copolymer wherein the surface of the coated article has a reduced roughness compared to the molded article prior to coating. The coating for the molded article is preferably a fused powder, most preferably formed by electrostatically applying a fluoropolymer powder resin to the molded PTFE article. In a preferred embodiment, the fluoropolymer powder resin comprises a mixture of heat-flowable tetrafluoroethylene copolymer powder and a polytetrafluoroethylene that has a temperature of crystallization of at least 305° C. and a heat of crystallization of at least 50 J/g.Type: GrantFiled: February 4, 2000Date of Patent: January 6, 2004Assignee: DuPont Mitsui FluorochemicalsInventor: Takao Nishio
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Patent number: 6649699Abstract: A composition of tetrafluoroethylene/perfluoro(alkyl vinyl ether) having at least 4 wt % perfluoro(alkyl vinyl ether) and a melt flow rate of no greater than 4 g/10 min, and 5 to 30 wt % low molecular weight PTFE, has improved gas impermeability and also mechanical strength.Type: GrantFiled: November 16, 2001Date of Patent: November 18, 2003Assignee: DuPont Mitsui FluorochemicalsInventor: Shinichi Namura
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Patent number: 6586546Abstract: Aqueous copolymerization of TFE and PAVE in the presence of a small amount of terpene enables the manufacture of a more uniform melt-fabricable copolymer with a narrower molecular weight distribution. The copolymer exhibits improved flex life.Type: GrantFiled: June 14, 2001Date of Patent: July 1, 2003Assignee: DuPont-Mitsui Fluorochemicals Co. Ltd.Inventors: Takahiko Iwasaki, Masahiro Kino
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Patent number: 6582628Abstract: A method for producing an electrically conducting melt-processible fluoropolymer comprising pulverizing a composition of (a) carbon aggregate and (b) coagulum particles of aqueous dispersion polymerized melt-processible fluoropolymer, coating the coagulum particle with the disintegrated particles of carbon black. The preferred composition comprises a structured carbon black such as acetylene black and a melt processible fluoropolymer wherein said melt processible fluoropolymer has two crystallization peaks in a DSC cooling curve when allowed to crystallize from a temperature of not less than its melting point at a cooling rate of 12° C./min; and the ratio of the crystallization peak heights (high temperature side peak/low temperature side peak) is 0.65 or greater; and/or the ratio of the high temperature side crystallization peak area to the total area of the crystallization peaks [high temperature side peak area/(high temperature side peak area+low temperature side peak area)] is 0.Type: GrantFiled: May 21, 2002Date of Patent: June 24, 2003Assignee: DuPont Mitsui FluorochemicalsInventors: Shosaku Kondo, Kasuke Ishii, Hajime Sato, Jeong Chang Lee, Noriyuki Suzuki
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Patent number: 6426386Abstract: A melt processible fluoropolymer composition comprising a copolymer of tetrafluoroethylene with a perfluoro(alkyl vinyl ether), which copolymer is a mixture of a first fluorocarbon resin copolymer in which the alkyl group of the perfluoro(alkyl vinyl ether) has at least 3 carbons, and a second fluorocarbon resin copolymer in which the alkyl group of the perfluoro(alkyl vinyl ether) has 1 and/or 2 carbons, and the components of the blend are miscible in the amorphous regions and sometimes in the crystalling regions.Type: GrantFiled: January 23, 2001Date of Patent: July 30, 2002Assignee: DuPont-Mitsui Fluorochemicals Co. Ltd.Inventors: Jeong Chang Lee, Shosaku Kondo, Hajime Sato
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Patent number: 6228932Abstract: A fluororesin powder liquid dispersion comprising heat-flowable fluororesin powder, liquid dispersion medium having a surface tension of not more than 45 dyne/cm, and colloidal particles having an average particle size of not more than 1 &mgr;m provides thick corrosion resistant coated films. Preferred colloidal particles for the dispersion are particles of polyether sulfone (PES) which are added in an aqueous dispersion containing an organic solvent and a water-miscible solvent. An aqueous dispersion of PES colloidal particles having an average particle size of not more than 1 &mgr;m is preferably prepared by (1) dissolving PES in an organic solvent capable of solubilizing PES; (2) combining the dissolved PES with a water-miscible solvent which is capable of being dissolved in the organic solvent; and (3) combining water in which there is a dissolved surfactant with the dissolved PES.Type: GrantFiled: December 17, 1998Date of Patent: May 8, 2001Assignee: DuPont Mitsui FluorochemicalsInventor: Takumi Saito
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Patent number: 6153303Abstract: Fluoropolymer compositions containing melt-flowable tetrafluoroethylene copolymers with reactive end groups and isotropic polyesters have excellent adhesion to metal substrates, especially steel, and excellent water resistance.Type: GrantFiled: August 19, 1998Date of Patent: November 28, 2000Assignee: Dupont Mitsui FluorochemicalsInventors: Sinichi Namura, Takahiko Iwasaki
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Patent number: 5968642Abstract: An article having a water-repellent fluororesin surface and a method for manufacturing the same, wherein the article has a water-repellent fluororesin surface composed of an irregularly porous material which has a maximum IPA diffusion diameter of at least 8 mm and is formed by irregularly stacking fluororesin particles with an average diameter of no more than 40 microns over one another and has a water droplet roll angle tangent of no more than 50/500. The obtained article has a fluororesin surface which exhibits excellent water-repellency, inhibits adhesion of water drops and soil entrained by the water drops and imparts a great bond strength to the substrate.Type: GrantFiled: August 18, 1995Date of Patent: October 19, 1999Assignee: DuPont-Mitsui Fluorochemicals Co., Ltd.Inventor: Takumi Saito