Patents Assigned to DuPont Mitsui Fluorochemicals Co., Ltd.
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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: 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: 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: 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
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Patent number: 5700859Abstract: An aqueous emulsion of fluorocarbon polymer according to the present invention is characterized by that the emulsion comprises a sodium dialkylsulfosuccinic acid of not less than 1.5% by weight relative to the fluorocarbon polymer, and an alkyleneglycol. A method for producing a stabilized aqueous emulsions of fluorocarbon polymer according to the present invention comprises mixing an aqueous emulsion of fluorocarbon polymer obtained by an emulsion polymerization process with a sodium dialkylsulfosuccinic acid dissolved in an alkyleneglycol or an aqueous solution of the alkyleneglycol. A novel aqueous emulsion of fluorocarbon polymer having excellent mechanical stability and thermal stability is obtainable.Type: GrantFiled: February 15, 1996Date of Patent: December 23, 1997Assignee: DuPont-Mitsui Fluorochemicals Co., Ltd.Inventors: Masatsune Ogura, Shizuo Chiba, Kayoko Ohtera
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Patent number: 5502097Abstract: 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 organic liquid with a boiling point of 150.degree.-340.degree. C. provides thick film fluororesin treatment by a single application.Type: GrantFiled: May 26, 1994Date of Patent: March 26, 1996Assignee: DuPont-Mitsui Fluorochemicals Co., Ltd.Inventor: Takumi Saito
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Patent number: 5473018Abstract: A tetrafluoroethylene/fluoroalkoxy trifluoroethylene copolymer (PFA) composition which has finer spherulite diameters compared to a conventional PFA is provided, so as to give fabricated articles having excellent surface smoothness, and which are free from problems, such as process contamination and the like, caused by leaching. This effect is obtained by incorporating into the composition prior to fabrication a polytetrafluoroethylene having a crystallization temperature of at least 305.degree. C. and a heat of crystallization of at least 50 J/g.Type: GrantFiled: June 22, 1994Date of Patent: December 5, 1995Assignee: DuPont-Mitsui Fluorochemicals Co., Ltd.Inventors: Shinichi Namura, Takao Nishio
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Patent number: 5151263Abstract: A process for the catalytic decomposition of chlorofluoro-alkanes commonly named as "flons" into harmless substances against destructing ozone layer of the stratosphere by using the catalyst comprising alumina or alumina -silica complexed oxide, wherein the range of Al/(Al+Si)atomic ratio is 1.0 to 0.5, in the presence of steam at the temperature of 350.degree. to 1.000.degree. C.Type: GrantFiled: July 25, 1990Date of Patent: September 29, 1992Assignee: Dupont-Mitsui Fluorochemicals Co., Ltd.Inventors: Susumu Okazaki, Akito Kurosaki
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Patent number: 5118887Abstract: A partially fluorinated alumina catalyst having a determined component, which is obtained by calcining an Al.sub.2 O.sub.3.nH.sub.2 O(n=0 to 3) containing fibril of polytetrafluoroethylene, provides an excellent catalyst for the isomerization of HCFCs.Type: GrantFiled: March 28, 1991Date of Patent: June 2, 1992Assignee: DuPont-Mitsui Fluorochemicals Co., Ltd.Inventors: Susumu Okazaki, Masatsune Ogura, Yasunobu Mochizuki
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Patent number: 5118492Abstract: A process for the catalytic decomposition of chlorofluoro-alkanes commonly named as "flons" into harmless substances against destructing ozone layer of the stratosphere by using the catalyst comprising iron oxide supported on active carbon at the temperature more than 300.degree. C. in the presence of steam.Type: GrantFiled: July 16, 1990Date of Patent: June 2, 1992Assignee: Dupont-Mitsui Fluorochemicals Co., Ltd.Inventors: Susumu Okazaki, Akito Kurosaki