Patents by Inventor Chie Sawauchi
Chie Sawauchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11827724Abstract: It is an object of the present invention to provide polytetrafluoroethylene suitable for forming a porous polytetrafluoroethylene film using a high water-soluble surfactant with high volatility. Polytetrafluoroethylene has non-melt-secondary-processability, standard specific gravity of 2.160 or less, an average primary particle size of 150 nm or more, stress relaxation time of 500 seconds or more, and break strength of 29.7 N or more. The polytetrafluoroethylene is obtainable by emulsion polymerization of tetrafluoroethylene in the presence of a fluorinated surfactant with Log POW of 3.4 or less.Type: GrantFiled: March 30, 2010Date of Patent: November 28, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Makoto Ono, Hiroyuki Sato, Chie Sawauchi, Taketo Kato
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Patent number: 8540901Abstract: The present invention provides an aqueous fluororesin dispersion comprising a melt-processable fluororesin which is low in fluorinated surfactant concentration and excellent in dispersion stability even when the concentration of the melt-processable fluororesin is high. The present invention is related to an aqueous fluororesin dispersion comprising a melt-processable fluororesin particle dispersed in an aqueous medium, wherein a concentration of the melt-processable fluororesin is 55 to 75% by mass relative to the aqueous fluororesin dispersion, and a fluorinated surfactant content in the aqueous fluororesin dispersion is not higher than a level corresponding to 100 ppm of the melt-processable fluororesin.Type: GrantFiled: December 8, 2011Date of Patent: September 24, 2013Assignee: Daikin Industries, Ltd.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Patent number: 8362168Abstract: The present invention provides an aqueous fluoropolymer dispersion having good mechanical characteristics and storage stability and containing substantially no fluorinated surfactant. The present invention is related to an aqueous fluoropolymer dispersion comprising a dispersed fluoropolymer particle with an average primary particle diameter of 50 to 400 nm, a surface layer of the dispersed fluoropolymer particle being obtained by emulsion polymerization of a monomer composition consisting of 99.999 to 98 mole percent of tetrafluoroethylene and 0.001 to 2 mole percent of a modifier monomer, a fluorinated surfactant content being not higher than 50 ppm, a fluoropolymer content being 20 to 75% by mass, and a nonfluorinated nonionic surfactant content being 2 to 15% by mass relative to 100% by mass of the fluoropolymer.Type: GrantFiled: August 8, 2011Date of Patent: January 29, 2013Assignee: Daikin Industries, Ltd.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Patent number: 8299155Abstract: An object of the present invention is to provide an aqueous fluoropolymer dispersion inhibited from viscosity rising and excellent in mechanical stability in spite of a low fluorinated surfactant concentration. The invention provides an aqueous fluoropolymer dispersion comprising particles of a fluoropolymer as dispersed in an aqueous medium wherein a fluorinated surfactant (A) having a molecular weight lower than 1000 amounts to not higher than 100 ppm of the mass of the fluoropolymer, the aqueous fluoropolymer dispersion containing an anionic surfactant (B) other than the fluorinated surfactant (A) as well as a water-soluble polymer (C).Type: GrantFiled: February 24, 2011Date of Patent: October 30, 2012Assignee: Daikin Industries, Ltd.Inventors: Chie Sawauchi, Nobuhiko Tsuda, Wade Martin Simpson
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Patent number: 8202955Abstract: The present invention provides an aqueous fluoropolymer dispersion having good mechanical characteristics and storage stability and containing substantially no fluorinated surfactant. The present invention is related to an aqueous fluoropolymer dispersion comprising a dispersed fluoropolymer particle with an average primary particle diameter of 50 to 400 nm, a surface layer of the dispersed fluoropolymer particle being obtained by emulsion polymerization of a monomer composition consisting of 99.999 to 98 mole percent of tetrafluoroethylene and 0.001 to 2 mole percent of a modifier monomer, a fluorinated surfactant content being not higher than 50 ppm, a fluoropolymer content being 20 to 75% by mass, and a nonfluorinated nonionic surfactant content being 2 to 15% by mass relative to 100% by mass of the fluoropolymer.Type: GrantFiled: July 5, 2007Date of Patent: June 19, 2012Assignee: Daikin Industries, Ltd.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Publication number: 20120077915Abstract: The present invention provides an aqueous fluororesin dispersion comprising a melt-processable fluororesin which is low in fluorinated surfactant concentration and excellent in dispersion stability even when the concentration of the melt-processable fluororesin is high. The present invention is related to an aqueous fluororesin dispersion comprising a melt-processable fluororesin particle dispersed in an aqueous medium, wherein a concentration of the melt-processable fluororesin is 55 to 75% by mass relative to the aqueous fluororesin dispersion, and a fluorinated surfactant content in the aqueous fluororesin dispersion is not higher than a level corresponding to 100 ppm of the melt-processable fluororesin.Type: ApplicationFiled: December 8, 2011Publication date: March 29, 2012Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Chie SAWAUCHI, Nobuhiko TSUDA
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Publication number: 20120028046Abstract: It is an object of the present invention to provide polytetrafluoroethylene suitable for forming a porous polytetrafluoroethylene film using a high water-soluble surfactant with high volatility. Polytetrafluoroethylene has non-melt-secondary-processability, standard specific gravity of 2.160 or less, an average primary particle size of 150 nm or more, stress relaxation time of 500 seconds or more, and break strength of 29.7 N or more. The polytetrafluoroethylene is obtainable by emulsion polymerization of tetrafluoroethylene in the presence of a fluorinated surfactant with LogPOW of 3.4 or less.Type: ApplicationFiled: March 30, 2010Publication date: February 2, 2012Applicant: DAIKIN INDUSTRIES LTD.Inventors: Makoto Ono, Hiroyuki Sato, Chie Sawauchi, Taketo Kato
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Publication number: 20110294945Abstract: The present invention provides an aqueous fluoropolymer dispersion having good mechanical characteristics and storage stability and containing substantially no fluorinated surfactant. The present invention is related to an aqueous fluoropolymer dispersion comprising a dispersed fluoropolymer particle with an average primary particle diameter of 50 to 400 nm, a surface layer of the dispersed fluoropolymer particle being obtained by emulsion polymerization of a monomer composition consisting of 99.999 to 98 mole percent of tetrafluoroethylene and 0.001 to 2 mole percent of a modifier monomer, a fluorinated surfactant content being not higher than 50 ppm, a fluoropolymer content being 20 to 75% by mass, and a nonfluorinated nonionic surfactant content being 2 to 15% by mass relative to 100% by mass of the fluoropolymer.Type: ApplicationFiled: August 8, 2011Publication date: December 1, 2011Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Chie SAWAUCHI, Nobuhiko TSUDA
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Patent number: 7968644Abstract: The present invention provides a method of producing a fluororesin aqueous dispersion which can produce a fluororesin aqueous dispersion low in fluorine-containing surfactant concentration and high in polytetrafluoroethylene concentration with high efficiency. The invention provides a method of producing a fluororesin aqueous dispersion which comprises subjecting a crude fluororesin aqueous dispersion comprising a polytetrafluoroethylene particle dispersed in an aqueous medium to treatment with an ion-exchange resin and to treatment for concentration by phase separation in the presence of an electrolyte and/or a fluorine-free anionic surfactant.Type: GrantFiled: June 21, 2007Date of Patent: June 28, 2011Assignee: Daikin Industries, Ltd.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Patent number: 7968625Abstract: A process for producing an aqueous fluoropolymer dispersion which includes adding a specific compound to a to-be-treated aqueous fluoropolymer dispersion containing a particle of fluoropolymer dispersed therein, the to-be-treated aqueous fluoropolymer dispersion containing a fluorinated surfactant (A) with a molecular weight lower than 1000 in an amount of 100 ppm or less of the fluoropolymer and the specific compound being (1) a sulfosuccinic acid alkyl ester or a salt thereof, or a sulfosuccinic acid fluoroalkyl ester or a salt thereof, (2) the fluorinated surfactant (A), (3) a fluorinated surfactant (B) with a molecular weight lower than 1000, differing from the fluorinated surfactant (A) and/or (4) an aliphatic carboxylic acid or a salt thereof, which compound is added in total amount of 10 to 5000 ppm of said fluoropolymer.Type: GrantFiled: June 9, 2006Date of Patent: June 28, 2011Assignee: Daikin Industries, Ltd.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Publication number: 20110144255Abstract: An object of the present invention is to provide an aqueous fluoropolymer dispersion inhibited from viscosity rising and excellent in mechanical stability in spite of a low fluorinated surfactant concentration. The invention provides an aqueous fluoropolymer dispersion comprising particles of a fluoropolymer as dispersed in an aqueous medium wherein a fluorinated surfactant (A) having a molecular weight lower than 1000 amounts to not higher than 100 ppm of the mass of the fluoropolymer, the aqueous fluoropolymer dispersion containing an anionic surfactant (B) other than the fluorinated surfactant (A) as well as a water-soluble polymer (C).Type: ApplicationFiled: February 24, 2011Publication date: June 16, 2011Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Chie SAWAUCHI, Nobuhiko TSUDA, Wade Martin SIMPSON
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Publication number: 20100222491Abstract: The present invention has an object to provide an aqueous fluoropolymer dispersion which is excellently prevented from foaming without significant impairment in viscosity and in mechanical stability. The present invention is related to an aqueous fluoropolymer dispersion comprising a particle of fluoropolymer as dispersed in an aqueous medium in the presence of a specific nonionic surfactant, wherein the specific nonionic surfactant comprises a compound having an average total hydrophilic group content of 45 to 90% by mass, each hydrocarbon group in the compound constituting the specific nonionic surfactant is only a hydrocarbon group of 1 to 5 consecutively neighboring carbon atoms, and the fluorinated surfactant in the aqueous fluoropolymer dispersion amounts to 500 ppm or less of the solid matter of the fluoropolymer.Type: ApplicationFiled: December 28, 2006Publication date: September 2, 2010Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Chie Sawauchi, Nobuhiko Tsuda, Toshirou Miura
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Publication number: 20100168301Abstract: It is an object of the present invention to provide an aqueous fluoropolymer dispersion which will not send out any amine-like odor in spite of its having been brought into contact with an anion exchange resin as well as a method of producing the same. This invention is related to an aqueous fluoropolymer dispersion containing a nitrogen-containing organic base and/or a salt thereof, together with a particle of fluoropolymer dispersed therein wherein said nitrogen-containing organic base and/or the salt thereof amounts, in total, to 0 to 1 ppm of said aqueous fluoropolymer dispersion.Type: ApplicationFiled: June 23, 2006Publication date: July 1, 2010Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Patent number: 7714047Abstract: The present invention provides a method of producing a fluoropolymer aqueous dispersion by which the fluorine-containing emulsifier contained in the fluoropolymer aqueous dispersion as obtained after polymerization can be efficiently removed as well as a fluoropolymer aqueous dispersion low in fluorine-containing emulsifier concentration. The present invention is a method of producing a fluoropolymer aqueous dispersion which comprises carrying out a concentration treatment comprising a concentration operation of a pretreatment fluoropolymer aqueous dispersion, wherein the pretreatment fluoropolymer aqueous dispersion is obtained by carrying out a polymerization in an aqueous medium in the presence of a fluorine-containing surfactant (A), the fluorine-containing surfactant (A) is a fluorine-containing surfactant having an octanol/water partition coefficient of 1.5 to 3.5.Type: GrantFiled: June 1, 2009Date of Patent: May 11, 2010Assignee: Daikin Industries, Ltd.Inventors: Nobuhiko Tsuda, Chie Sawauchi, Yasuhiko Sawada, Tetsuo Shimizu
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Patent number: 7696268Abstract: The present invention provides a method of producing a fluoropolymer aqueous dispersion by which the fluorine-containing emulsifier contained in the fluoropolymer aqueous dispersion as obtained after polymerization can be efficiently removed as well as a fluoropolymer aqueous dispersion low in fluorine-containing emulsifier concentration. The present invention is a method of producing a fluoropolymer aqueous dispersion which comprises carrying out a concentration treatment comprising a concentration operation of a pretreatment fluoropolymer aqueous dispersion, wherein the pretreatment fluoropolymer aqueous dispersion is obtained by carrying out a polymerization in an aqueous medium in the presence of a fluorine-containing surfactant (A), the fluorine-containing surfactant (A) is a fluorine-containing surfactant having an octanol/water partition coefficient of 1.5 to 3.5.Type: GrantFiled: October 29, 2004Date of Patent: April 13, 2010Assignee: Daikin Industries, Ltd.Inventors: Nobuhiko Tsuda, Chie Sawauchi, Yasuhiko Sawada, Tetsuo Shimizu
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Publication number: 20090312443Abstract: The present invention provides a method of obtaining good aqueous fluoropolymer dispersions low in fluorinated surfactant content by efficiently removing the fluorinated surfactant through pH adjustment. The present invention is related to a method of producing an aqueous fluoropolymer dispersion comprising a contact treatment for brining a raw aqueous fluoropolymer dispersion into contact with an anion exchanger, and the contact treatment being carried out while a pH of the raw aqueous fluoropolymer dispersion is adjusted to 2 to 9.Type: ApplicationFiled: July 6, 2007Publication date: December 17, 2009Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Publication number: 20090286932Abstract: The present invention provides an aqueous fluoropolymer dispersion having good mechanical characteristics and storage stability and containing substantially no fluorinated surfactant. The present invention is related to an aqueous fluoropolymer dispersion comprising a dispersed fluoropolymer particle with an average primary particle diameter of 50 to 400 nm, a surface layer of the dispersed fluoropolymer particle being obtained by emulsion polymerization of a monomer composition consisting of 99.999 to 98 mole percent of tetrafluoroethylene and 0.001 to 2 mole percent of a modifier monomer, a fluorinated surfactant content being not higher than 50 ppm, a fluoropolymer content being 20 to 75% by mass, and a nonfluorinated nonionic surfactant content being 2 to 15% by mass relative to 100% by mass of the fluoropolymer.Type: ApplicationFiled: July 5, 2007Publication date: November 19, 2009Applicant: Daikin Industries, LTD.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Publication number: 20090278092Abstract: The present invention provides an aqueous fluororesin dispersion comprising a melt-processable fluororesin which is low in fluorinated surfactant concentration and excellent in dispersion stability even when the concentration of the melt-processable fluororesin is high. The present invention is related to an aqueous fluororesin dispersion comprising a melt-processable fluororesin particle dispersed in an aqueous medium, wherein a concentration of the melt-processable fluororesin is 55 to 75% by mass relative to the aqueous fluororesin dispersion, and a fluorinated surfactant content in the aqueous fluororesin dispersion is not higher than a level corresponding to 100 ppm of the melt-processable fluororesin.Type: ApplicationFiled: June 28, 2007Publication date: November 12, 2009Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Chie Sawauchi, Nobuhiko Tsuda
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Publication number: 20090239994Abstract: The present invention provides a method of producing a fluoropolymer aqueous dispersion by which the fluorine-containing emulsifier contained in the fluoropolymer aqueous dispersion as obtained after polymerization can be efficiently removed as well as a fluoropolymer aqueous dispersion low in fluorine-containing emulsifier concentration. The present invention is a method of producing a fluoropolymer aqueous dispersion which comprises carrying out a concentration treatment comprising a concentration operation of a pretreatment fluoropolymer aqueous dispersion, wherein the pretreatment fluoropolymer aqueous dispersion is obtained by carrying out a polymerization in an aqueous medium in the presence of a fluorine-containing surfactant (A), the fluorine-containing surfactant (A) is a fluorine-containing surfactant having an octanol/water partition coefficient of 1.5 to 3.5.Type: ApplicationFiled: June 1, 2009Publication date: September 24, 2009Applicant: DAIKIN INDUSTRIES, INC.Inventors: Nobuhiko Tsuda, Chie Sawauchi, Yasuhiko Sawada, Tetsuo Shimizu
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Patent number: 7592484Abstract: The present invention relates to a method for producing carbonyl difluoride comprising a step of reacting trifluoromethane with oxygen or an oxygen-containing gas while heating.Type: GrantFiled: April 26, 2005Date of Patent: September 22, 2009Assignee: Daikin Industries, Ltd.Inventors: Seiji Takubo, Takuji Kume, Akinori Yamamoto, Chie Sawauchi, Hisako Nakamura