Patents by Inventor Naoya Kuzawa
Naoya Kuzawa 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: 10253128Abstract: A crosslinking agent includes a compound represented by the following formula (1). In the formula (1), R1, R2, and R3 are independently a fluorine atom, an alkyl group, a fluoroalkyl group, or a substituted or unsubstituted aryl group, a plurality of R1 are identical or different, a plurality of R2 are identical or different, a plurality of R3 are identical or different, provided that at least one of R1, R2, and R3 is a fluorine atom or a fluorine atom-containing group, m is an integer of from 2 to 6, l is an integer of from 0 to 2, and each hydrogen on the benzene ring(s) is optionally substituted with a substituent.Type: GrantFiled: July 30, 2014Date of Patent: April 9, 2019Assignee: NICHIAS CORPORATIONInventors: Tomoya Shimizu, Ayumi Maezawa, Yuriko Sekimoto, Naoya Kuzawa
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Publication number: 20160185892Abstract: A crosslinking agent includes a compound represented by the following formula (1). In the formula (1), R1, R2, and R3 are independently a fluorine atom, an alkyl group, a fluoroalkyl group, or a substituted or unsubstituted aryl group, a plurality of R1 are identical or different, a plurality of R2 are identical or different, a plurality of R3 are identical or different, provided that at least one of R1, R2, and R3 is a fluorine atom or a fluorine atom-containing group, m is an integer of from 2 to 6, l is an integer of from 0 to 2, and each hydrogen on the benzene ring(s) is optionally substituted with a substituent.Type: ApplicationFiled: July 30, 2014Publication date: June 30, 2016Applicant: NICHIAS CORPORATIONInventors: Tomoya Shimizu, Ayumi Maezawa, Yuriko Sekimoto, Naoya Kuzawa
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Publication number: 20160032039Abstract: A method for producing a cross-linked fluoroelastomer including cross-linking a fluoroelastomer with a cross-linking agent in an inert gas atmosphere in the presence of an initiator.Type: ApplicationFiled: March 27, 2014Publication date: February 4, 2016Applicant: Nichias CorporationInventors: Tomoya Shimizu, Ayumi Maezawa, Yuriko Sekimoto, Naoya Kuzawa
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Publication number: 20150069721Abstract: A metal gasket 10 is provided with a columnar part 11 formed in a cylindrical shape; a beam part 12 that extends in a radial direction over the entire outer peripheral surface of the columnar part 11; and a circumferential groove 13 formed in the middle of a peripheral surface of the beam part 12; wherein the first sealing part 111 and the third sealing part 112 are formed as protruded parts, the second sealing part 122 is formed by deformation of a disk part 121 on one end side and the fourth sealing part 124 is formed by deformation of a disk part 123 on the other end side.Type: ApplicationFiled: April 2, 2013Publication date: March 12, 2015Inventors: Hiroyasu Okafuji, Naoya Kuzawa, Hideaki Mori, Kojiro Otani
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Publication number: 20140216636Abstract: A rubber/resin composite seal material having a base material of a rubbery elastomer and a fluororesin film that comes into contact with a fluid to be sealed, bonded to the base material with an adhesive. The seal is resistant to deterioration by reactive materials such as plasma, chemicals and heat yet remains flexible and may be repeatedly compressed. The rubber/resin composite seal material may be formed into the shape of an O-ring or other sealing structure.Type: ApplicationFiled: April 9, 2014Publication date: August 7, 2014Applicant: NICHIAS CORPORATIONInventors: Naoya Kuzawa, Hideyuki SHISHITANI
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Patent number: 8722780Abstract: The present invention provides a perfluoroelastomer composition comprising: a perfluoroelastomer having a nitrogen-containing curing site; and a catalyst mixture comprising: a tertiary amine; and an organic dicarboxylic acid represented by general formula (1) or (2) in an amount of 0.4 to 2 mol per mol of the tertiary amine: HOOC—COOH??(1) HOOC-A-COOH??(2) wherein A in formula (2) is an alkyl group having 1 to 10 carbon atoms or a phenyl group, which may be partially or fully fluorinated. Also disclosed is a perfluoroelastomer molded article obtained from the composition.Type: GrantFiled: February 26, 2009Date of Patent: May 13, 2014Assignee: Nichias CorporationInventors: Tomoya Shimizu, Naoya Kuzawa, Takeshi Kuboyama, Hideyuki Shishitani
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Patent number: 7666948Abstract: The present invention provides an elastomer composition comprising a mixture of (A) a perfluoroelastomer and (B) at least one elastomer selected from fluorine rubbers, silicone rubbers and ethylene-propylene based rubbers, in a mixing ratio (A/B) of from 0.5/99.5 to 80/20 in terms of weight ratio.Type: GrantFiled: December 27, 2005Date of Patent: February 23, 2010Assignee: Nichias CorporationInventors: Seiji Aizawa, Tomoya Shimizu, Naoya Kuzawa, Hiroshi Saito
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Publication number: 20090221758Abstract: The present invention provides a perfluoroelastomer composition comprising: a perfluoroelastomer having a nitrogen-containing curing site; and a catalyst mixture comprising: a tertiary amine; and an organic dicarboxylic acid represented by general formula (1) or (2) in an amount of 0.4 to 2 mol per mol of the tertiary amine: HOOC—COOH??(1) HOOC-A-COOH??(2) wherein A in formula (2) is an alkyl group having 1 to 10 carbon atoms or a phenyl group, which may be partially or fully fluorinated. Also disclosed is a perfluoroelastomer molded article obtained from the composition.Type: ApplicationFiled: February 26, 2009Publication date: September 3, 2009Inventors: Tomoya Shimizu, Naoya Kuzawa, Takeshi Kuboyama, Hideyuki Shishitani
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Publication number: 20090036586Abstract: The present invention provides a halogen gas-resistant perfluoro elastomer molded article obtained by molding and crosslinking a composition comprising: (A) 100 parts by mass of a perfluoro elastomer comprising copolymerization units comprising (A1) a perfluoro olefin; (A2) a perfluorovinyl ether; and (A3) a curing site monomer selected from the group consisting of an olefin fluoride having a nitrile group, a vinyl fluoride ether having a nitrile group and a mixture thereof, the curing site monomer (A3) being contained in an amount of 1.0 to 8.0 mol %; and (B) 0.1 to 10 parts by mass of a specific crosslinking agent represented by the following formula (a).Type: ApplicationFiled: July 29, 2008Publication date: February 5, 2009Applicant: NICHIAS CORPORATIONInventors: Hideyuki Shishitani, Naoya Kuzawa, Takeshi Kuboyama
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Publication number: 20080157486Abstract: The present invention provides a rubber/resin composite seal material comprising: a base material comprising a rubbery elastomer; and a fluororesin film bonded to the base material with an adhesive.Type: ApplicationFiled: December 28, 2007Publication date: July 3, 2008Applicant: NICHIAS CORPORATIONInventors: Naoya Kuzawa, Hideyuki Shishitani
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Publication number: 20080131644Abstract: The present invention provides a fluororubber molded article having a fluorinated surface, wherein the fluorinated surface has a ratio of the number of oxygen atoms to the number of fluorine atoms of 0.11 or less, and a ratio of the number of C—H bonds to the number of C—F2 bonds is 1.0 or less, and wherein the fluororubber molded article shows a leak amount 3 minutes after initiation of a helium leak test of 1.0×10?12 Pa·m3/sec or less.Type: ApplicationFiled: December 3, 2007Publication date: June 5, 2008Applicant: NICHIAS CORPORATIONInventors: Takeshi Kuboyama, Naoya Kuzawa
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Patent number: 7220788Abstract: The present invention relates to a fluororubber molded article obtained by subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation, wherein the fluororubber composition comprises: (i) a raw rubber having a metal element content of 1.5% or less and comprising a tetrafluoroethylene-propylene copolymer; and (ii) a prepolymer of triallyl isocyanurate. Also disclosed is a method for producing the fluororubber molded article.Type: GrantFiled: February 27, 2004Date of Patent: May 22, 2007Assignee: Nichias CorporationInventors: Naoya Kuzawa, Mitsuyuki Nakano, Hitoshi Ogura, Masayuki Saito
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Patent number: 7173094Abstract: Moldings of fluoro rubbers produced by crosslinking a tetrafluoroethylene/propylene copolymer or a tetrafluoroethylene/propylene/vinylidene fluoride copolymer, which have metal contents of 1.5% by mass or below in terms of metal elements and are suitable for use applications necessitating clean environment, for example, manufacturing or carrier equipment for semiconductors, manufacturing equipment, carriers, or storage containers for food, or medical supplies.Type: GrantFiled: September 20, 2002Date of Patent: February 6, 2007Assignees: Nichias Corporation, Asahi Glass Co., Ltd.Inventors: Kazuki Morimoto, Naoya Kuzawa, Hitoshi Ogura, Takumi Arisawa, Takeshi Kuboyama, Kinro Hashimoto, Hitoshi Yamada, Masayuki Saito, Tetsuya Miwa
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Publication number: 20060292373Abstract: A film of a fluorine-type resin having a thickness of 500 ?m or less is formed on a surface of an elastomer molded article by a vacuum deposition method. The resultant elastomer molded article having the film of the fluorine-type resin has a sticking force to a metal of 100 N or less in an environment of from 200° C. to 300° C. and has a weight reduction ratio of 1.0% by weight or less by irradiation of a mixed plasma containing oxygen and carbon tetrafluoride.Type: ApplicationFiled: June 27, 2006Publication date: December 28, 2006Applicant: NICHIAS CORPORATIONInventors: Takeshi Kuboyama, Naoya Kuzawa
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Publication number: 20060148991Abstract: The present invention provides an elastomer composition comprising a mixture of (A) a perfluoroelastomer and (B) at least one elastomer selected from fluorine rubbers, silicone rubbers and ethylene-propylene based rubbers, in a mixing ratio (A/B) of from 0.5/99.5 to 80/20 in terms of weight ratio.Type: ApplicationFiled: December 27, 2005Publication date: July 6, 2006Applicant: NICHIAS CORPORATIONInventors: Seiji Aizawa, Tomoya Shimizu, Naoya Kuzawa, Hiroshi Saito
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Publication number: 20060047075Abstract: In order to provide a fluoro-rubber composite which hardly reduces a clean degree of a manufacturing environment and in which any of cracks is hardly generated, a rubber material using the same, and a method of manufacturing a fluoro-rubber molded product, a fluoro rubber is mixed with a tetrafluoroethylene/propylene system copolymer or a tetrafluoroethylene/propylene/vinylidenefluoride system copolymer, and a fluorine thermoplastic resin, and the resulting mixture is compounded with a peroxide cross-linking agent, and a co-cross-linking agent, and if necessary, any other suitable filler or the like, thereby obtaining a fluoro-rubber composite, and cross-linking is performed for the resulting fluoro-rubber composite, thereby obtaining a fluoro-rubber molded product.Type: ApplicationFiled: August 29, 2005Publication date: March 2, 2006Applicant: NICHIAS CORPORATIONInventors: Tomoya Shimizu, Takeshi Kuboyama, Naoya Kuzawa, Hiroshi Saito
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Publication number: 20050075461Abstract: Moldings of fluoro rubbers produced by crosslinking a tetrafluoroethylene/propylene copolymer or a tetrafluoroethylene/propylene/vinylidene fluoride copolymer, which have metal contents of 1.5% by mass or below in terms of metal elements and are suitable for use applications necessitating clean environment, for example, manufacturing or carrier equipment for semiconductors, manufacturing equipment, carriers, or storage containers for food, or medical supplies.Type: ApplicationFiled: September 30, 2002Publication date: April 7, 2005Inventors: Kazuki Morimoto, Naoya Kuzawa, Hitoshi Ogura, Takumi Arisawa, Takeshi Kuboyama, Kinro Hashimoto, Hitoshi Yamada, Masayuki Saito, Tetsuya Miwa
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Publication number: 20040220293Abstract: The present invention provides a fluororubber molded article obtained by a process comprising subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation, wherein the fluororubber composition comprises: (i) a raw rubber which comprises a tetrafluoroethylene-propylene copolymer and which has a metal element content of 1.5% by weight or less; and (ii) silica which has a primary particle size of 0.5 &mgr;m or less and which has been treated to have a hydrophobic surface. Also disclosed is a method for producing the fluororubber molded article.Type: ApplicationFiled: March 23, 2004Publication date: November 4, 2004Applicant: Nichias CorporationInventors: Naoya Kuzawa, Katsumi Watanabe, Mitsuyuki Nakano
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Publication number: 20040171714Abstract: The present invention relates to a fluororubber molded article obtained by subjecting a fluororubber composition to crosslinking by irradiation of ionizing radiation, wherein the fluororubber composition comprises: (i) a raw rubber having a metal element content of 1.5% or less and comprising a tetrafluoroethylene-propylene copolymer; and (ii) a prepolymer of triallyl isocyanurate. Also disclosed is a method for producing the fluororubber molded article.Type: ApplicationFiled: February 27, 2004Publication date: September 2, 2004Applicant: NICHIAS CORPORATIONInventors: Naoya Kuzawa, Mitsuyuki Nakano, Hitoshi Ogura, Masayuki Saito