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).

  • Patent number: 10253128
    Abstract: 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: Grant
    Filed: July 30, 2014
    Date of Patent: April 9, 2019
    Assignee: NICHIAS CORPORATION
    Inventors: Tomoya Shimizu, Ayumi Maezawa, Yuriko Sekimoto, Naoya Kuzawa
  • Publication number: 20160185892
    Abstract: 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: Application
    Filed: July 30, 2014
    Publication date: June 30, 2016
    Applicant: NICHIAS CORPORATION
    Inventors: Tomoya Shimizu, Ayumi Maezawa, Yuriko Sekimoto, Naoya Kuzawa
  • Publication number: 20160032039
    Abstract: 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: Application
    Filed: March 27, 2014
    Publication date: February 4, 2016
    Applicant: Nichias Corporation
    Inventors: Tomoya Shimizu, Ayumi Maezawa, Yuriko Sekimoto, Naoya Kuzawa
  • Publication number: 20150069721
    Abstract: 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: Application
    Filed: April 2, 2013
    Publication date: March 12, 2015
    Inventors: Hiroyasu Okafuji, Naoya Kuzawa, Hideaki Mori, Kojiro Otani
  • Publication number: 20140216636
    Abstract: 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: Application
    Filed: April 9, 2014
    Publication date: August 7, 2014
    Applicant: NICHIAS CORPORATION
    Inventors: Naoya Kuzawa, Hideyuki SHISHITANI
  • Patent number: 8722780
    Abstract: 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: Grant
    Filed: February 26, 2009
    Date of Patent: May 13, 2014
    Assignee: Nichias Corporation
    Inventors: Tomoya Shimizu, Naoya Kuzawa, Takeshi Kuboyama, Hideyuki Shishitani
  • Patent number: 7666948
    Abstract: 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: Grant
    Filed: December 27, 2005
    Date of Patent: February 23, 2010
    Assignee: Nichias Corporation
    Inventors: Seiji Aizawa, Tomoya Shimizu, Naoya Kuzawa, Hiroshi Saito
  • Publication number: 20090221758
    Abstract: 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: Application
    Filed: February 26, 2009
    Publication date: September 3, 2009
    Inventors: Tomoya Shimizu, Naoya Kuzawa, Takeshi Kuboyama, Hideyuki Shishitani
  • Publication number: 20090036586
    Abstract: 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: Application
    Filed: July 29, 2008
    Publication date: February 5, 2009
    Applicant: NICHIAS CORPORATION
    Inventors: Hideyuki Shishitani, Naoya Kuzawa, Takeshi Kuboyama
  • Publication number: 20080157486
    Abstract: 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: Application
    Filed: December 28, 2007
    Publication date: July 3, 2008
    Applicant: NICHIAS CORPORATION
    Inventors: Naoya Kuzawa, Hideyuki Shishitani
  • Publication number: 20080131644
    Abstract: 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: Application
    Filed: December 3, 2007
    Publication date: June 5, 2008
    Applicant: NICHIAS CORPORATION
    Inventors: Takeshi Kuboyama, Naoya Kuzawa
  • Patent number: 7220788
    Abstract: 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: Grant
    Filed: February 27, 2004
    Date of Patent: May 22, 2007
    Assignee: Nichias Corporation
    Inventors: Naoya Kuzawa, Mitsuyuki Nakano, Hitoshi Ogura, Masayuki Saito
  • Patent number: 7173094
    Abstract: 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: Grant
    Filed: September 20, 2002
    Date of Patent: February 6, 2007
    Assignees: 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
  • Publication number: 20060292373
    Abstract: 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: Application
    Filed: June 27, 2006
    Publication date: December 28, 2006
    Applicant: NICHIAS CORPORATION
    Inventors: Takeshi Kuboyama, Naoya Kuzawa
  • Publication number: 20060148991
    Abstract: 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: Application
    Filed: December 27, 2005
    Publication date: July 6, 2006
    Applicant: NICHIAS CORPORATION
    Inventors: Seiji Aizawa, Tomoya Shimizu, Naoya Kuzawa, Hiroshi Saito
  • Publication number: 20060047075
    Abstract: 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: Application
    Filed: August 29, 2005
    Publication date: March 2, 2006
    Applicant: NICHIAS CORPORATION
    Inventors: Tomoya Shimizu, Takeshi Kuboyama, Naoya Kuzawa, Hiroshi Saito
  • Publication number: 20050075461
    Abstract: 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: Application
    Filed: September 30, 2002
    Publication date: April 7, 2005
    Inventors: Kazuki Morimoto, Naoya Kuzawa, Hitoshi Ogura, Takumi Arisawa, Takeshi Kuboyama, Kinro Hashimoto, Hitoshi Yamada, Masayuki Saito, Tetsuya Miwa
  • Publication number: 20040220293
    Abstract: 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: Application
    Filed: March 23, 2004
    Publication date: November 4, 2004
    Applicant: Nichias Corporation
    Inventors: Naoya Kuzawa, Katsumi Watanabe, Mitsuyuki Nakano
  • Publication number: 20040171714
    Abstract: 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: Application
    Filed: February 27, 2004
    Publication date: September 2, 2004
    Applicant: NICHIAS CORPORATION
    Inventors: Naoya Kuzawa, Mitsuyuki Nakano, Hitoshi Ogura, Masayuki Saito