Patents by Inventor Mitsuyoshi Aonuma

Mitsuyoshi Aonuma 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: 5541258
    Abstract: A thermoplastic elastomer composition comprising (A) a thermoplastic copolyester or copolyamide elastomer, (B) an epoxy group-containing methacrylate or acrylate copolymer rubber and (C) a carboxyl group-containing methacrylate or acrylate copolymer rubber, wherein the content of component (A) is 30-90 wt. %, the total content of components (B) and (C) is 10-70 wt. %, and components (B) and (C) are crosslinked with each other. The composition provides flexible rubber articles having enhanced modulus, heat aging resistance and compression set resistance.
    Type: Grant
    Filed: October 16, 1995
    Date of Patent: July 30, 1996
    Assignees: Nippon Zeon Co., Ltd., General Electric Company
    Inventors: Mitsuyoshi Aonuma, Kimiaki Sasamoto, Kozo Ikegami
  • Patent number: 5432226
    Abstract: A rubber formulation including (a) a hydrogenated nitrile rubber, (b) an organopolysiloxane, (c) a cross-linking controller selected from (i) an ester or polyester of acrylic or methacrylic acid with a polyhydric alcohol, (ii) an amide or polyamide of acrylic or methacrylic acid with a polyamine, (iii) an alkoxysilane having a C.dbd.C double bond, an amino group or a mercapto group and (iv) triallyl isocyanate, (d) an optional filler, and (e) a peroxide crosslinking agent. The rubber formulation is prepared by mixing together (a') a hydrogenated nitrile rubber composition having added therein an optional filler, (b') an organopolysiloxane composition having added therein an optional filler, and (c) the crosslinking controller, and thereafter adding (e) the peroxide crosslinking agent.
    Type: Grant
    Filed: February 17, 1993
    Date of Patent: July 11, 1995
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Shigeru Okamura, Meyer Soria, Paul Branlard
  • Patent number: 5231138
    Abstract: A thermoplastic and elastomeric composition comprising a polyamide resin and a rubber component, wherein the rubber component is dispersed in the form of crosslinked particles in the polyamide resin.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: July 27, 1993
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Tatsunosuke Suzuki, Satoru Isomura, Koichi Nishimura
  • Patent number: 5157083
    Abstract: A rubber composition comprising a polymer obtained by adding maleic anhydride or a derivative thereof to a nitrile-group-containing highly saturated polymer rubber having an iodine value of 80 or less, which can be widely utilized in belts, hoses such as for hydraulic ones.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: October 20, 1992
    Assignee: Nippon Zeon Co Ltd
    Inventors: Mitsuyoshi Aonuma, Hiroshi Sakakida, Yoshiaki Aimura
  • Patent number: 5019630
    Abstract: A novel rubbery copolymer comprising (A) 5 to 95% by weight of structural units based on 1,1-dicyano-2-vinylcyclopropane and (B) 95 to 5% by weight of structural units based on a 1,1-difluoro-2-vinylcyclopropane and having a weight average molecular weight, calculated for standard polystyrene, of 2,000 to 2,000,000 is provided by copolymerizing the 1,1-dicyano-2-vinylcyclopropane and the 1,1-difluoro-2-vinylcyclopropanes in the presence of a free radical initiator. This rubbery copolymer and its hydrogenated product give a vulcanizate having improved oil resistance, cold resistance, thermal resistance, sour gasoline resistance, alcohol-containing gasoline resistance and alcohol-containing sour gasoline resistance.
    Type: Grant
    Filed: October 24, 1989
    Date of Patent: May 28, 1991
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Takeshi Chida, Mitsuyoshi Aonuma, Akio Maeda, Yukihiko Morozumi, Tetsu Ohishi
  • Patent number: 4996264
    Abstract: A thermoplastic and elastomeric composition comprising a polyamide resin and a rubber component, wherein the rubber component is dispersed in the form of crosslinked particles in the polyamide resin.
    Type: Grant
    Filed: August 23, 1988
    Date of Patent: February 26, 1991
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Tatsunosuke Suzuki, Satoru Isomura, Koichi Nishimura
  • Patent number: 4897446
    Abstract: A rubber composition comprising(1) 10 to 90% by weight of at least one of a butyl rubber and a halogenated butyl rubber as a first rubber component, and(2) 90 to 10% by weight of an epichlorohydrin rubber as a second rubber component,at least part of at least one of said rubbers (1) and (2) being modified with maleic anhydride or its derivative.
    Type: Grant
    Filed: September 30, 1988
    Date of Patent: January 30, 1990
    Assignee: Nippon Zeon Co., Ltd.
    Inventor: Mitsuyoshi Aonuma
  • Patent number: 4885341
    Abstract: A rubber composition comprising 20 to 70% by weight of a first rubber component which is butyl rubber, a halogenated butyl rubber or a mixture of both as a first rubber component and 80 to 30% by weight of a second rubber component which is at least one rubber selected from chlorinated polyethylene rubber, chlorosulfonated polyethylene rubber and epichlorohydrin rubber, the first rubber component being dispersed as crosslinked rubber particles in the second rubber component.
    Type: Grant
    Filed: June 29, 1988
    Date of Patent: December 5, 1989
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Nagatoshi Sugi
  • Patent number: 4816519
    Abstract: A rubber composition comprising a rubbery copolymer containing an acenaphthylene-type monomer as a copolymer component or a mixture of it with another rubber, and compounding agents. This composition gives a rubber vulcanizate having high strength and high modulus.
    Type: Grant
    Filed: January 4, 1988
    Date of Patent: March 28, 1989
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Koichi Nishimura
  • Patent number: 4689377
    Abstract: A vulcanizate of a copolymer rubber comprising 15 to 70 mol % of an alkylene sulfide, 30 to 85 mol % of an epihalohydrin and 0 to 15 mol % of an unsaturated epoxide, said vulcanizate being used in contact with an alcohol mixed gasoline.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: August 25, 1987
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Akio Maeda, Hirokatsu Seya
  • Patent number: 4647625
    Abstract: A process for modifying a polymer of a conjugated diene, which comprises reacting a polymer of a conjugated diene containing at least one metal selected from alkali metals and alkaline earth metals with a compound having a linkage of the following formula ##STR1## wherein X represents an oxygen or sulfur atom, in the molecule.
    Type: Grant
    Filed: December 21, 1984
    Date of Patent: March 3, 1987
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Mitsuyoshi Aonuma, Hiroyuki Watanabe, Haruki Kawada, Kohkichi Noguchi, Akio Ueda, Shuichi Akita, Tetsuo Ohyama, Toshio Kase
  • Patent number: 4569958
    Abstract: An elastomeric composition whose scorch is inhibited comprises [I] a halogen-containing elastomer, [II] a di- or tri-thiol-s-triazine compound and [III] at least one polycarboxylic acid compound selected from the group consisting of (A) a polycarboxylic acid having at least two carboxyl groups capable of forming an acid anhydride group in the molecule and (B) a halogen-substituted polycarboxylic acid anhydride.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: February 11, 1986
    Assignee: Nippon Zeon Co Ltd
    Inventors: Akio Maeda, Mitsuyoshi Aonuma, Masahiko Muranishi
  • Patent number: 3968316
    Abstract: A process for the surface treatment of a rubber or synthetic resin containing ethylenic unsaturation by contacting the rubber or resin with an alkyl hypohalite and a compound containing an active hydrogen and a functional group, thereby improving or providing the rubber or resin in or with such properties as adhesion, printability, dyeability, flame retardation, self-extinction, antistatic property, weatherproofing, adsorbency, ion-exchangeability and anti-permeability.
    Type: Grant
    Filed: October 1, 1973
    Date of Patent: July 6, 1976
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Yoshio Jyo, Yoshio Wada, Mitsuyoshi Aonuma, Takeo Kobayashi, Kyouzi Inokuchi