Patents by Inventor Kotaro Hayakawa

Kotaro Hayakawa 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).

  • Publication number: 20190177507
    Abstract: An additive for a rubber contains a compound represented by the following general formula (I) wherein R1 is a divalent hydrocarbon group having 1 or more and 20 or less carbon atoms; R2 and R3 are each independently a hydrogen atom or a hydrocarbon group having 1 or more and 6 or less carbon atoms; X is a hydrogen atom or a group represented by R4—COO—, R4—CONH— or R4—O—; and R4 is a hydrocarbon group having 1 or more and 20 or less carbon atoms.
    Type: Application
    Filed: June 16, 2017
    Publication date: June 13, 2019
    Applicants: BRIDGESTONE CORPORATION, KAO CORPORATION
    Inventors: Satomi FUJITA, Tetsuo TAKANO, Kotaro HAYAKAWA
  • Publication number: 20180371291
    Abstract: An object of the present invention is to provide a coating composition that is capable of providing a cured film excellent in adhesion to a base material and flexural fatigue resistance. Another object of the present invention is to provide a cured film obtained from the coating composition, and a laminate and a tire each having the cured film formed thereon. The coating composition of the present invention contains a polythiol compound (A), a polyurethane having an ethylenically unsaturated group (B), and a radical generator (C).
    Type: Application
    Filed: December 15, 2016
    Publication date: December 27, 2018
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tomohiro URATA, Shinichi MUSHA, Kotaro HAYAKAWA, Tatsuya FUNAKI, Akihide OOSAKU
  • Patent number: 9393838
    Abstract: Provided are a pressure-sensitive adhesive composition comprising, as a rubber component, at least two modified rubbers modified with a polar functional group and having different modification rates with each other, a laminate body comprising (A) a resin film layer and (B) a rubber elastic body layer wherein they are adhered via (C) the said pressure-sensitive adhesive composition, and a pneumatic tire having the said laminate body as an inner liner layer; and thus, provided are the pressure-sensitive adhesive composition that can firmly bond between the resin film layer and the rubber elastic body layer while the laminate body obtained therefrom does not generate cracks at low temperature, the laminate body using the said pressure-sensitive adhesive composition, and the pneumatic tire.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: July 19, 2016
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
  • Patent number: 9029462
    Abstract: The present invention provides an adhesive composition that may improve both adhesiveness to a film layer and adhesiveness to a rubber layer, and an adhesion method using the same, as well as a laminate and a tire. The adhesive composition according to the present invention includes a rubber component, at least 80 mass % of which rubber component is an epoxidized natural rubber.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: May 12, 2015
    Assignee: Bridgestone Corporation
    Inventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
  • Publication number: 20140087110
    Abstract: Provided are a pressure-sensitive adhesive composition comprising, as a rubber component, at least two modified rubbers modified with a polar functional group and having different modification rates with each other, a laminate body comprising (A) a resin film layer and (B) a rubber elastic body layer wherein they are adhered via (C) the said pressure-sensitive adhesive composition, and a pneumatic tire having the said laminate body as an inner liner layer; and thus, provided are the pressure-sensitive adhesive composition that can firmly bond between the resin film layer and the rubber elastic body layer while the laminate body obtained therefrom does not generate cracks at low temperature, the laminate body using the said pressure-sensitive adhesive composition, and the pneumatic tire.
    Type: Application
    Filed: April 2, 2012
    Publication date: March 27, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
  • Publication number: 20140048194
    Abstract: The present invention provides an adhesive composition that may improve both adhesiveness to a film layer and adhesiveness to a rubber layer, and an adhesion method using the same, as well as a laminate and a tire. The adhesive composition according to the present invention includes a rubber component, at least 80 mass % of which rubber component is an epoxidized natural rubber.
    Type: Application
    Filed: April 12, 2012
    Publication date: February 20, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi
  • Publication number: 20140030537
    Abstract: The present invention provides an adhesive composition that may improve both adhesiveness to a film layer and adhesiveness to a rubber layer, and an adhesion method using the same, as well as a laminate and a tire. The adhesive composition according to the present invention includes: a rubber component containing a diene-based elastomer; and a compound having a polar functional group in its molecule.
    Type: Application
    Filed: April 12, 2012
    Publication date: January 30, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takuya Ogasawara, Ryuji Nakagawa, Kotaro Hayakawa, Hideyuki Chiashi