Patents by Inventor Kouji Arakawa

Kouji Arakawa 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).

  • Low shrinkage unsaturated polyester resin compositions
    Patent number: 4322334
    Abstract: Unsaturated polyester resin compositions that have a low shrinking property, and at the same time, an enough strength are provided. The compositions comprises (1) 30-70 parts by weight of an unsaturated polyester obtained by reacting terephthalic acid and/or isophthalic acid and one or more of unsaturated acids selected from the group consisting of maleic anhydride, maleic acid and fumaric acid, with a glycol, and having the unsaturation degree of 1.5-5.0 and the acid value of 18-40, (2) 70-30 parts by weight of .alpha.,.beta.-ethylenically unsaturated monomer, and (3) 5-30 parts by weight of a thermoplastic resin having the number average molecular weight of 5,000-500,000.
    Type: Grant
    Filed: December 4, 1979
    Date of Patent: March 30, 1982
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Kouji Arakawa, Kanemasa Nomaguchi, Etsuji Iwami
  • Low shrinkage polyester resin compositions
    Patent number: 4251641
    Abstract: Unsaturated polyester resin compositions that have a low shrinking property, and at the same time, an enough strength are provided. The compositions comprises (1) 30-70 parts by weight of an unsaturated polyester obtained by reactin terephthalic acid and/or isophthalic acid and one or more of unsaturated acids selected from the group consisting of maleic anhydride, maleic acid and fumaric acid, with a glycol, and having the unsaturation degree of 1.5-5.0 and the acid value of 18-40, (2) 70-30 parts by weight of .alpha.,.beta.-ethylenically unsaturated monomer, and (3) 5-30 parts by weight of an amorphous linear saturated polyester resin obtained by reacting terephthalic acid and/or isophthalic acid with a glycol component.
    Type: Grant
    Filed: December 4, 1979
    Date of Patent: February 17, 1981
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Kouji Arakawa, Kanemasa Nomaguchi