Patents by Inventor Nobuyuki Katacka

Nobuyuki Katacka 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).

  • Nitrile rubber composition having high modulus
    Patent number: 4332918
    Abstract: A method of preparing a nitrile rubber composition having modulus and excellent physical properties and abrasion resistance is disclosed. This composition is prepared by kneading at 120.degree.-160.degree. C. (a) a nitrile rubber, (b) an .alpha.,.beta.-ethylenically unsaturated carboxylic acid, (c) a divalent metal compound, (d) a secondary aryl amine, cooling the kneaded mass below 100.degree. C., adding to the kneaded mass (e) an organic peroxide, and heating and curing the resulting mixture at 110.degree.-180.degree. C. The addition of the secondary aryl amine considerably improves the physical properties of the composition. These compositions have not a tendency of scorching and are superior in the workability as compared with conventional carboxylated nitrile rubber compositions produced by emulsion polymerization.
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: June 1, 1982
    Assignee: Bridgestone Tire Co., Ltd.
    Inventors: Yoshihide Fukahori, Nobuyuki Katacka, Shiro Anzai