Patents by Inventor Tsunemasa Yumoto

Tsunemasa Yumoto 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).

  • Transparent, impact-resistant, thermoplastic resin composition having excellent chemical resistance and process for producing same
    Patent number: 4767833
    Abstract: A thermoplastic resin composition obtained by graft-polymerizing 95 to 50 parts by weight of a monomer mixture comprising a vinyl aromatic compound monomer and an acrylic compound monomer and optionally a vinyl cyanide compound monomer in the presence of 5 to 50 parts by weight of a rubbery substance consisting of styrene-butadiene copolymers, characterized in that the rubbery substance comprises (A) 40 to 80% by weight of a styrene-butadiene copolymer having a number-average particle diameter of at least 0.05 .mu.m and less than 0.2 .mu.m, a gel content of 30 to 100% by weight and a bound styrene content of 10 to 40% by weight and (B) 60 to 20% by weight of a styrene-butadiene copolymer having a number-average particle diameter of 0.2 to 3 .mu.m, a gel content of 10 to 80% by weight and a bound styrene content of 10 to 40% by weight and the total content of the components (A) and (B) in the rubbery substance is at least 80% by weight.
    Type: Grant
    Filed: September 26, 1986
    Date of Patent: August 30, 1988
    Assignee: Japan Synthetic Rubber Co., Ltd.
    Inventors: Tsunemasa Yumoto, Yoshio Nakanishi, Kazuki Iwai, Tadahiko Itoh