Patents by Inventor Itsuo Ishii

Itsuo Ishii 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).

  • Block copolymer composition
    Patent number: 5075377
    Abstract: A block copolymer composition comprising(A) a tri-branched block copolymer (I) having a molecular weight of 150,000 to 450,000 represented by the general formula(A-B).sub.3 Xwherein A represents a polymer block of an aromatic vinyl monomer, B represents a polymer block of a conjugated diene monomer, and X represents a residue of a tri-functional or tetra-functional alkoxysilane coupling agent, and the weight ratio of the polymer block A to the polymer block B is from 10/90 to 30/70,(B) a di-branched block copolymer (II) having a molecular weight of 100,000 to 300,000 represented by the general formula(C-D).sub.
    Type: Grant
    Filed: June 22, 1990
    Date of Patent: December 24, 1991
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Ichiro Kawabuchi, Itsuo Ishii, Akinobu Satoh