Patents by Inventor Kunihiko Muramori

Kunihiko Muramori 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).

  • Alkenyl aromatic compound-conjugated diene block copolymer and process for the production thereof
    Patent number: 4603155
    Abstract: An alkenyl aromatic compound-conjugated diene block copolymer having a combined alkenyl aromatic compound content of 25-95% by weight, characterized in that said copolymer is represented by the formula,A--B--Awherein A represents an alkenyl aromatic compound polymer block, the total amount of A's in both ends being 50-97% by weight of the total combined alkenyl aromatic compound content; B represents a conjugated diene-alkenyl aromatic compound copolymer block, said B portion having (a) 2-10 taper blocks where the amount of the alkenyl aromatic compound increases gradually and (b) a weight ratio of alkenyl aromatic compound/conjugated diene of 3-85/97-15; and the total amount of the chains that 1-4 alkenyl aromatic compound monomers are linked is 5-30% by weight of the total combined alkenyl aromatic compound content. Said copolymer is excellent in the balance of impact strength, tensile strength and elongation.
    Type: Grant
    Filed: March 5, 1984
    Date of Patent: July 29, 1986
    Assignee: Japan Synthetic Rubber Co., Ltd.
    Inventors: Kunihiko Muramori, Kazuo Yamamoto, Noboru Oshima, Yoshito Yoshimura