Patents by Inventor Masayoshi Nakazato

Masayoshi Nakazato 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, block copolymer composition and heat shrinkable films made thereof
    Patent number: 6107411
    Abstract: A block copolymer (hereinafter referred to as the block copolymer (I)), consisting essentially of a vinyl aromatic hydrocarbon and a conjugated diene and satisfying the following conditions (1) to (5):(1) the weight ratio of vinyl aromatic hydrocarbon units to conjugated diene units is from 60:40 to 90:10,(2) the number average molecular weight of the block copolymer is from 40,000 to 500,000,(3) the ratio of E'30/E'10, where E'30 is the storage modulus at a temperature of 30.degree. C. and E'10 is the storage modulus at a temperature of 10.degree. C., is from 0.75 to 1,(4) the block proportion of a vinyl aromatic hydrocarbon polymer contained in the block copolymer is from 70 to 100%, provided the block proportion=W1/W0.times.
    Type: Grant
    Filed: January 5, 1998
    Date of Patent: August 22, 2000
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hideki Toya, Masayoshi Nakazato, Hiroshi Suzuki