Patents Assigned to Tokuyama Sekisui Industry, Corporation Limited
  • Patent number: 4906499
    Abstract: An information signal record medium of an electrostatic capacitance type in which a signal information is recorded as geometric variations is described. The medium is made of a conductive resin composition which comprises a vinyl chloride resin and 5 to 30 parts by weight of conductive particles based on 100 parts by weight of the vinyl chloride resin. The vinyl chloride resin is obtained by polymerizing at least one monomer for the vinyl chloride resin in which from 0.2 to 1 parts by weight of a lubricant per 100 parts by weight of the vinyl chloride resin is dissolved.
    Type: Grant
    Filed: July 5, 1988
    Date of Patent: March 6, 1990
    Assignees: Victor Company of Japan, Ltd., Tokuyama Sekisui Industry Corporation, Limited
    Inventors: Toshiaki Hamaguchi, Kazuhira Namikawa, Toshio Akai, Mutsuaki Nakamura, Akio Kuroda, Akio Hata, Noriki Fujii
  • Patent number: 4631717
    Abstract: High density information records formed from conductive resin compositions which comprise a graft polymer obtained by subjecting vinyl chloride monomer to graft polymerization with a copolymer of ethylene and vinyl acetate having a content of vinyl acetate of not less than 35 wt % and a melt index up to 20 and prepared according to a solution polymerization technique. The conductive composition further comprises predetermined amounts of a conductive material and a lubricant of a specific type. The lubricant is an ester between aliphatic acid and alcohol having a hydroxyl value not larger than 15.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: December 23, 1986
    Assignees: Victor Company of Japan, Ltd., Tokuyama Sekisui Industry Corporation, Limited
    Inventors: Kazuhira Namikawa, Toshiaki Hamaguchi, Mutsuaki Nakamura, Akio Kuroda, Akio Hata, Noriki Fujii
  • Patent number: 4592862
    Abstract: A conductive resin composition comprising a specific type of graft polymer of vinyl chloride and a vinyl chloride/acrylic ester copolymer, and a conductive powder used in an amount of from 10 to 30 wt % of the graft polymer. The conductive composition is particularly useful as video or digital audio discs.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: June 3, 1986
    Assignees: Victor Company of Japan, Ltd., Tokuyama Sekisui Industry, Corporation Limited
    Inventors: Mutsuaki Nakamura, Kazuhira Namikawa, Toshiaki Hamaguchi, Akio Kuroda, Akio Hata, Noriki Fujii