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
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
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