High density information record medium using carbon black particles surface-treated with silicone oil
AssigneeVictor Company of Japan, Ltd.
InventorsToshiaki Hamaguchi, Kazuhira Namikawa, Mutsuaki Nakamura, Akio Kuroda, Toshio Akai
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Abstract
High density information signal recording media of an electrostatic capacitance type, in which an information signal is recorded as geometric variations. The medium consists of a conductive resin composition which comprises a vinyl chloride resin, carbon black particles and a silicone oil lubricant. The carbon black particles are treated with a silicone oil to have the oil coated thereon.
Claims5
A high density information signal recording medium of an electrostatic capacitance type in which signal information is recorded as geometric variations, the medium consisting of a conductive resin composition comprising a vinyl chloride resin, 5 to 30 parts by weight of carbon black particles individually having a coating of a silicone oil used in an amount of 0.1 to 10 wt% of the carbon black particles, and from 0.1 to less than 0.5 parts by weight of a silicone oil lubricant, both based on 100 parts by weight of the vinyl chloride resin.
Dependencies are inferred from the claim text.