Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1980-10-28
1982-09-28
Padgett, Benjamin R.
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
252500, 252512, 252514, 3581285, H01B 106
Patent
active
043517471
ABSTRACT:
An improvement is provided in and relating to a capacitance-type record medium wherein an information signal is recorded as a variation in the geometrical shape of its surface area, and is played back by the variation of the capacitance between its surface and an electrode of a reproducing stylus scanning the surface of the record medium relatively which occurs according to a variation in the geometrical shape of its surface area. The improvement consists in the fact that at least the surface area of the record medium is formed of (1) a material composed of an electrically conductive substance and a copolymer consisting of 98 to 65% by weight of vinyl chloride, 2 to 20% by weight of an alkyl vinyl ether with the alkyl group having 4 to 18 carbon atoms and/or a vinyl ester of a fatty acid in which the fatty acid residue has 4 to 18 carbon atoms and 0 to 15% by weight of another monomer copolymerizable with these compounds, or (2) a material composed of an electrically conductive substance and a polymer mixture consisting of at least two polymers in which the proportions of the constituent monomers are the same as in the aforesaid copolymer.
REFERENCES:
patent: 3833541 (1974-09-01), Shen
patent: 3960790 (1976-06-01), Khanna
patent: 3975321 (1976-08-01), Herberger
patent: 4151132 (1981-04-01), Khanna
Abe Takaharu
Miyamoto Kazumichi
Nakamura Mamoru
Nishizawa Akira
Okuda Takao
Barr J. L.
Nippon Zeon Co. Ltd.
Padgett Benjamin R.
Victor Company of Japan , Limited
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