# US 4,396,660 A · Electroconductive resin composition and a videodisc record

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- Number: US 4,396,660 A
- Document ID: US4396660A
- Status: Granted
- Kind: A
- Application number: 06/367,988
- Filed: 1982-04-13
- Granted: 1983-08-02
- Earliest claimed: 1981-04-22
- Assignees: Tokuyama Sekisui Kogyo Kabushiki Kaisha
- Inventors: Akio Hata; Hiroshi Kake; Noriki Fujii
- Web page: https://patentgrep.com/patent/US4396660A

## CPC

- H01B 1/24: the conductive material comprising carbon-silicon compounds, carbon or silicon
- C08K 3/04: Carbon
- G11B 9/068: {Moulding resin compositions}
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

An electroconductive resin composition is a blend of 5-30% by weight of carbon black and a graft-polymer. The graft-polymer is obtained by graft-polymerizing 99-76 parts by weight of monomeric vinyl chloride to 1-15 parts by weight of an ethylene-vinyl acetate copolymer, the ethylene-vinyl acetate copolymer containing 10-65% by weight of vinyl acetate. The electroconductive resin composition has superior heat resistance and mechanical strength and improved flowability and heat stability. The electroconductive resin composition is particularly suitable for preparing videodisc records.

## Claims

### Claim 1

A videodisc record prepared by forming into a thin disc an electroconductive resin composition comprising a blend of 5 to 30% by weight of carbon black with a graftpolymer obtained by graft-polymerizing 99 to 76 parts by weight of monomeric vinyl chloride to 1 to 15 parts by weight of ethylene-vinyl acetate copolymer, said copolymer containing therein 10 to 65% by weight of vinyl acetate.