Electroconductive resin composition and a videodisc record

Patent 4396660 Issued on August 2, 1983. Estimated Expiration Date:

April 13, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Disc record and method of compounding disc record composition
Patent #: 3960790
Issued on: 06/01/1976
Inventor: Khanna

Molding composition
Patent #: 4151132
Issued on: 04/24/1979
Inventor: Khanna

Conductive molding composition
Patent #: 4228050
Issued on: 10/14/1980
Inventor: Martin , et al.

Video discs and molding compositions therefor
Patent #: 4241120
Issued on: 12/23/1980
Inventor: Datta , et al.

Video discs and molding compositions therefor Patent #: 4280941
Issued on: 07/28/1981
Inventor: Datta , et al.

Inventors

Assignee

Tokuyama Sekisui Kogyo Kabushiki Kaisha

Application

No. 06/367988 filed on 04/13/1982

US Classes:

428/64.2, Recording medium or carrier252/511, Resin, rubber, or derivative thereof containing523/174, Phonograph record molding composition or process of preparing524/504Solid graft or solid graft-type copolymer with other solid polymer, SICP, or SPFI

Examiners

Primary: Bleutge, John C.
Assistant: Lilling, Herbert J.

Attorney, Agent or Firm

Armstrong, Nikaido, Marmelstein & Kubovcik

International Classes

C08K 3/00 (20060101)
C08K 3/04 (20060101)
G11B 9/00 (20060101)
H01B 1/24 (20060101)
G11B 9/06 (20060101)

Foreign Application Priority Data

1981-04-22 JP

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.

Other References

Derwent Abs. 67916 Y/38 Fuji Photo J52096505 (8-1977)
Derwent Abs. 56053 D/31 Mitsubishi Petroch (6-1981)
Derwent Abs. 72876 E/35 Tokyo Shibaura (7-1982)
RCA Review vol. 39, No. 1, pp. 86 to 115 published in Mar., 1978 by RCA Research and Engineering