US4396660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroconductive resin composition and a videodisc record
Assignee: Tokuyama Sekisui Co Ltd
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Filing: 1982-04-13
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Granted: 1983-08-02
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Expires: 2002-04-13
Abstract
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.
Inventors
- 👤 Akio Hata
- 👤 Hiroshi Kake
- 👤 Noriki Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:39
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; G; G11; G11B; G11B9/00; G11B9/06; G11B9/061; G11B9/063; G11B9/068
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
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.
Claim 2
Dependent Claim
65 words
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.
References Cited (Backward Citations)
US3960790A
Cited
JPS53116104A
Cited
US4151132A
Cited
US4241120A
Cited
US4228050A
Cited
US4280941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |