Patent US4465615A successfully refreshed from Google Patents.
US4465615A
Expired / Lapsed
US
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Electroconductive resin composition and a videodisc record
Assignee: Tokuyama Sekisui Co Ltd
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Filing: 1983-04-26
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Granted: 1984-08-14
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Expires: 2003-04-26
Abstract
Abstract An electroconductive resin composition is a blend of 5-30% by weight 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 ethylenevinyl acetate copolymer, the ethylenevinyl 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 video disc records.
Inventors
- 👤 Akio Hata
- 👤 Hiroshi Kake
- 👤 Noriki Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:21
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: 5
Claim 1
Independent Claim
59 words
An electroconductive resin composition consisting essentially of blend of 5 to 30% by weight of carbon black and a graftpolymer which is obtained by graft-polymerizing 99 to 76 parts by weight of monomeric vinyl chloride to 1 to 15 parts by weight of an ethylene-vinyl acetate copolymer, said copolymer containing therein 10 to 65% by weight of vinyl acetate.
Claim 2
Dependent Claim
59 words
An electroconductive resin composition consisting essentially of blend of 5 to 30% by weight of carbon black and a graftpolymer which is obtained by graft-polymerizing 99 to 76 parts by weight of monomeric vinyl chloride to 1 to 15 parts by weight of an ethylene-vinyl acetate copolymer, said copolymer containing therein 10 to 65% by weight of vinyl acetate.
Claim 3
Dependent Claim
19 words
An electroconductive resin composition according to claim 1 wherein the graft-polymer has a polymerization degree between 300 and 550.
Claim 4
Dependent Claim
30 words
A electroconductive resin composition according to claim 1 or 2 wherein the ethylene-vinyl acetate copolymer is prepared according to either a high pressure polymerization method or a solution polymerization method.
Claim 5
Dependent Claim
54 words
An electroconductive resin composition according to claim 3 wherein the graft-polymer is a polymer obtained by graft-polymerizing to said ethylene-vinyl acetate copolymer simultaneously the monomeric vinyl chloride and less than 10% by weight based on the monomeric vinyl chloride of a monomer selected from the group consisting of monomeric ethylene, propylene and vinyl acetate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |