Patent US4412938A successfully refreshed from Google Patents.
US4412938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconducting resin compositions
Assignee: Mitsubishi Chemical Corp
•
Filing: 1980-10-20
•
Granted: 1983-11-01
•
Expires: 2000-10-20
Abstract
Abstract A semiconducting resin composition comprises: (A) 100 to 40 parts of a modified ethylene-vinyl acetate copolymer prepared by graft processing of 100 parts of an ethylene-vinyl acetate copolymer of a vinyl acetate content of less than 35 percent with 25 to 200 parts of an aromatic vinyl monomer; (B) 0 to 60 parts of a rubber; and (C) 3 to 150 parts of a carbon black with respect to 100 parts of the above described components (A) and (B), all quantities in "parts" and "percent" being by weight. A composition of this character has excellent characteristics for its use in forming the outer semiconducting layer of polyethylene-insulated cables.
Inventors
- 👤 Tetsuji Kakizaki
- 👤 Toshikazu Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:07
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L51/00; C08L51/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A semiconducting resin composition useful as a semiconducting layer of an insulated electric cable comprising: (A) 100 to 40 parts of a modified ethylene-vinyl acetate copolymer which is a product of graft processing of 100 parts of an ethylene-vinyl acetate copolymer of a vinyl acetate content of less than 35 percent with 25 to 200 parts of an aromatic vinyl monomer; (B) 0 to 60 parts of a rubber; and (C) 3 to 150 parts of an electrically conductive carbon black selected from the group consisting of furnace black, acetylene black, and ketjen black with respect to 100 parts of the above described components (A) and (B), all quantities in "parts" and "percent" being by weight.
Claim 2
Dependent Claim
116 words
A semiconducting resin composition useful as a semiconducting layer of an insulated electric cable comprising: (A) 100 to 40 parts of a modified ethylene-vinyl acetate copolymer which is a product of graft processing of 100 parts of an ethylene-vinyl acetate copolymer of a vinyl acetate content of less than 35 percent with 25 to 200 parts of an aromatic vinyl monomer; (B) 0 to 60 parts of a rubber; and (C) 3 to 150 parts of an electrically conductive carbon black selected from the group consisting of furnace black, acetylene black, and ketjen black with respect to 100 parts of the above described components (A) and (B), all quantities in "parts" and "percent" being by weight.
Claim 3
Dependent Claim
85 words
A semiconducting resin composition according to claim 1 in which the graft processing of the ethylene-vinyl acetate copolymer with the aromatic vinyl monomer comprises providing an aqueous dispersion of particles of the ethylene-vinyl acetate copolymer, the aromatic vinyl monomer, and a radical polymerization initiator, at least 80 percent by weight of the aromatic vinyl monomer having been impregnated in or adhered to the particles of the ethylene-vinyl acetate copolymer, and subjecting the aqueous dispersion to conditions conducive to initiating polymerization of the aromatic vinyl monomer.
Claim 4
Dependent Claim
120 words
A semiconducting resin composition according to claim 2 in which the aqueous dispersion is produced by heating at a temperature of room temperature to 50° C. an aqueous dispersion comprising particles of the ethylene-vinyl acetate copolymer, said aromatic vinyl monomer and the radical polymerization initiator, the decomposition temperature of said polymerization initiator for obtaining a half-life of 10 hours being 50° to 130° C., thereby to cause at least 80 percent by weight of the aromatic vinyl monomer to be impregnated in or to adhere to the particles of the ethylene-vinyl acetate copolymer, and in which the conditions conducive to initiating polymerization of the aromatic vinyl monomer comprise heating the aqueous dispersion at a temperature of 50° to 130° C.
Claim 5
Dependent Claim
96 words
A semiconducting resin composition according to claim 1 in which the aromatic vinyl monomer is a styrene monomer of the formula ##STR2## where R 1 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and each of R 2 through R 6 is a member selected from the group consisting of a hydrogen atom, a chlorine atom, and an alkyl group having 1 to 4 carbon atoms, and the rubber is a member selected from the group consisting of ethylene-propylene copolymer rubbers, styrene-conjugated diolefin block copolymer rubbers, and acrylonitrile-butadiene copolymer rubbers.
References Cited (Backward Citations)
US3162696A
Cited
US3218373A
Cited
US3178384A
Cited
USRE28336E
Cited
US3547756A
Cited
US3562090A
Cited
US3862056A
Cited
US3684821A
Cited
US3849345A
Cited
US4064198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |