Patent US4696765A successfully refreshed from Google Patents.
US4696765A
Expired / Lapsed
US
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Semiconductive resin composition
Assignee: Mitsubishi Chemical Corp
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Filing: 1984-10-18
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Granted: 1987-09-29
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Expires: 2004-10-18
Abstract
Abstract A semiconductive resin composition used in power cables having excellent properties is disclosed, which comprises 100 parts by weight of a base resin of at least one member selected from the group consisting of a low-density polyethylene, an ethylene/vinyl acetate copolymer having a vinyl acetate content of 25% by weight or less and an ethylene/(meth)acrylate copolymer having a (meth)acrylate content of 20% by weight or less, and 6 to 25 parts by weight of electroconductive carbon black having a DBP-absorption number of 220 to 340 ml/100 g and an impurity metal residue of 0.2% by weight or less.
Inventors
- 👤 Tetsuji Kakizaki
- 👤 Toshikazu Mizutani
- 👤 Hiroshi Yui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:23
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
91 words
A semiconductive resin composition comprising: (A) 100 parts by weight of a base resin of at least one member selected from the group consisting of a low-density polyethylene, an ethylene/vinyl acetate copolymer having a vinyl acetate content of 25% by weight or less and an ethylene/(meth)acrylate copolymer having a (meth)acrylate content of 20% by weight or less, and (B) 6 to 25 parts by weight of an electroconductive carbon black having a DBP-absorption number of 220 to 340 ml/100 g and an impurity metal residue of 0.2% by weight or less.
Claim 2
Dependent Claim
91 words
A semiconductive resin composition comprising: (A) 100 parts by weight of a base resin of at least one member selected from the group consisting of a low-density polyethylene, an ethylene/vinyl acetate copolymer having a vinyl acetate content of 25% by weight or less and an ethylene/(meth)acrylate copolymer having a (meth)acrylate content of 20% by weight or less, and (B) 6 to 25 parts by weight of an electroconductive carbon black having a DBP-absorption number of 220 to 340 ml/100 g and an impurity metal residue of 0.2% by weight or less.
Claim 3
Dependent Claim
33 words
A composition according to claim 1, wherein said component (A) is a low-density polyethylene having a density of 0.910 to 0.934 g/cm 3 and a melt index of 0.5 to 60 g/10 minutes.
Claim 4
Dependent Claim
28 words
A composition according to claim 1, wherein said component (A) is an ethylene homopolymer or a copolymer of ethylene with 10 mol % or less of other α-olefin.
Claim 5
Dependent Claim
15 words
A composition according to claim 3, wherein said other α-olefin is propylene, butene-1 or pentene-1.
Claim 6
Dependent Claim
26 words
A composition according to claim 1, wherein said component (A) is an ethylene/vinyl acetate copolymer having a vinyl acetate content of 15% by weight or less.
Claim 7
Dependent Claim
25 words
A composition according to claim 1, wherein said component (A) is an ethylene/vinyl acetate copolymer having a melt index of 0.5 to 50 g/10 minutes.
Claim 8
Dependent Claim
24 words
A composition according to claim 1, wherein said component (A) is an ethylene/(meth)acrylate copolymer having a (meth)acrylate content of 15% by weight or less.
Claim 9
Dependent Claim
27 words
A composition according to claim 1 or claim 7, wherein said component (A) is an ethylene/(meth)acrylate copolymer having a melt index of 0.5 to 50 g/10 minutes.
Claim 10
Dependent Claim
15 words
A composition according to claim 8, wherein said component (A) is an ethylene/ethyl acrylate copolymer.
Claim 11
Dependent Claim
115 words
A composition according to claim 1, wherein said component (B) is an electroconductive carbon black obtained in the simultaneous production of electroconductive carbon and synthesis gas by the partial oxidation of a liquid hydrocarbon in a furnace in the presence of molecular oxygen and steam under conditions that the carbon atom/hydrogen atom weight ratio in said liquid hydrocarbon is 9 or more, the temperature in the furnace falls in the range of 1,200° C. to 1,500° C., the pressure in the furnace falls in the range of 10 to 80 kg/cm 2 and the amount of steam fed to the furnace falls in the range of 200 to 800 kg per ton of said hydrocarbon.
Claim 12
Dependent Claim
92 words
A composition according to claim 10, wherein said component (B) is an electroconductive carbon black obtained in the operation of the furnace under conditions that the carbon atom/hydrogen atom weight ratio in the liquid hydrocarbon is 12 or more, the temperature in the furnace falls in the range of 1,300° C. to 1,450° C., the pressure in the furnace falls in the range of 25 to 80 kg/cm 2 and the amount of steam fed to the furnace falls in the range of 300 to 800 kg per ton of said hydrocarbon.
Claim 13
Dependent Claim
19 words
A composition according to claim 11, wherein said liquid hydrocarbon is an ethylene heavy end or a carbon oil.
Claim 14
Dependent Claim
25 words
A composition according to claim 1, wherein said component (B) is an electroconductive carbon black having an DBP-absorption number of 240 to 320 ml/100 g.
Claim 15
Dependent Claim
26 words
A composition according to claim 1, wherein said component (B) is an electroconductive carbon black having an impurity metal residue of 0.15% by weight or less.
Claim 16
Dependent Claim
27 words
A composition according to claim 1, which comprises 100 parts by weight of said component (A) and 10 to 20 parts by weight of said component (B).
References Cited (Backward Citations)
US4246142A
Cited
US4246142B1
Cited
DE2723488A1
Cited
US4421678A
Cited
US4493787A
Cited
US4587039A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-09-28 | 1991-03-30 | 1991-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-28 | 1995-03-30 | 1995-09-29 | $3760.00 | Window Closed / Lapsed |
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