Patent US2283916A successfully refreshed from Google Patents.
EP0035271B1
Expired / Lapsed
EP
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Elastomeric composition for providing electrical stress control
Assignee: 3M Co
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Filing: 1981-03-03
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Granted: 1985-05-08
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Expires: 2001-03-03
Abstract
No abstract record available.
Inventors
- 👤 Paul Nick Nelson
- 👤 Dieter Kehr
- 👤 Manfred Viebranz
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 10:14
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01B1/24; H02; H02G; H02G15/00; H02G15/02; H02G15/06; H02G15/064; H02G15/068; H02G15/08; H02G15/10; H02G15/103; H02G15/105
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
67 words
An elastomeric composition providing electrical stress control and comprising a compounded non-polar elastomer, carbon black, from 0.8 to 7.0 volume per cent of platelet-shaped conductive particles, said composition being characterized in that it contains from 2.5 to 25 volume per cent carbon black, from 0 to 8.0 volume per cent of high-permittivity inorganic filler and from 0 to 12.0 volume per cent of platelet-shaped inorganic dielectric filler.
Claim 2
Dependent Claim
67 words
An elastomeric composition providing electrical stress control and comprising a compounded non-polar elastomer, carbon black, from 0.8 to 7.0 volume per cent of platelet-shaped conductive particles, said composition being characterized in that it contains from 2.5 to 25 volume per cent carbon black, from 0 to 8.0 volume per cent of high-permittivity inorganic filler and from 0 to 12.0 volume per cent of platelet-shaped inorganic dielectric filler.
Claim 3
Dependent Claim
21 words
The elastomeric composition of claim 1 wherein said carbon black comprises from about 10 to about 20 volume per cent thereof.
Claim 4
Dependent Claim
28 words
The elastomeric composition of claim 1 wherein said carbon black is a coarse furnace grade having an average particle diameter of from about 40 to about 100 nanometers.
Claim 5
Dependent Claim
19 words
The elastomeric composition of claim 1 wherein said dielectric filler comprises less than about 5 volume per cent thereof.
Claim 6
Dependent Claim
12 words
The elastomeric composition of claim 1 wherein said dielectric filler is mica.
Claim 7
Dependent Claim
34 words
The elastomeric composition of claim 5 wherein said mica has an average particle diameter of from about 8 to about 40 micrometers and a particle thickness of from about 0.5 to about 1.0 micrometer.
Claim 8
Dependent Claim
31 words
The elastomeric composition of claim 1 wherein said compounded elastomer is selected from the group consisting of ethylene-propylene-diene copolymers, ethylene-propylene copolymers, styrene-butadiene rubber, polybutadiene rubber, silicones and natural or synthetic polyisoprenes.
Claim 9
Dependent Claim
12 words
The elastomeric composition of claim 1 wherein said conductive particles are aluminum.
Claim 10
Dependent Claim
19 words
The elastomeric composition of claim 8 wherein said aluminum particles have an average particle diameter of about 25 micrometers.
Claim 11
Dependent Claim
28 words
An elastomeric tubular article for use in the splicing and termination of electric power cables, said article comprising a composition according to any of claims 1 to 9.
Claim 12
Dependent Claim
49 words
An elastomeric tubular article according to claim 10 supported in a stretched condition on an easily removable core and containig from about 0.8 to about 3.0 volume per cent of platelet-shaped conductive particles, characterized in that said compounded elastomer is a compounded ethylene-propylene-diene copolymer or a compounded ethylene-propylene copolymer.
Claim 13
Dependent Claim
27 words
The article of claim 11 wherein said carbon black is a course furnace grade having an average particle diameter of from about 40 to about 100 nanometers.
Claim 14
Dependent Claim
20 words
The article of claim 12 wherein said carbon black comprises from about 10 to about 20 volume per cent thereof.
Claim 15
Dependent Claim
18 words
The article of claim 11 wherein said dielectric filler comprises less than about 5 volume per cent thereof.
Claim 16
Dependent Claim
11 words
The article of claim 11 wherein said dielectric filler is mica.
Claim 17
Dependent Claim
33 words
The article of claim 15 wherein said mica has an average particle diameter of from about 8 to about 40 micrometers and a particle thickness of from about 0.5 to about 1.0 micrometer.
Claim 18
Dependent Claim
11 words
The article of claim 11 wherein said conductive particles are aluminum.
Claim 19
Dependent Claim
17 words
The article of claim 17 wherein said aluminum particles have an average diameter of about 25 micrometers.
Claim 20
Dependent Claim
20 words
The article of claim 11 wherein conductive particles are present at from about 1.2 to about 1.8 volume percent thereof.
Claim 21
Dependent Claim
23 words
The article of claim 11 wherein said core is a one-piece rigid spiral core having interconnected adjacent coils in a closed helix configuration.
References Cited (Backward Citations)
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