Epihalohydrin polymer composition
AssigneeRaychem Corporation
InventorsJohn M. Senior, Linda E. Abrams
Life of this patent
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Abstract
A composition based on epihalohydrin elastomers comprises from 12 to 125 parts, preferably from 25 to 75 parts, of a suitable tackifier, and from 25 to 150 parts, preferably from 30 to 100 parts, of a particulate filler per 100 parts by weight of elastomer. The tackifier contains polar moieties for compatibility with the elastomer and is preferably a phenolic, modified phenolic, coumarone-indene or polyketone resin. The filler is preferably an inorganic material such as alumina trihydrate, silica, or iron oxide. These composition have useful adhesive and surprising stress-grading properties and are thus suitable for use with heat-recoverable articles in the terminatiion, connection, and encapsulation of high voltage electrical apparatus.
Claims22
A method of providing relief against electrical stress in a region liable to be affected which comprises filling any voids in said region with a composition comprising:
- (a) 100 parts by weight of an elastomeric epihalohydrin polymer comprising recurring units having the formula:
- ##STR2## where X is a halogen atom;
- (b) from 12 to 125 parts by weight of a tackifier;
- and
- (c) from 25 to 150 parts by weight of a particulate filler.
An electrical apparatus subject to high voltage stress having voids in a region liable to be affected by electrical stress filled with a composition which provides relief against said electrical stress, said composition comprising:
- (a) 100 parts by weight of an elastomeric epihalohydrin polymer comprising recurring units having the formula:
- ##STR3## where X is a halogen atom;
- (b) from 12 to 125 parts by weight of a tackifier;
- and
- (c) from 25 to 150 parts by weight of a particulate filler.
A high voltage cable having voids in a region liable to be affected by electrical stress filled with a composition which provides relief against said electrical stress, said composition comprising:
- (a) 100 parts by weight of an elastomeric epihalohydrin polymer comprising recurring units having the formula:
- ##STR4## where X is a halogen atom;
- (b) from 12 to 125 parts by weight of a tackifier;
- and
- (c) from 25 to 150 parts by weight of a particulate filler.
Dependencies are inferred from the claim text.