Materials having non-linear electrical resistance characteristics
AssigneeRaychem Corporation
InventorsPaul Taylor, Richard J. Penneck
Life of this patent
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Abstract
A polymer composition containing silicon carbide of a critical maximum average particle size can be processed into heat-shrinkable articles possessing nonlinear electrical resistance characteristics. An embodiment of the invention provides a heat-shrinkable article comprising a laminate of a layer of elastomer, including silicon carbide particles, and a layer of a heat-shrinkable polymeric material. The elastomeric layer may be a blend of a rubbery polymer and a low density polyethylene having dispersed therein particulate silicon carbide of particle size finer than about 300 grit.
Claims25
A composition of matter having nonlinear electrical resistance characteristics comprising a blend of:
- (a) an ethylene-propylene rubber copolymer wherein the ethylene content is at least about 65%;
- (b) a copolymer of ethylene and a monomer, other than propylene, copolymerisable therewith;
- and
- (c) a low density polyethylene having dispersed therein particulate silicon carbide, of particle size finer than about 300 grit.
A composition of matter having non-linear electrical resistance characteristics comprising the blend of:
- a butadiene/acrylonitrile rubber containing from about 10% to about 40% by weight acrylonitrile;
- and
- a low density polyethylene having dispersed therein particulate silicon carbide, of particle size finer than about 300 grit.
A composition of matter having nonlinear electrical resistance characteristics comprising a blend of:
- a. a butadiene/acrytronitrile rubber containing from about 10 percent to about 40 percent by weight acrytronitrile;
- b. a copolymer of ethylene and a monomer other than propylene copolymerisable therewith;
- and
- c. A low density polyethylene having dispersed therein particulate silicon carbide of particle size finer than about 300 grit.
Dependencies are inferred from the claim text.