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US 5,180,889 AGranted
Crush resistant cable insulation
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsCharles E. Rogers, Gertraud A. Schmidt
Life of this patent
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Abstract
A composition useful in the manufacture or cable comprising: (i) a copolymer comprising ethylene and one or more alpha-olefins having a density equal to or less than 0.915 gram per cubic centimeter; (ii) a metal hydrate flame retardant compound; (iii) a styrene-ethylene-butylene-styrene triblock copolymer; and (iv) optionally, an impact polypropylene copolymer or polypropylene.
Claims6
A cable construction having a flatwise crush resistance of at least 600 pounds and an edgewise crush resistance of at least 1200 pounds comprising:
- (a) an assembly of three parallel electrical conductors, two of the conductors being coated with the following non-crosslinked composition:
- (i) a copolymer comprising ethylene and one or more alpha-olefins having 3 to 8 carbon atoms, said copolymer having a density in the range of 0.870 to 0.915 gram per cubic centimeter and, based upon 100 parts by weight of component (i):
- (ii) a surface treated metal hydrate flame retardant compound in an amount of about 200 to about 400 parts by weight;
- (iii) a styrene-ethylene-butylene-styrene triblock copolymer in an amount of about 25 to about 100 parts by weight;
- (iv) an impact polypropylene copolymer in an amount of about 25 to about 100 parts by weight;
- and
- (v) an organosilane coupling agent in an amount of about 0.5 to about 5 parts by weight;
- (b) one or more layers of paper surrounding component (a);
- (c) one or more layers of paper inside of component (b) and surrounding the conductor, which is not coated;
- and
- (d) a layer of said non-crosslinked composition surrounding component (b).
8 more elements
Dependencies are inferred from the claim text.