Patent ID: 6998443

Claim:
A crosslinkable flame retardant insulation composition having improved abrasion resistance comprising: (a) 15 to 55 weight percent, based on the weight of the composition, copolymer of ethylene and 1 to 20 weight percent ethylenically unsaturated silane having 2 or 3 altoxy substituents; (b) 15 to 55 weight percent, based on the weight of the composition, high density polyethylene resin, said resin being a copolymer of ethylene with a comonomer selected from the group consisting of propylene, butene-1, hexene-1 and octene-1 and having a density of 0.941 to 0.96 g/cm 3 and melt index of 0.1 to 20 g/10 min; (c) 5 to 40 weight percent, based on the weight of the composition, brominated aromatic compound of the formula where x is 3 to 6; m is zero or 1; y is zero or 1; z is 3 to 5 and Y is oxygen or a bivalent aliphatic radical of the formula (C n H 2n ) where n is 1 to 6; (d) 2.5 to 15 weight percent, based on the weight of the composition, stabilizer consisting of a mixture of a zinc mercaptobenzimidazole of the formula where R′ is a C 1-4 alkyl group and n′ is 0 to 4 and an aromatic secondary amine of the formula where R 1 is an aryl group of the formula wherein R* is alkylene, alkylidene, —O—, —NH— or —SO 2 — and R** is hydrogen or C 1-4 alkyl, and R 2 is hydrogen, alkyl, aryl, alkaryl, aralkyl or R 1 , the weight ratio of said zinc mercaptobenzimidazole to said aromatic secondary amine ranging from 0.2:1 to 20:1; and (e) 0.01 to 1 weight percent, based on the weight of the composition, of a silanol condensation catalyst selected from the group consisting of organic bases, carboxylic acids and organometallic compounds.