Filled thermoplastic compositions based on mixtures of ethylene interpolymers

A composition consisting essentially of

• (a) from about 5 percent to about 60 percent by weight of a mixture of at least two copolymers of ethylene, copolymer (A) and copolymer (B), each copolymer having at least one polar comonomer selected from the group consisting of vinyl esters of saturated carboxylic acids wherein the acid moiety has up to 4 carbon atoms, unsaturated mono- or dicarboxylic acids of 3 to 5 carbon atoms, the salts of said unsaturated acids, and esters of said unsaturated acids wherein the alcohol moiety has 1 to 8 carbon atoms, copolymer (A) having a polar comonomer content of from about 2 to about 30 percent by weight, an ethylene content of from about 70 to about 98 percent by weight and a melt index of from about 0.1 to about 20, and copolymer (B) having a polar conomoner content of from about 28 to about 70 percent by weight, an ethylene content of from about 30 to about 72 percent by weight and a melt index of from about 5 to about 1000, provided that the polar comonomer content of copolymer (B) is at least 12 percent by weight higher than the polar comonomer content of copolymer (A) and the weight ratio of copolymer (A) to copolymer (B) is from about 99/1 to about 55/45;
• (b) from about 40 percent to about 90 percent by weight of filler;
• (c) from 0 percent to about 15 percent by weight of at least one plasticizer selected from the group consisting of processing oils, polyesters, polyethers and polyether esters provided that, when the filler level is above about 75 percent by weight, there is at least about 1 percent by weight of plasticizer present, provided that when the filler level is at least 70 percent by weight said composition exhibits a tensile elongation at least 50% higher than a blend containing a single copolymer of ethylene having the same polar comonomer content and melt index as the mixture of at least two copolymers of ethylene has;
• (d) from 0 to about 27% by weight of elastomeric polymer;
• and
• (e) from 0 to about 48% by weight of olefin polymer selected from the group consisting of low density branched polyethylene, high density linear polyethylene, linear copolymers of ethylene and another olefin comonomer, polypropylene and copolymers of propylene and ethylene where the ethylene content is up to 20% by weight.