Thermoplastic elastomer blends

Claim 1

A thermoplastic composition comprising about 20-99 parts by weight total polymers of a thermoplastic multi-block copolyester elastomer melting above 100° C. consisting essentially of (A) repeating high melting point blocks comprising repeating short chain ester units having the formula ##STR6## wherein D is a divalent radical remaining after removal of hydroxyl groups from a low molecular weight diol having a molecular weight not greater than 250 and R is a divalent radical remaining after the removal of carboxyl groups from a dicarboxylic acid having a molecular weight not greater than 300, D and R being selected so that a polymer which consists essentially of short chain ester units having a number average molecular weight of at least 5000 has melting points above 100° C., (B) repeating low melting point blocks which are derived from compounds containing hydroxyl or carboxyl groups or mixtures thereof having number average molecular weights of 400-4000 and melting points not greater than 100° C., and (C) an amount of difunctional radicals sufficient to join repeating blocks of (A) and (B) to form multi-block copolymer elastomers, the weight ratio of (A) to (B) being from about 1:4 to 1:0.1, and from 1-80 parts by weight total polymers of a polyacrylate elastomer consisting essentially of repeating units of the structures selected from ##STR7## where n is 2 or 4 and m is 1 or 2 and up to 5 weight percent, based on polyacrylate elastomer, of a cure-site monomer.