Polymer blend composition comprising two block polymers a vinyl aromatic copolymer and a polyester

Claim 1

A thermoplastic molding composition comprising: (a) from about 10 to about 85 percent by weight of a selectively hydrogenated block copolymer comprising at least two monoalkenyl arene polymer end blocks A and at least one substantially completely hydrogenated conjugated diene polymer mid block B, the weight percent of blocks A comprising between 8 and 65 percent by weight of said block copolymers wherein at least 80% of the aliphatic double bonds in block B are hydrogenated and no more than about 25% of the alkenyl aromatic double bonds in block A are hydrogenated; (b) from about 10 to about 80 percent by weight of a vinyl aromatic copolymer comprising a vinyl aromatic compound and an α, β-unsaturated cyclic anhydride; and (c) from about 10 to about 80 percent by weight of a thermoplastic polyester having a molecular weight in excess of about 20,000, a melting point over about 120° C., and which polyester is selected from the he group consisting of a condensation product of a dicarboxylic acid and a glycol, polypivalolactone and polycaprolactone; (d) from about 1 to about 50 percent by weight of a hydrogenated diblock copolymer comprising a monoalkenyl arene polymer and a hydrogenated conjugated diene polymer.