Patent ID: 8030409

Claim:
A thermoplastic polymer composition, comprising: (i) 1-20 wt % of a block copolymer comprising first and second blocks, wherein the first block comprises a copolymer of styrene and an unsaturated cyclic anhydride (UCA) and the second block comprises polystyrene, and wherein the block copolymer has no more than about 18 wt % UCA, a polydispersity between about 1.2 and about 3 and a number average molecular weight greater than about 25,000; (ii) 1-98 wt % engineering thermoplastic having functional groups capable of reacting with or compatible with the first block of the block copolymer; and (iii) 1-98 wt % thermoplastic polymer with polymer segments compatible or miscible with the second block of the block copolymer.