THERMOPLASTIC BLOCK COPOLYMERS

摘要

Thermoplastic copolymers wherein said copolymer is selected from the group consisting of block copolymers having the general formulae (I) A-B-A, (II) A-B-A-B-A and (III) xB-¢A-B!n-yA, and graft copolymers having the general formula (IV) ¢?!m, wherein m and n are integers greater than or equal to 2; x and y are 0 or 1, and y is 0 when n is 2; and A and B are mutually incompatible vinyl aromatic polymer blocks selected from the group of poly(alkyl styrene), poly(.alpha.-methyl styrene) and poly(alkyl.alpha.-methyl styrene) having a solubility parameter difference of greater than 0.7.