Patent ID: 8173740

Claim:
A polymer blend composition, the composition comprising components: a) from 55 percent by weight to 92 percent by weight, based upon composition weight, of a styrenic tetrablock copolymer, the tetrablock copolymer having (1) a molecular structure represented as S-I-B-S, wherein each S is independently a polymer block of predominantly styrene and has an apparent molecular weight within a range of from 10,000 to 15,000, I is a polymer block of predominantly isoprene and B is a polymer block of predominantly butadiene, I and B being present in a weight ratio of I:B that falls within a range of from 75:25 to 15:85, (2) a polymerized styrene content within a range of from 15 percent by weight to 32 percent by weight, based upon tetrablock copolymer weight, and (3) an apparent molecular weight within a range of from 85,000 to 160,000; b) from 8 percent by weight to 45 percent by weight, based upon composition weight, of a thermoplastic resin that differs from component (a); and, optionally, c) from 0 percent by weight to 20 percent by weight, based upon composition weight, of an extender material, amounts of a), b) and c), when taken together, totaling 100 percent by weight.