Patent ID: 7737216

Claim:
A block copolymer comprising: a monovinylarylene and a conjugated diene coupled block copolymer; a random mixed block of monovinylarylene and conjugated diene, wherein the random mixed block comprises 4-9 times as much monovinylarylene as conjugated diene; wherein a 2 mil film of the block copolymer oriented at 80° C. or less exhibits the following properties: at least 50% shrinkage when immersed for 30 seconds in an oil bath at 80° C.; and a natural shrinkage of no more than 5%; wherein the block copolymer comprises an initially formed block which is a monovinylarylene block that is 15-30 wt % of the block copolymer; and wherein the block copolymer comprises 20-30 wt % conjugated diene.