Patent ID: 7244785

Claim:
A block copolymer having at least one A block, at least one B block and at least one C block, wherein: a. each A block is a mono alkenyl arene polymer block, each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono alkacenyl arene, and each C block is a polymer block of one or more conjugated dienes; b. each A block having a number average molecular weight between about 3,000 and about 60,000, each B block having a number average molecular weight between about 30,000 and about 300,000, and each C block having a number average molecular weight between about 2,000 and about 200,000; c. each B block comprises terminal regions adjacent to the A block that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono alkenyl arene units; d. the total amount of mono alkenyl arene in the block copolymer is about 20 percent weight to about 80 percent weight; e. the weight percent of mono alkenyl arene in each B block is between about 10 and about 75 percent; and f. the styrene blockiness index of the B block is less than about 40 percent.