Patent ID: 7012118

Claim:
A photopolymerizable composition, which comprises: a. a block copolymer component comprising a non-hydrogenated styrene/diene block copolymer and a hydrogenated, controlled-distribution block copolymer, wherein said hydrogenated, controlled-distribution block copolymer has at least one polymer block A and at least one polymer block B, and wherein: i) prior to hydrogenation each A block is a mono alkenyl arene homopolymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono alkenyl arene; ii) subsequent to hydrogenation about 0–10% of the arene double bonds have been reduced, and at least about 90% of the conjugated diene double bonds have been reduced; iii) each A block having a number average molecular weight between about 3,000 and about 60,000 and each B block having a number average molecular weight between about 20,000 and about 300,000; iv) each B block comprises terminal regions adjacent to the A blocks 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; v) the total amount of mono alkenyl arene in the hydrogenated block copolymer is about 20 percent weight to about 80 percent weight; and vi) the weight percent of mono alkenyl arene in each B block is between about 10 percent and about 75 percent; vii) the B block has a monoalkenyl arene blockiness index of less than about 40%; b one or more photopolymerizable ethylenically unsaturated low molecular weight compounds, c one or more polymerization initiators, and optionally d from 0 to 40% by weight, based on the total photopolymerizable composition, of one or more auxiliaries.