The present invention relates to novel compositions comprising (a) anionic block copolymers of mono alkenyl arenes and conjugated dienes where one of the blocks is a controlled distribution copolymer of a conjugated diene and mono alkenyl arene having a specific arrangement of the monomers in the copolymer...http://www.google.es/patents/US7585916?utm_source=gb-gplus-sharePatente US7585916 - Block copolymer compositions
