Patent ID: 7064164

Claim:
A mixture comprising linear block copolymers made from vinylaromatic monomers and from dienes of the structure (I) S 1 -B 1 -S 2 and (II) S 3 -B 2 -S 4 , where S 1 is a block made from vinylaromatic monomers with number-average molar mass M n in the range from 40,000 to 100,000 g/mol, each of S 2 , S 3 and S 4 is a block made from vinylaromatic monomers with number-average molar mass M n in the range from 5,000 to 20,000 g/mol, each B 1 and B 2 is a block made from dienes or a copolymer block made from dienes and from vinylaromatic monomers with number-average molar mass M n in the range from 15,000 to 40,000 g/mol, and the molar ratio of the block copolymers (I)/(II) is in the range from 0.6 to 2.