Patent ID: 7470746

Claim:
A mixture comprising linear block copolymers composed of vinylaromatic monomers and dienes of the structure (I) S 1 -B 1 -S 2 and (II) B 2 -S 3 , where S 1 is a block composed of vinylaromatic monomers whose number-average molar mass M n is in the range from 40 000 to 100 000 g/mol, each of S 2 and S 3 is a block composed of vinylaromatic monomers whose number-average molar mass Mn is in the range from 5000 to 20 000 g/mol, each of B 1 and B 2 is one or more blocks composed of dienes or is copolymer blocks composed of dienes and of vinylaromatic monomers whose number-average molar mass M n is in the range from 15 000 to 100 000 g/mol, and the molar ratio of the block copolymers (I)/(II) is in the range from 0.5 to 10.