| abstract |
A block copolymer with weight-average molar mass M w of at least 100 000 g/mol, comprising n a) at least one block S composed of from 95 to 100% by weight of vinylaromatic monomers and from 0 to 5% by weight of dienes, and n b) at least one copolymer block (S/B) A composed of from 63 to 80% by weight of vinylaromatic monomers and from 20 to 37% by weight of dienes, with glass transition temperature Tg A in the range from 5 to 30° C., and n c) at least one copolymer block (S/B) B composed of from 20 to 60% by weight of vinylaromatic monomers and from 40 to 80% by weight of dienes, with glass transition temperature Tg B in the range from 0 to −80° C., n where the proportion by weight of the entirety of all of the blocks S is in the range from 50 to 70% by weight, and the proportion by weight of the entirety of all of the blocks (S/B) A and (S/B) B is in the range from 30 to 50% by weight, based in each case on the block copolymer A, and also mixtures thereof, and their use. |