| abstract |
Molding composition of at least one styrene-butadiene block copolymer of the general structure accessible by anionic polymerization (S₁B₁-) m -X - (- S₂B₂) n in the S₁B₁ a block copolymer section from at least one polystyrene block with a molecular weight of 3000 to 230,000 [g / mol] and a polybutadiene block with a molecular weight of 2000 to 30,000 [g / mol] and S₂B₂ a block copolymer section with at least one polystyrene block with a molecular weight of 2000 each having S₁B₁ to 60,000 [g / mol] and a polybutadiene block with a molecular weight of 2,000 to 30,000 [g / mol], the total molar mass of S₁B₁: 50,000 to 250,000 [g / mol] and that of S₂B₂: 5,000 to 75,000 [ g / mol], the block transitions are sharp or smeared and the star number m + n is a total of 3 to 15, with the proviso that m is ≦ n and / or at least one linear styrene-butadiene block copolymer with at least two polystyrene blocks and at least a polybutadiene block of comparable total molar mass and 0.01 to 1% by weight, based on the mass or the block copolymers, of α-tocopherol (vitamin E). |