Blends of thermoplastic elastomers based on styrene (s-tpe) and polyolefins

Polymer blend comprising components A, B and C:

• A:
• 1 to 19.5% by weight of an elastomeric block copolymer A made from at least one block S which forms a hard phase and incorporates units of a vinylaromatic monomer, and at least one elastomeric block B/S which forms a soft phase and incorporates both units of a vinylaromatic monomer (S) and of a diene (B), where S is the vinylaromatic block and B/S is the soft phase, wherein the block is built up randomly from diene units and vinylaromatic units, and where the glass transition temperature Tg of the block S is above 25° C., and that of the block B/S is below 25° C., and the phase volume ratio of block S to block B/S is selected so that the proportion of hard phase in the entire block copolymer is from 1 to 40% by volume and the proportion of the diene is less than 50% by weight, based on A;
• B:
• 0.5 to 8% by weight of component B comprising components B1 and further optional components B2 and/or B3:
• B1:
• at least one elastomeric block copolymer selected from the group consisting of B11, B12 and B13:
• B11:
• block copolymer B11 made from at least one block S which forms a hard phase and incorporates units of a vinylaromatic monomer, and at least one elastomeric block EB which forms a soft phase and incorporates units of ethylene and butylene;
• and/or
• B12:
• block copolymer B12 made from at least one block S which forms a hard phase and incorporates units of a vinylaromatic monomer, and at least one elastomeric block EP which forms a soft phase and incorporates units of ethylene and propylene;
• and/or
• B13:
• block copolymer B13 made from at least one block S which forms a hard phase and incorporates units of a vinylaromatic monomer, and at least one elastomeric block B which forms a soft phase and incorporates units of a diene (B), and the proportion of the hard phase in the entire block copolymer is at most 45% by weight, based on B13;
• B2:
• a stiff/tough block copolymer B2 made from at least one block S which forms a hard phase and incorporates units of a vinylaromatic monomer, and at least one elastomeric block B which forms a soft phase and incorporates units of a diene (B), and the proportion of the hard phase in the entire block copolymer is more than 50% by weight, based on B2;
• B3:
• an ethylene-(C3-C18)-α-olefin copolymer B3 with a high content of (C3-C18)-α-olefin, based on B3, and having a crystallinity of less than 50%;
• C:
• 80 to 98.5% by weight of at least one semi-crystalline olefin homo- or copolymer C different from component B3;
• where the entire weight of components A, B and C give exactly 100% by weight.