| abstract |
Mixtures containing linear, block copolymers, which are constituted by vinyl aromatic monomers and by dienes of the structure S1-B1-S2 (I) and S3-B2-S4, (II) meaning S1 a block consisting of vinyl aromatic monomers with a molecular weight average in number Mn located in the range between 40,000 and 70,000 g / mol, meaning S2, S3 and S4 respectively blocks consisting of vinyl aromatic monomers with an average molecular weight in number Mn located in the range between 5,000 and 20,000 g / mol, meaning B1 and B2 respectively blocks consisting of dienes or copolymer blocks consisting of dienes and vinyl aromatic monomers with an average molecular weight in numberMn located in the range between 15,000 and 40,000 g / mol, and the ratio between the block copolymers being located ( I) / (II) in the interval between 0.6 and 2. |