Abstract: Process for the production of asymmetric, star-branched block copolymers which comprise, incorporated into the polymer, from 60 to 95% by weight of vinylaromatic and from 40 to 5% by weight of a conjugated diene having from 4 to 5 C atoms, based on the branched block copolymer, via sequential anionic polymerization and subsequent coupling of the resultant living block-copolymer anions by a coupling agent, and also vinylaromatic-diene block copolymers obtainable via the process and use of these for moldings and for thermoforming foils.

Abstract: Process for the production of asymmetric, star-branched block copolymers which comprise, incorporated into the polymer, from 60 to 95% by weight of vinylaromatic and from 40 to 5% by weight of a conjugated diene having from 4 to 5 C atoms, based on the branched block copolymer, via sequential anionic polymerization and subsequent coupling of the resultant living block-copolymer anions by a coupling agent, and also vinylaromatic-diene block copolymers obtainable via the process and use of these for moldings and for thermoforming foils.

Abstract: Process for the production of vinylaromatic homo- or block copolymers via anionic polymerization, where the polymerization of a vinylaromatic uses a modified n-alkyllithium initiator which is obtainable via reaction, at a temperature of from ?20 to 100° C., of n-alkyllithium, dissolved in an inert solvent, with a diene in a molar ratio of from 1:1 to 1:50.

Abstract: The invention relates to thermoplastic moulded masses containing, a) at least one block copolymer (A), comprising, with relation to (A), a1) 50 to 90 wt. % of at least one styrol monomer, a2) 10 to 50 wt. % of at least one diene monomer, with the following as stabilisers, relative to the moulded mass, b) 0.001 to 0.18 wt. % of at least one benzofuranone derivative (B), c) 0.05 to 1 wt. % of at least one organic phosphite (C), and d) 0.1 to 0.3 wt. % of at least one stabiliser compound (D), selected from sterically hindered phenols and aromatic amines.

Abstract: The invention relates to anionically polymerized impact polystyrene which is characterized in that it has a melt volume flow rate MVR of at least 8 cm3/10 min which is measured in accordance with EN ISO 1133 at a test temperature of 200°C. and with a nominal load of 5 kg.