The invention relates to thermoplastic molding materials containing A) 10 to 99 wt. % of a vinyl aromatic polymer with a syndiotactic pentadene content of 30 mol %, B) 0.1 to 20 % of delaminated stratified silicate (phyllosilicate), C) 0 to 50 wt. % other additives and processing agents, wherein the weight percentages of constituents A) to C) amount to 100 %.
