<p>The invention relates to compatible polymer blends of polystyrene and polymethacrylate which are formed from the components (A) 0.1 - 99 % by weight of a polystyrene built up to the extent of at least 95 % by weight from styrene (polymer P1) and (B) 99.1 - 0.1 % by weight of a polymethacrylate built up a) to the extent of from more than 90 to 100 % by weight from ethyl methacrylate and b) to the extent of from zero to less than 10 % by weight from at least one ethyl methacrylate-copolymerisable monomer, with the proviso that a) plus b) adds up to 100 % by weight (polymer P2).</p>
