Thermoplastic molding compound

A thermoplastic molding, composition of

• A) from 10 to 100% by weight of a copolymer consisting essentially of the monomers of the general formulae I and II ##STR3## where R.sub.1 is H or alkyl of 1-22 carbon atoms,
• R.sub.2 is H or alkyl of 1-22 carbon atoms,
• R.sub.3 is H or alkyl of 1-4 carbon atoms,
• a is 0, 1, 2, 3, 4 or 5, and
• b is 0, 1, 2, 3, 4 or 5
• as obtained by providing the monomers of the formula (I) as initial charge and metering in the monomers of the formula II during the reaction according to a gradient method such that, as the reaction progresses, the amount of monomer (II) added per unit time is essentially reduced according to the amount of monomer (I) still present;
• B) from 0 to 3000 ppm, based on the weight of component a, of compounds of the general formula I;
• C) from 0 to 500 ppm, based on the weight of component A, of compounds of the general formula II;
• D) from 0 to 90% by weight, based on the total weight of the molding compound, of polymers other than A);
• and
• E) from 0 to 50% by weight, based on the total weight of the molding compound, of additives and processing aids.