A polymer composed overall of

    from 50 to 99.98 % by weight of C.sub.1 -C.sub.12 alkyl (meth)acrylate a),
    from 0.02 to 10 % by weight of a vinylaromatic compound b),
    from 0 to 10    % by weight of an ethylenically unsaturated acid
                    or of an ehtylenically unsaturated acid anhydride c),

and from 0 to 40% by weight of further monomers d), the percentages by weight being based on the polymer and the polymer being obtainable by polymerizing the monomers a) to d) in at least two stages which differ in their content of vinylaromatic compounds in such a way that the content of vinylaromatic compounds in the vinylaromatics-rich stage is at least 5 times as great as in the low-vinylaromatics stage.

Прозодежда составленная полимером от от 50 до 99.98 % by weight of C.sub.1 - алкил C.sub.12 (meth)acrylate a), от от 0.02 до 10 % by weight of vinylaromatic смесь б), от от 0 до 10 % by weight of этеново unsaturated кислота или ehtylenically unsaturated кисловочного ангидрина ч), и от от 0 до 40% by weight of более дополнительные мономеры д), проценты весом будучи основыванным на полимере и полимер достижим путем полимеризовать мономеры a) к д) в по крайней мере 2 этапах которые отличают в их содержании vinylaromatic смесей in such a way that содержание vinylaromatic смесей в винылароматичс-bogatom этапе по крайней мере 5 времен как больших как в nizkom-vinylaromatics этапе.