Patent ID: 8501880

Claim:
A polymer obtained by free-radical polymerization of one or more macromonomers and optionally one or more further free-radically polymerizable comonomers, wherein the macromonomer(s) is/are obtained by reacting at least one hydroxyoxetane of the formula (I) in which R 1 is alkyl, alkoxy, alkoxyalkyl, hydroxyalkyl, hydroxyalkoxy, hydroxyalkoxyalkyl, aryl, aryloxy, hydroxyaryl or hydroxyaryloxy, R 2 is hydroxyalkyl, hydroxyalkoxy, hydroxyalkoxyalkyl, hydroxyaryl or hydroxyaryloxy, and R 3 is in each case independently hydrogen, alkyl, alkoxy, alkoxyalkyl, aryloxyalkyl, hydroxyalkyl, hydroxyalkoxy, hydroxyalkoxyalkyl, aryl, aryloxy, hydroxyaryl or hydroxyaryloxy, with a starter molecule U-L-X—H in which U=an unethylenically unsaturated, free-radically polymerizable head group, L=divalent organic radical without free-radically polymerizable groups, and X—H=group which cannot be polymerized free-radically and has an active hydrogen atom H, in a molar ratio (hydroxyoxetane(s) of the formula (I): starter molecule) of (100:1) to (1:1) in the presence of at least one suitable catalyst in a cationic ring-opening polymerization.