The present invention is obtained by copolymerization of a mixture of olefinically unsaturated monomers (a) in at least one organic solvent in the presence of at least one initiator, and has a glass transition temperature Tg of at least −30 ° C. A mixture of monomers (a) to be polymerized, wherein (a1) 10 mol% to 60 mol% of the following formula (I): embedded image wherein R 1 = C 1 -C 4 alkoxy At least one monomer of the formula H2C = CH2- (C = O) -O-Rx, H2C = CH, wherein R2 = C1-C4 alkyl and m = 0 to 2. (CH3)-(C = O) -O-Rx and H2C = CH2-O- (C = O) -Rx where Rx is an alkyl radical having from 1 to 20 carbon atoms. ) Comprising 40 mol% to 90 mol% of at least one olefinically unsaturated monomer selected from the group consisting of monomers, of monomers (a1) and (a2) relative to the total molar amount of monomers (a) used The copolymer (A) relates to a copolymer (A) in which the sum of the molar fractions is at least 90 mol% and the copolymerization is carried out at a temperature from 60 ° C. to 200 ° C. and a pressure of at least 2 bar.
展开▼
