| abstract |
The present invention relates to a copolymer (A) having a glass transition temperature T g of at least -30 ° C, which comprises a mixture of olefinically unsaturated monomers (a) in the presence of at least one initiator in at least one organic solvent (A1) 10 to 60 mol% of at least one monomer of the formula (I), and (a2) 40 to 90 mol% of at least one monomer of the formula H 2 C = CH 2 - (C = O) -OR x, H 2 C = CH (CH 3) - (C = O) -OR x as well as H 2 C = CH 2 -O- ( C = O) - R x (wherein R x is an alkyl group having 1 to 20 carbon atoms), wherein the mole ratio of the monomers (a1) and (a2) to the mole The ratio is at least 90 mol% based on the total molar amount of monomer (a) used and the copolymerization is carried out at a temperature of 60 to 200 DEG C and a pressure of at least 2 bar. (I) In the above formula R 1 = C 1 - to C 4 -alkoxy, R 2 = C 1 - to C 4 -alkyl and m = 0-2. |