Patent ID: 8722600

Claim:
A copolymer comprising free-radically polymerized units of a) from 0.1 to 40% by weight of one or more (meth)acrylates of the formula (I) wherein R is hydrogen or methyl and R 1 is a linear or branched alkyl radical having from 1 to 5 carbon atoms, b) from 35 to 99.99% by weight of one or more ethylenically unsaturated ester compounds of the formula (II) wherein R is hydrogen or methyl, R 4 is a linear, cyclic or branched alkyl radical having from 6 to 40 carbon atoms, R 2 and R 3 are each independently hydrogen or a group of the formula —COOR 5 where R 5 is hydrogen or a linear, cyclic or branched alkyl radical having from 6 to 40 carbon atoms, and c) from 0 to 40% by weight of one or more comonomers, and d) from 0.01 to 20% by weight of a compound selected from the group consisting of omega-olefin carboxylic acids, e) from 0 to 20% by weight of one or more compounds of the formula (IV) wherein R 10 , R 11 and R 12 may each independently be hydrogen or an alkyl group having from 1 to 5 carbon atoms and R 13 is either a C(O)OR 14 group and R 14 is a linear or branched alkyl radical which is substituted by at least one —NR 15 R 16 group and has from 2 to 20, carbon atoms, where R 15 and R 16 are each independently hydrogen, an alkyl radical having from 1 to 20, carbon atoms, and where R 15 and R 16 , including the nitrogen atom and, if present, a further nitrogen or oxygen atom, form a 5-or 6-membered ring which may optionally be substituted by C 1 -C 6 -alkyl, or R 13 is an NR 17 C(═O)R 18 group where R 17 and R 18 together form an alkylene group having from 2 to 6 carbon atoms, where they form a 4-to 8-membered saturated or unsaturated ring, optionally including a further nitrogen or oxygen atom, where this ring may also optionally be substituted by C 1 -C 6 -alkyl, where the compound e) is present only in the backbone of the polymer formed, and, if present, the compound e) of the formula (IV) is present only in the backbone of the polymer formed, and the % by weight of the above components is based on the total weight of the monomers used.