| abstract |
The invention relates to copolymers of formula (I) wherein R 1 is hydrogen, a C 1 -C 5 -alkyl radical or C 2 -C 5 -alkenyl radical which can also contain heteroatoms, an acid group or an aliphatic or aromatic group comprising 1-50 carbon atoms, including an acid group, R 2 and R 3 independently represent hydrogen, methyl and/or ethyl, n ranges from 0-100, and m ranges from 3 to 30, and k ranges from 1-200, and A is hydrogen, an acid group, a C 1 -C 5 -alkyl radical or a C 2 -C 8 -alkenyl radical which can also contain heteroatoms, an aliphatic or aromatic group comprising 1-50 carbon atoms, including an acid group, or a copolymer unit of formula (II), wherein R 4 is hydrogen, a C 1 -C 5 -alkyl radical or a C 2 -C 5 -alkenyl radical which can also contain heteroatoms, an acid group or an aliphatic or aromatic group comprising 1-50 carbon atoms, including an acid group, R 5 is hydrogen, methyl and/or ethyl, x ranges from 0 to 100, and y ranges from 3-30, wherein, if A is formula (2), R 1 represents hydrogen or an acid group. |