| 摘要 |
PCT No. PCT/EP92/02259 Sec. 371 Date Mar. 30, 1994 Sec. 102(e) Date Mar. 30, 1994 PCT Filed Sep. 30, 1992 PCT Pub. No. WO93/07190 PCT Pub. Date Apr. 15, 1993.The present invention relates to an acrylate copolymer containing amino groups, carboxyl groups and, if appropriate, hydroxyl groups which is characterized in that it has been produced by preparing an acrylate copolymer containing amino groups and, if appropriate, carboxyl groups, by means of A) free-radical solution polymerization, using azo initiators at temperatures from 80 DEG to 150 DEG C., of a1) 1 to 20% by weight of vinylimidazole and/or dimethylaminopropylmethacrylamide, a2) 0 to 50% by weight of one or more monomers containing hydroxyl groups, a3) 0 to 50% by weight of one or more monomers containing carboxyl groups, and a4) 30 to 85% by weight of at least one further ethylenically unsaturated copolymerizable monomer, the total of the proportions by weight of the components a1 to a4 always being 100% by weight, and the proportions by weight of the components a2 and a3 not both simultaneously being zero, and B) if appropriate, reacting the acrylate copolymer obtained in stage (A) with carboxylic acid anhydrides, the quantity of carboxylic acid anhydrides employed having been selected such that the resulting copolymer has the desired acid number. |
