Aqueous self-crosslinking copolymer dispersions ABC obtainable by free-radically initiated copolymerization in the first stage of a monomer mixture A comprising olefinically unsaturated monomers A1 having carbonyl groups, unsaturated carboxylic acids or monoesters of unsaturated dicarboxylic acids A2, monomers A3 selected from vinylaromatic compounds, n-butyl methacrylate and also alkyl esters of unsaturated carboxylic acids or dialkyl esters of unsaturated dicarboxylic acids, esters A4 selected from alkyl esters of unsaturated carboxylic acids of dialkyl esters of unsaturated dicarboxylic acids, and other free-radically polymerizable monomers A5, and subsequent addition of a second monomer mixture B and further polymerization in the second stage, the mixture B comprising olefinically unsaturated monomers B1 corresponding to A1, esters B2 corresponding to A4, and monomers B3 corresponding to A5, and subsequently adding compounds C having hydrazine or hydrazide groups.
水性自交联共聚物分散体 ABC 可通过第一阶段自由基引发的单体混合物 A 的共聚合获得,该单体混合物包括具有羰基的烯烃不饱和单体 A1、不饱和
羧酸或不饱和二
羧酸的单酯 A2、选自
乙烯基芳香族化合物、
甲基丙烯酸正丁酯以及不饱和
羧酸的烷基酯或不饱和二
羧酸的二烷基酯的单体 A3、选自不饱和
羧酸的烷基酯或不饱和二
羧酸的二烷基酯的酯 A4 和其他可自由基聚合的单体 A5、选自不饱和
羧酸的烷基酯或不饱和二
羧酸的二烷基酯的酯 A4,以及其他可自由基聚合的单体 A5,然后加入第二单体混合物 B 并在第二阶段进一步聚合,混合物 B 包括对应于 A1 的烯烃不饱和单体 B1、对应于 A4 的酯 B2 和对应于 A5 的单体 B3,然后加入具有
肼或
肼基团的化合物 C。