The invention relates to a redispersible powder obtainable by (co)polymerization, using a polymer with cationic functionality in an aqueous medium, optionally accompanied by the use of conventional additives, the polymer with cationic functionality being obtained by (co)polymerization in an aqueous medium of olefinically unsaturated (co)monomers, wherein at least one (co)monomer has a cationic functionality, further (co)monomers are added and polymerization takes place in the presence of suitable initiators, and by drying the aqueous dispersion obtained, the (co)polymerizate having one or more reactive groups. According to another embodiment, the polymer with cationic functionality is formed in situ in the presence of a seed. According to another embodiment, the process is controlled in such a way that a (co)polymerizate particle with heterogeneous morphology is formed. The invention also relates to the aqueous dispersions, a process for the preparation of the redispersible powder and the use thereof.
本发明涉及一种可再分散粉末,该粉末可通过(共)聚合获得,在
水性介质中使用具有阳离子官能度的聚合物,也可选择使用常规添加剂,具有阳离子官能度的聚合物是通过烯烃不饱和(共)单体在
水性介质中(共)聚合获得的、其中至少一种(共)单体具有阳离子官能团,加入更多的(共)单体,在合适的
引发剂存在下进行聚合,干燥得到的
水分散液,(共)聚合物具有一个或多个活性基团。根据另一个实施方案,具有阳离子官能团的聚合物是在有种子存在的情况下就地形成的。根据另一个实施方案,该工艺的控制方式是形成具有异质形态的(共)聚合体颗粒。本发明还涉及
水性分散体、可再分散粉末的制备工艺及其用途。