The production of aqueous dispersions of cationic homo- and copolymers using amphoteric protective colloids
申请人:BASF AKTIENGESELLSCHAFT
公开号:EP1396508A1
公开(公告)日:2004-03-10
A process for the production of water-soluble or water-swellable cationic polymers by
(i) free-radically initiated copolymerization of monomer mixtures in water comprising
(a) from 1 to 99% by weight of a cationic monomer or quaternizable monomer,
(b) from 1 to 99% by weight of a water-soluble monomer,
(c) from 0 to 10% by weight of a bi- or polyfunctional, free-radically copolymerizable monomer, adjusting the amounts (a) to (c) in such a way that the resulting polymer has an overall positive charge,
in the presence of 1 to 100% of the amount of a salt which is necessary to saturate the reaction medium with said salt and
in the presence of 0,1 to 20 % by weight referred to the weight of the dispersion, of an amphoteric dispersant having an overall negative charge, and
(ii) subsequent quaternization of the polymer if the monomer (a) employed is a non-quaternized monomer is disclosed.
通过以下方法生产水溶性或水溶性阳离子聚合物的工艺
(i) 单体混合物在水中的自由基引发共聚,包括
(a) 1%至 99%(按重量计)的阳离子单体或可季铵化单体、
(b) 1%至 99%(按重量计)的水溶性单体、
(c) 0 至 10%(按重量计)的双官能团或多官能团、可自由基共聚的单体,(a)至(c)的用量应调整到所制得的聚合物总体带正电荷、
在 1 至 100%的盐量存在下,该盐量是使反应介质达到饱和所必需的,以及
按分散液重量计,加入 0.1%至 20%的两性分散剂,使其带有负电荷,以及
(ii) 如果所使用的单体 (a) 是非季铵化单体,则随后对聚合物进行季铵化。