The present invention relates to a method of producing aqueous secondary dispersions of water-insoluble copolymers by free-radical solution polymerization of ethylenically unsaturated monomers M comprising: i) at least one hydrophobic, monoethylenically unsaturated monomer M1 with a solubility in water of not more than 30 g/l at 25° C. and 1 bar and ii) at least one hydrophilic, monoethylenically unsaturated, nonionic comonomer M2 with a solubility in water of at least 80 g/l at 25° C. and 1 bar, in an organic, water-miscible solvent or a mixture of water with an organic, water-miscible solvent as polymerization medium and subsequent replacement of the organic solvent by water in which, toward the end of the polymerization, some of the monomers M are added in the form of a monomer composition M′ which comprises essentially only monomers M2 as monomers. The present invention also relates to the aqueous polymer dispersions obtainable by the method according to the invention and to their use, particularly in pharmacy and cosmetics.
本发明涉及一种通过
乙烯基不饱和单体 M 的自由基溶液聚合生产
水不溶性共聚物
水性二次分散体的方法,该方法包括: i) 至少一种疏
水性单
乙烯基不饱和单体 M1,其在
水中的溶解度在 25° C 和 1 bar 时不超过 30 g/l; ii) 至少一种亲
水性单
乙烯基不饱和非离子共聚单体 M2,其在
水中的溶解度在 25° C 和 1 bar 时不超过 80 g/l。ii) 至少一种亲
水性、单
乙烯不饱和、非离子型单体 M2,其在
水中的溶解度至少为 80 克/升(25°C 和 1 巴)。在有机
水溶性溶剂或
水与有机
水溶性溶剂的混合物中作为聚合介质,然后用
水取代有机溶剂,在聚合快结束时,以单体组合物 M′的形式加入部分单体 M,该单体组合物基本上只包括单体 M2。本发明还涉及通过本发明方法获得的含
水聚合物分散体及其用途,特别是在制药和化妆品中的用途。