Disclosed are carboxylic acid containing polymeric microgel particles which are prepared by polymerising in aqueous emulsion a monomer mixture containing about 10-50% by weight of polymerisable carboxylic acid monomers, up to 5% of a difunctional cross-linking monomer and one or more carboxyl-free relatively water-insoluble polymerisable vinyl monomers. The resulting microgel particles are water-swellable and may be employed as stabilisers for use in the preparation of aqueous dispersions of film-forming resins containing smaller amounts of organic solvents than conventional aqueous dispersions of this type. Such dispersions are useful as coating compositions, yielding coatings having less water-sensitivity and improved adhesion as compared with coatings obtained from conventional aqueous dispersions of film-forming resins.
本发明公开了一种含
羧酸的聚合物微凝胶粒子,其制备方法是在
水乳液中聚合一种单体混合物,该单体混合物含有约 10-50%(重量百分比)的可聚合
羧酸单体、最多 5%的双官能团交联单体以及一种或多种不含羧基且相对不溶于
水的可聚合
乙烯基单体。 所得到的微凝胶粒子具有
水膨胀性,可用作稳定剂,用于制备成膜
树脂的
水性分散体,与传统的此类
水性分散体相比,其有机溶剂用量更少。 此类分散体可用作涂料组合物,与传统的成膜
树脂水性分散体相比,所得到的涂料具有更低的
水敏感性和更好的附着力。