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    • 8. 发明授权
    • Multi-stage opacifying polymer particles containing non-polymeric acid
absorbed therein
    • 含有非聚合酸的多级不透明聚合物颗粒被吸收
    • US4970241A
    • 1990-11-13
    • US382612
    • 1989-07-19
    • Alexander KowalskiMartin Vogel
    • Alexander KowalskiMartin Vogel
    • C08F285/00C08J9/28C09D7/12
    • C08J9/28C08F285/00C09D7/1291Y10S525/902
    • Multi-stage polymer particles containing one or more void space(s) therein are produced by sequential emulsion polymerization of an essentially low-acid earlier polymer stage, encapsulation of said low-acid polymer stage with at least a final polymer stage, contacting said polymer particles with a non-polymeric carboxylic acid or anhydride to permit the acid or anhydride to be absorbed into said low-acid polymer stage and swelling the polymer particles by contacting the particles with an aqueous base. The low-acid polymer stage is formed by emulsion polymerizing a monomer system comprising ethylenically unsaturated monomer(s) and containing less than 5% by weight of monomer(s) containing acid functionality. The low-acid polymer stage is swubsequently encapsulated by one or more polymer stages by emulsion polymerizing ethylenically unsaturated monomer(s) in the presence of the low-acid polymer stage. The final stage has a glass transition temperature (Tg) of about 50.degree. C. or greater, and the total polymer stages having a Tg of about 50.degree. C. or greater comprise about 60% or more by weight of the polymer particles. A non-polymeric carboxylic acid or anhydride is absorbed into the polymer particles and the resultant particles are contacted with base at a pH sufficient to swell the particles with water at a temperature near or above the Tg of the neat polymer or plasticized polymer of the final polymer stage. When dried the particles contain void space(s) therein which produce(s) opacity in compositions in which the particles are contained.
    • 在其中含有一个或多个空隙空间的多级聚合物颗粒通过基本上低酸的较早聚合物阶段的顺序乳液聚合制备,所述低酸聚合物阶段至少包含最终聚合物阶段,使所述聚合物接触 具有非聚合羧酸或酸酐的颗粒,以允许酸或酸酐被吸收到所述低酸聚合物阶段中,并通过使颗粒与碱水溶液接触来使聚合物颗粒膨胀。 通过乳液聚合包含烯属不饱和单体并且含有少于5重量%的含有酸官能团的单体的单体体系形成低酸聚合物阶段。 低酸聚合物阶段通过在低酸聚合物阶段的存在下通过乳液聚合烯键式不饱和单体而被一个或多个聚合物阶段封装。 最终阶段具有约50℃或更高的玻璃化转变温度(Tg),并且具有约50℃或更高Tg的总聚合物阶段包含约60重量%或更多的聚合物颗粒。 非聚合的羧酸或酸酐被吸收到聚合物颗粒中,并且所得颗粒在足以在最终纯净聚合物或增塑聚合物的Tg附近或更高的温度下用水溶胀颗粒的pH与碱接触 聚合物阶段。 当干燥时,颗粒中含有空隙空间,其中含有颗粒的组合物中产生不透明度。