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    • 6. 发明授权
    • Water-redispersible powders of film-forming polymers with a
    • 具有“核/壳”结构的成膜聚合物的水可再分散粉末
    • US5872189A
    • 1999-02-16
    • US860204
    • 1997-09-08
    • Bill BettJoel Richard
    • Bill BettJoel Richard
    • C08F2/24C08F279/02C09D151/04C09J151/04D21H19/58
    • D21H19/58C08F279/02C09D151/04C09J151/04Y10S977/70
    • The present invention relates to a water-redispersible powder based on film-forming polymers which are substantially water-insoluble and which are prepared by aqueous emulsion polymerization of monomers containing ethylenic unsaturation with a "core/shell" structure comprising a hydrophobic core based on a polymer exhibiting a Tg (glass transition temperature) of between -30.degree. and +25.degree. C., preferably between -10.degree. and +20.degree. C., and a hydrophilic shell based on a polymer exhibiting a Tg higher than +55.degree. C., preferably higher than +90.degree. C., characterized in that the shell is bonded to the core by covalent bonds resulting from the reaction of an agent for grafting the shell onto the ethylenic unsaturations remaining in the core, and is substantially insoluble in an alkaline medium.
    • PCT No.PCT / FR95 / 01699 Sec。 371日期:1997年9月8日 102(e)日期1997年9月8日PCT提交1995年12月20日PCT公布。 公开号WO96 / 20963 日本1996年7月11日本发明涉及基于成膜聚合物的水分散性粉末,其基本上不溶于水,并且通过含有含有烯键式不饱和单体的单体的含水乳液聚合制备,所述“核/壳”结构包含 基于显示Tg(玻璃化转变温度)为-30至+25℃,优选-10℃至+ 20℃之间的聚合物的疏水核心和基于显示Tg更高的聚合物的亲水性壳 优选高于+90℃,其特征在于,通过由壳体接枝到残留在核心中的烯属不饱和基团的反应产生的共价键将壳结合到核心,以及 基本上不溶于碱性介质。