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    • 16. 发明授权
    • Absorbent polymers, manufacturing process and their use in particular
for sanitary articles
    • 吸收性聚合物,制造工艺及其特别用于卫生用品的用途
    • US5258448A
    • 1993-11-02
    • US957006
    • 1992-10-06
    • Paul MalloFritz EngelhardtUlrich RiegelRudiger Funk
    • Paul MalloFritz EngelhardtUlrich RiegelRudiger Funk
    • A61F13/53A61L15/18A61L15/60C08F2/32C08F6/06C08F6/24C08F8/00C08F20/04C08F20/06C08F120/04
    • C08F20/06A61L15/18A61L15/60
    • Hydrophobic, cross-linked absorbent polymers, insoluble in water, in the form of microbeads , based on silica and acrylic acid partially salified by an alkali metal, are obtained by a polymerization process in a water-in-oil suspension in which an aqueous phase obtained extemporaneously from (1), an aqueous solution containing one or more hydrosoluble polymerization initiators, which are free radical generators, and (2), an aqueous phase containing at a concentration of 50.+-.15% by weight a mixture of by weight 2 to 25% of colloidal silica and 98 to 75% of acrylic acid of which 60 to 80 is salified by an alkaline metal, is introduced slowly, under agitation, into a totally deoxygenated oil phase maintained at boiling point and containing a protective colloid, with an aqueous phase to oil phase weight ratio of between 0.8 and 1.2, then when the polymerization reaction is finished, 15 to 55% of the water present is eliminated by azeotropic distillation with recycling of the organic solvent, then 0.01 to 0.06% in molar proportions relative to the monomers of ethyleneglycol diglycidyl ether is introduced into the reaction mixture at boiling point and azeotropic distillation of the residual water is continued until a suspension is obtained which has a dry content of 85.+-.10% and finally the desired polymer is isolated by filtration; use as absorbent compound and in a sanitary article.
    • 通过在油包水悬浮液中的聚合方法获得以碱金属部分盐化的基于二氧化硅和丙烯酸的微珠形式的不溶于水的疏水性交联吸收性聚合物,其中水相 从(1)中得到的含有一种或多种作为自由基发生剂的水溶性聚合引发剂的水溶液,和(2)含有浓度为50 +/- 15重量%的混合物的水相, 在搅拌下将2〜25%的胶体二氧化硅和98〜75%的丙烯酸(其中60〜80)用碱金属盐化,缓慢加入到保持在沸点并含有保护胶体的完全脱氧油相中, 水相 - 油相重量比在0.8和1.2之间,然后当聚合反应完成时,通过共沸蒸馏除去存在的15-55%的水,并回收有机溶液 nt,然后相对于乙二醇二缩水甘油醚单体的摩尔比例为0.01至0.06%,在沸点下引入该反应混合物,继续共沸蒸馏残余水直至获得干燥含量为85 + / -10%,最后通过过滤分离所需的聚合物; 用作吸收剂化合物和卫生制品。