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    • 3. 发明授权
    • Water absorbing agent
    • 吸水剂
    • US4734478A
    • 1988-03-29
    • US748820
    • 1985-06-26
    • Tsuneo TsubakimotoTadao ShimomuraYoshio IrieYoshihiko MasudaKazumasa KimuraTakumi Hatsuda
    • Tsuneo TsubakimotoTadao ShimomuraYoshio IrieYoshihiko MasudaKazumasa KimuraTakumi Hatsuda
    • A61L15/18A61L15/60B01J20/26C08F8/14C08J3/12C08J3/24D21H17/28D21H17/43
    • C08J3/12A61L15/18A61L15/60B01J20/26C08F8/14D21H17/28D21H17/43C08F2810/20C08J2300/14
    • The invention provides [I] a water-absorbing agent composed of a water-absorbing resin powder having the molecular chains near its surface being crosslinked, said powder being obtained by mixing 100 parts by weight of a powder of a carboxyl-containing water-absorbing resin selected from the group consisting of a hydrolyzate of a starch-acrylonitrile graft polymer, a partially neutralized product of a starch-acrylic acid graft polymer, a saponification product of a vinyl acetate-acrylic ester copolymer, a hydrolyzate of an acrylonitrile copolymer, a crosslinked product of a hydrolyzate of an acrylonitrile copolymer, a hydrolyzate of an acrylamide copolymer, a crosslinked product of a hydrolyzate of an acrylamide copolymer, a partially neutralized product of polyacrylic acid, and a crosslinked product of partially neutralized polyacrylic acid with 0.001 to 10 parts by weight of a polyhydric alcohol, 0.01 to 8 parts by weight of a hydrophilic organic solvent and 0 to 8 parts by weight of water, and heating the mixture at a temperature of at least 90.degree. C. to react the water-absorbing resin powder with the polyhydric alcohol; [II] a water-absorbing agent composed of a mixture of the water-absorbing agent [I] with finely divided silica; [III] a water-absorbing agent obtained by pulverizing and granulating a mixture of the water-absorbing agent [I] with an aqueous liquid; and [IV] a water-absorbing agent composed of a mixture of the water-absorbing agent [III] with finely divided silica.
    • 本发明提供[I]一种由其表面附近的分子链交联的吸水性树脂粉末组成的吸水剂,所述粉末是通过将100重量份的含羧基的吸水性粉末 选自淀粉 - 丙烯腈接枝聚合物的水解产物,淀粉 - 丙烯酸接枝聚合物的部分中和产物,乙酸乙烯酯 - 丙烯酸酯共聚物的皂化产物,丙烯腈共聚物的水解产物, 丙烯腈共聚物的水解产物,丙烯酰胺共聚物的水解产物,丙烯酰胺共聚物的水解产物的交联产物,聚丙烯酸的部分中和产物和部分中和的聚丙烯酸的交联产物与0.001至10份的交联产物 的多元醇,0.01〜8重量份的亲水性有机溶剂和0〜8重量份的 水,并在至少90℃的温度下加热混合物以使吸水性树脂粉末与多元醇反应; [II]由吸水剂[I]与细碎二氧化硅的混合物组成的吸水剂; [III]通过将吸水剂[I]与水性液体的混合物粉碎和造粒得到的吸水剂; 和[IV]由吸水剂[III]与细碎二氧化硅的混合物组成的吸水剂。