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    • 1. 发明申请
    • PROCESS FOR PRODUCING BOTH OF ULTRAVIOLET-ABSORBENT SELF-DISPERSIBLE WATER-BASE VINYL RESIN AND FINE RESIN PARTICLE
    • 生产超紫外线自分散型水性乙烯基树脂和细小树脂颗粒的方法
    • WO1992020721A1
    • 1992-11-26
    • PCT/JP1992000663
    • 1992-05-22
    • KAO CORPORATIONMINAMI, TakahideNOUMI, YokoNAKAMURA, Koichi
    • KAO CORPORATION
    • C08F212/14
    • A61Q17/04A61K8/8117A61K8/8152A61K8/8158C08F246/00
    • A process for producing an emulsion of an ultraviolet-absorbent water-base vinyl resin or a fine particle thereof, which can be blended with a cosmetic base, etc., at high concentration, is highly safe and can exhibit sufficiently the effect as an ultraviolet absorber. An ultraviolet-absorbent self-dispersible water-base vinyl resin is obtained by conducting the solution polymerization of a monomer mixture containing as the essential components 20 to 95 wt % of a polymerizable monomer having a molar extinction coefficient of 10,000 or above and bearing an ultraviolet-absorbent group, such as a (meth)acrylamide monomer, a (meth)acrylate monomer or a substituted vinylbenzene monomer, respectively represented by general formulae (I), (II) or (III), and 80 to 5 wt % of a monomer bearing a salt-forming group, adding, if necessary, a neutralizing agent to the reaction mixture to ionize the salt-forming group, adding water to the resulting system, and distilling off the solvent to thereby cause phase inversion into a watery system. In formulae (I), (II), (III), R1 represents hydrogen or methyl; R2 represents hydrogen or C1 to C4 alkyl; and Y represents an ultraviolet-absorbent group. An ultraviolet-absorbent fine resin particle is obtained by dehydrating the above resin.
    • 可以以高浓度与化妆品基质等混合的紫外线吸收剂水基乙烯基树脂或其微粒的乳液的制造方法是高度安全的,并且可以充分发挥作为紫外线的效果 吸收。 紫外线吸收剂的自分散性水基乙烯基树脂通过以含有摩尔消光系数为10,000以上的聚合性单体20〜95重量%为主要成分的单体混合物进行溶液聚合而得到, 吸收剂基团,例如(甲基)丙烯酰胺单体,分别由通式(I),(II)或(III)表示的(甲基)丙烯酸酯单体或取代的乙烯基苯单体,和80〜5重量% 含有成盐基团的单体,如果需要,向反应混合物中加入中和剂以使成盐基团离子化,向所得体系中加入水,并蒸发溶剂,从而导致相转化为水系。 在式(I),(II),(III)中,R 1表示氢或甲基; R 2表示氢或C 1至C 4烷基; Y表示紫外线吸收剂。 通过使上述树脂脱水得到紫外线吸收性树脂微粒。