Title:
PROCESS FOR PRODUCING BOTH OF ULTRAVIOLET-ABSORBENT SELF-DISPERSIBLE WATER-BASE VINYL RESIN AND FINE RESIN PARTICLE
Document Type and Number:
WIPO Patent Application WO/1992/020721
Kind Code:
A1
Abstract:
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.
Inventors:
MINAMI TAKAHIDE (JP)
NOUMI YOKO (JP)
NAKAMURA KOICHI (JP)
NOUMI YOKO (JP)
NAKAMURA KOICHI (JP)
Application Number:
PCT/JP1992/000663
Publication Date:
November 26, 1992
Filing Date:
May 22, 1992
Export Citation:
Assignee:
KAO CORP (JP)
International Classes:
A61K8/81; A61Q17/04; C08F6/14; C08F20/36; C08F212/14; C08F246/00; C08L101/02; (IPC1-7): C08F6/14; C08F8/44; C08F212/14; C08F220/06; C08F220/28; C08F220/36; C08F220/58; C08F220/60; C08F222/02; C08L101/02
Foreign References:
| JPS5316093A | 1978-02-14 | |||
| JPS5025740A | 1975-03-18 | |||
| JPH0291109A | 1990-03-30 | |||
| JPH02180909A | 1990-07-13 | |||
| JPS62109808A | 1987-05-21 |
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