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    • 5. 发明专利
    • ULTRAVIOLET ABSORBER
    • JPS63201116A
    • 1988-08-19
    • JP3540387
    • 1987-02-17
    • NARISU COSMETIC CO LTD
    • SUETSUGU KAZUHIROTOMITA SHINJI
    • A61K8/00A61K8/41A61K8/44A61Q17/04C09K3/00
    • PURPOSE:To provide an ultraviolet absorber containing cinnamic acid derivatives as active component, free from toxicity and stimulation to the skin as well as odor and color, effective in absorbing ultraviolet radiation, having excellent compatibility to oily base and organic solvent, etc., and useful as a component of cosmetics. CONSTITUTION:The objective ultraviolet absorber contains, as an active component, at least one compound selected from (A) cinnamic acid derivatives of formula I (R1 is 1-2C aliphatic group; R2 is H or 1-12C straight or branched aliphatic hydrocarbon group) compatible with an oily base and insoluble in water and (B) their salts of formula II (M is Na or K) having high solubility in water. The agent is useful especially for absorbing ultraviolet radiation of long wavelength range (about 400-320nm) and of medium wavelength range (about 320-280nm). It exhibits excellent effect in various kinds of cosmetic, e.g. high solubility in a cosmetic resistant to perspiration as well as in a water- soluble cosmetic. It has high stability to light and heat and is stable to cosmetic bases and cosmetic additives.