Kao Corporation

Toru Tejima

Naotake Takaishi

Genji Imokawa

Koichi Nakamura

Michihiro Hattori

Kimihiko Hori

Tadashi Tamura

Hajime Hotta

A composition for application to the skin to protect the skin from the long wavelength ultraviolet ray comprises a dibenzoylmethane derivative of the following general formula ##STR1## in which X represents a hydrogen atom, a monovalent metal cation, an organic cation, a linear or branched alkyl group having from 1 to 24 carbon atoms, or a polyoxyalkylene oxide having 2 or 3 carbon atoms, Y and Z each independently represent a hydroxyl group, a linear or branched alkyl group having from 1 to 24 carbon atoms, or an alkoxy group having from 1 to 24 carbon atoms, or a polyoxyalkylene oxide group having from 2 to 3 carbon atoms, and m and n are independently an integer of from 0 to 3. The composition is adjustable so as to have an optimum HLB balance and has good compatibility with various cosmetic bases. Further, it does not irritate the skin, is difficult to be percutaneously absorbed and shows continued skin-protecting effects.

Long wavelength ultraviolet ray absorber

4-methoxy-2'-carboxydibenzoylmethane of the following general formula (I) ##STR1## is prepared by reacting p-methoxyacetophenone (III) with phthalic anhydride (II) in accordance with the following reaction equation. ##STR2##

4-methoxy-2'-carboxydibenzoylmethane and its salts

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Kokubunji-machi, Japan

Toru Tejima