Kao Corporation

Hajime Hotta

Naotake Takaishi

Genji Imokawa

Koichi Nakamura

Tadashi Tamura

Michihiro Hattori

Katsumasa Iwaya

Toru Tejima

Michiyo Akasaka

A novel anti-suntan cosmetic composition comprises from 1 to 25% by weight of fine particulate zinc oxide having an average particle size of from 70 to 300 m.mu., which scatters or absorbs ultraviolet rays, especially those in UV-A region. The composition prevent human skin from blotches and freckles, and supress the aging of the skin.

Anti-suntan cosmetic composition

A novel long wave UV ray absorber comprising a dibenzoylmethane derivative effectively shuts out UV-A which causes a harmful action on skin. The absorber is insoluble in water, organic solvents, oily substances, sebum and the like, so that percutaneous absorption does hardly take place and the absorber is scarcely removed by water or sweat, thus keeping a high efficacy.

Long wave UV ray absorber

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

Growing community of inventors

Funabashi, Japan

Hajime Hotta