Phosphoric diesters which absorb UV rays, method of preparing the same, and cosmetic compositions containing the same

摘要

Phosphoric diesters having formula (1): one phenyl group; R2 is a C2-12 linear or branched alkylene group which may optionally be inserted with an oxygen atom between carbon atoms thereof; L is a C2-40 linear or branched alkyl group which may optionally be inserted with an oxygen atom between carbon atoms thereof or the group R1-O-R2; M is a hydrogen atom, an alkali metal ion, a metal ion of di- or higher valence, an ammonium group, an alkanolammonium group having 2 to 14 carbon atoms, C1-14 alkylammonium group; and n is the valence of M are useful UV absorbing compounds. The phosphoric diesters remain on the skin for long periods of time and exhibit lasting UV shielding effects. The compounds and the cosmetic compositions containing the compounds are very safe to the skin.