| abstract |
PURPOSE: To obtain an anti-suntan composition comprising a specific substituted 1,3-diketone and a support, and suitable for local application to the human skin or hair to protect it from excessive exposure to ultraviolet radiation. n CONSTITUTION: This anti-suntan composition comprises pref. 0.01-15wt.% of a substituted 1,3-diketone having an ultraviolet absorption band of 250-500nm and extinction coefficient of 5,000-70,000, pref. a compound of formula I [R 1 and R 2 are each a (substituted) benzylidine or (substituted) phenyl] or its tautomer of formula II, e.g. di-4-hydroxy-3-methoxycinnamoylmethane, 1,3- propanedione-1-(4-methoxy-5-benzofuranyl)-3-phenyl, and a physiologically acceptable vehicle for the substituted 1,3-diketone. n COPYRIGHT: (C)1991,JPO |