ULTRAVIOLET-ABSORBER, LIGHT STABILIZER, AND ULTRAVIOLET- ABSORBING COMPOSITION, LIGHT-STABILIZING COMPOSITION AND SKIN CARE PREPARATION FOR EXTERNAL APPLICATION COMPRISING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an ultraviolet absorber or a light stabilizer exhibiting excellent absorbing performances over a wide range of ultraviolet wavelengths and having high stability and high safety, and to provide an ultraviolet absorbing composition, a light-stabilizing composition and a skin care preparation for external applications comprising the same. SOLUTION: The ultraviolet absorber and the light stabilizer each comprise as an effective ingredient a pyridazine derivative of the general formula [wherein R1 , R2 , R3 and R4 are not simultaneously a hydrogen atom; and R2 and R3 are not simultaneously a morpholino group] and/or a salt thereof. The ultraviolet-absorbing composition, the light-stabilizing composition and the skin care preparation for external applications each comprise the same.