Ultraviolet absorbent, photostabilizer, ultraviolet ray-absorbing composition, photostabilized composition and external prepraration for skin
申请人:Shiseido Co., Ltd.
公开号:US20030198608A1
公开(公告)日:2003-10-23
Providing an ultraviolet absorbent or photostabilizer with excellent absorption over a wide ultraviolet wavelength range and great stability and a high safety profile, as well as an ultraviolet-absorbing composition, a photostabilized composition and an external preparation for skin, where the pyridazine derivative of the following general formula and/or a salt thereof is included as the effective component of the ultraviolet absorbent or photostabilizer, or is included in the ultraviolet-absorbing composition, the photostabilized composition and the external preparation for skin:
1
Wherein R
1
, R
2
, R
3
and R
4
are not simultaneously hydrogen atom; and R
2
and R
3
are not simultaneously morpholino group.