Ultraviolet absorbent, photostabilizer, ultraviolet ray-absorbing composition, photostabilized composition and external preparation for skin
US6676932B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2002 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Aug 2, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61Q5/065
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
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: Wherein R1, R2, R3 and R4 are not simultaneously hydrogen atom; and R2 and R3 are not simultaneously morpholino group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.