Ultraviolet absorbing compounds and photographic elements containing them
US5635343A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Aug 28, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/132
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A substantially inert ultraviolet absorbing compound, and photographic elements containing them, which compound has a peak absorption at less than 400 nm and being of formula (I): ##STR1## wherein: X is O or NR.sub.8, Z represents the atoms necessary to complete a 5-membered or 6-membered heterocyclic ring which includes X and N, and the 3-position of the pyrazolone ring may independently be substituted or unsubstituted; PA1 R.sub.5 is alkyl, alkenyl, or arylalkyl any of which may be substituted or unsubstituted, or R.sub.5 may form a ring with a 3-position substituent on the pyrazolone ring or a 4-position substituent on the benzo ring; PA1 R.sub.7 is alkyl, alkenyl, aryl, or heterocycle, any of which may be substituted or unsubstituted, or H; and PA1 R.sub.8 is alkyl, alkenyl, or arylalkyl any of which may be substituted or unsubstituted, or H.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.