Dibenzoxaphosphorin compounds
US4732997A · kind A · utility
2Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Nov 18, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/132
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Photographic material containing magenta coupler is stabilized by incorporating a dibenzoxaphosphorin of the formula ##STR1## into the emulsion layer containing the coupler or into an adjoining colloid layer. The yellowing on dark storage of such material is substantially reduced as a result. The symbols A and n are defined in claim 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.