Novel antifogging and/or stabilizing compounds for silver halide photography
US4111697A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Mar 10, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic silver halide material developed in the presence of a novel antifogging or stabilizing compound which is present in the material and/or in the developing composition and corresponds to the following formula: ##STR1## wherein: Q is sulphur or selenium PA1 X is sulphur, selenium or oxygen PA1 Y is sulphur, selenium, oxygen or a single bond, PA1 R.sup.1 stands for an alkyl group having no nitrogen containing substituents or an aryl group, PA1 R.sup.2 represents the same groups as indicated for R.sup.1, provided that only when X represents sulphur or selenium nitrogen containing substituents of alkyl are excluded, PA1 R.sup.3 stands for hydrogen, carboxy in acid or salt form, an alkyl group or an aryl group, and PA1 R.sup.4 stands for hydrogen provided Y represents a single bond, an alkyl group having no nitrogen containing substituents, when Y represents sulphur or selenium and having no hydroxy substituents when Y represents a single bond and X as well as Q represent sulphur or selenium, or an aryl group, PA1 R.sup.3 and R.sup.4 may also form together an alkylene group provided Y is a single bond.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.