Silver halide emulsion containing an arylphosphonium salt as antifoggant
US3951661A · kind A · utility
4Cited by
2References
4Claims
0Family size
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Key dates
| Filing date | May 24, 1974 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | May 24, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/54
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Substances of the structure ##EQU1## wherein Z is phosphorus, X.sup.-is Cl.sup.-, Br.sup.-, ClO.sub.2 .sup.- or BF.sub.4 .sup.-, and R.sub.1 - R.sub.4 are alkyl or aromatic groups are excellent inhibitors of fog formation when incorporated in photographic emulsions containing silver halides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.