Chemical sensitisation of silver halide emulsions
US5604084A · kind A · utility
5Cited by
12References
20Claims
0Family size
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Key dates
| Filing date | Oct 19, 1995 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Oct 19, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of chemical sensitisation which comprises providing a silver halide emulsion containing negative-acting silver halide grains, and adding to said silver halide emulsion a sulphur releasing organic polymer having multiple sulphur releasing groups per polymer molecule. The polymer preferably has at least 10 sulphur releasing groups per molecule which may be selected from thiocarbonate, dithiocarbonate, trithiocarbonate, dithioester, thioamide, thiocarbamate, dithiocarbamate, thiouram, thiourea, dithiooxamide, thioketone and trisulphide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.