Development of photographic silver halide material
US4072523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 1976 |
| Grant date | Feb 7, 1978 |
| Priority date | — |
| Expiry date | Jan 13, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/043
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is described of developing a photographic silver halide element containing developable silver halide by development in the presence of a development accelerator which is a compound corresponding to the following general formula and containing in its molecule at least one thioether sulphur atom linked to two carbon atoms: ##STR1## WHEREIN: R is hydrogen, hydroxy, hydroxyalkyl, alkoxy, alkylthio or alkylamino, PA1 Alk is en alkylene group which may be interrupted by --O--, --S--, or --N(Q)-- wherein Q is hydrogen or a C.sub.1 -C.sub.5 alkyl group, PA1 X is --O--, --S-- or --N(Q)-- wherein Q has the above meaning, and the value of z and the significance of Y are interdependent : PA1 z being 1 for Y being hydroxy or the group --X'--Alk'--R' wherein PA1 X', alk' and R' have the same significance as X, Alk, and R, PA1 z being 2 for Y being --O--, --S-- or --N(Q)-- wherein Q has the above meaning, and PA1 z being a positive integer of at least 1 for Y being the residue of an aliphatic compound with more than one alcohol, thiol or amine function in which all or part of the alcohol-, thiol- or amine-hydrogen atoms are replaced by the group ##STR2## and wherein the or at least one o…
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