Silver salt diffusion transfer reversal process

US4720447A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Rene De Keyzer · Bornem, BE
• Leon L. Vermeulen · Herenthout, BE
• Robert J. Pollet · Vremde, BE

Key dates

• Filing date: Oct 9, 1986
• Grant date: Jan 19, 1988
• Expiry date: Oct 9, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C8/06
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Method of making images by image-wise exposing a silver halide emulsion layer, developing it with an alkaline processing solution in the presence of a silver halide solvent and causing silver complexes to diffuse from the emulsion layer into a non-light-sensitive image-receiving layer in the presence of development nuclei thereby to form a silver transfer image in that layer, said transfer image formation occurring in the presence of at least one heterocyclic azole compound, which influences the density and tone of said transfer image, said compound being contained in said image-receiving layer and/or in said processing solution and being a heterocyclic azole corresponding to the general formula: ##STR1## wherein Y is .dbd.N-- or .dbd.HC--; Z represents atoms completing a heterocycle; A is a chemical bond or the group --(L.sup.1).sub.n --Alk--(L.sup.2).sub.m -- wherein n is 0 or 1, L.sup.1 is --S--, Alk is alkylene, which can be substituted and/or interrupted by hetero atom(s) or group(s) containing a hetero atom, arylene, or alkenylene; m is 0 or 1, L.sup.2 is --S--, --Se--, or --N(R.sup.2)--, wherein R.sup.2 is H or alkyl; X is alkyl, alkenyl, aryl, or heterocyclyl, which can be …