Method of forming an image with a photographic cuprous halide material
US4427762A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1982 |
| Grant date | Jan 24, 1984 |
| Priority date | — |
| Expiry date | Dec 15, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/725
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image-forming method wherein a photosensitive material comprising a support having a photosensitive copper (I) halide emulsion that contains silver halide and which has grains of copper (I) halide crystal dispersed in a binder is subjected to imagewise exposure and development with an alkaline solution is disclosed. The imagewise exposure is effected either in a dry or wet state. The alkaline solution contains compounds selected from at least two of the following three groups: (A) a group consisting of .alpha.-amino acids, .alpha.-amino acid derivatives, aliphatic carboxylic acids, oxycarboxylic acids, ketocarboxylic acids, aromatic carboxylic acids, amines, amine derivatives, aminocarboxylic acids, quinoline derivatives and pyridine derivatives, which compounds have a stability constant for Cu(II) complex between 5 and 15; (B) a group consisting of 4-aminophenols and 3-pyrazolidones; and (C) a group consisting of ascorbic acid derivatives of the following formula (I) and alkali metal salts thereof: ##STR1## wherein R is a hydrogen atom or a hydroxyl group; n is a positive integer of from 1 to 4, and when n=1, R represents only a hydroxyl group. The result is an image of improve…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.