Light-sensitive silver halide photographic materials comprising zeolites
US5989797A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1998 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Oct 7, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/52
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light-sensitive silver halide photographic material and a method for preparing said material is provided, wherein said material comprises a support and on one or both sides thereof at least one silver halide emulsion layer and a protective antistress layer as an outermost layer, characterized in that said silver halide emulsion layer(s) and/or said protective antistress layer comprise(s) at least one zeolite loaded with a photographically useful group. Said photographically useful group is a soluble salt, an organic compound releasing chloride, bromide or iodide, a sulfur salt, a selenium salt, a tellurium salt and/or a metal salt of group VIII. Further a method of preparing said light-sensitive silver halide photographic material as described hereinbefore is provided, said method comprising the steps of precipitating silver halide crystals in a colloidally stable aqueous medium by mixing an aqueous silver salt solution and at least one halide solution thereby forming an emulsion; flocculating, followed by decanting, washing and redispersing said emulsion or washing said emulsion by dialysis or ultrafiltration followed by adding one or more colloidally stable solution(s); chemica…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.