Photographic fixer compositions and method for processing a photographic element
US5968720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1996 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Jul 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C5/386
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic fixer compositions comprising a silver halide solvent, an aluminum salt hardening agent, a buffering agent and ammonium ions in amount of at least 0.20 mol/l, wherein said fixer composition also contains at least an aminopolycarboxylic acid sequestering agent of formula (I-a) or (I-b) or a water-soluble salt thereof and d) at least a polyphosphonic acid sequestering agent of formula (II-a), (II-b), (II-c), (II-d') or (II-d"): ##STR1## wherein the substituents are defined in the specification. The present invention also provides a method of processing an exposed photographic silver halide element comprising the steps of developing by means of a developer comprising a silver halide developing agent and treating the developed element with a fixer composition, wherein the fixer composition is one described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.