Attachment of gelatin-grafted polymer particles to pre-precipitated silver halide grains
US5399480A · kind A · utility
3Cited by
69References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1993 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Sep 14, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/151
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention describes silver halide packet emulsion grains or crystals that are conventionally precipitated using gelatin of a given isoelectric pH, surrounded by a layer of gelatin-grafted-polymer particles wherein the grafted gelatin has a different isoelectric pH and the said gelatin-grafted-polymer particles are optionally chemically bonded to the gelatin surrounding the silver halide microcrystals. Such packet emulsions can form the basis for a mixed-packet color photographic system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.