Method of manufacturing silver halide photographic emulsion, silver halide photographic emulsion manufactured by the method, and method of inhibiting aggregation of the emulsion
US6251577A · kind A · utility
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3References
14Claims
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Key dates
| Filing date | Mar 12, 1999 |
| Grant date | Jun 26, 2001 |
| Priority date | — |
| Expiry date | Mar 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for producing a silver halide photographic emulsion comprises a step of spectrally sensitizing a silver halide photographic emulsion material that contains tabular silver halide grains having an aspect ratio of 3 or more in an amount of 50% or more of the total projected area of all the silver halide grains, and a step of performing the spectral sensitization by the addition of a cyanine dye in an amount of 60% or more of the saturated covering amount of the silver halide grains, and the emulsion is produced in the presence of 400 to 2,500 ppm of calcium ions and/or 50 to 2,500 ppm of magnesium ions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.