Epitaxially sensitized tabular grain emulsions containing speed/fog mercaptotetrazole enhancing addenda
US5629144A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1994 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Dec 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C2200/40
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention provides a radiation-sensitive silver halide emulsion comprising PA1 silver halide grains including tabular grains PA2 (a) having {111} major faces PA2 (b) containing greater than 70 mole percent bromide, based on silver, PA2 (c) accounting for greater than 90 percent of total grain projected area, PA2 (d) exhibiting an average equivalent circular diameter of at least 0.7 .mu.m, PA2 (e) exhibiting an average thickness of less than 0.07 .mu.m, and PA2 (f) having latent image forming chemical sensitization sites on the surfaces of the tabular rains, and PA1 a spectral sensitizing dye adsorbed to the surfaces of the tabular grains, PA1 wherein the surface chemical sensitization sites include at least one silver salt epitaxially located on said tabular rains and wherein said grains further comprise a mercapto compound represented by Formula III ##STR1## where R.sup.1 is an aliphatic or aromatic radical containing up to 20 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.