Silver halide photographic material
US4740454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1986 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Jul 17, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/39276
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide emulsion layer containing tabular silver halide grains which have a diameter not less than 5 times the thickness thereof and account for at least 50% of the total projected area of the silver halide grains present in the silver halide emulsion layer and the silver halide photographic material also contains at least one compound represented by following general formulae (I), (II), (III) and (IV): ##STR1## wherein R represents a straight chain, branched chain or cyclic alkylene group, a straight chain or branched chain alkenylene group, a straight chain or branched chain aralkylene group or an arylene group; R.sub.1 represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted aryl group; Z represents a hydrogen atom or a polar substituent; X represents a hydrogen atom, a cation necessary for neutralizing the molecule or a precursor; and n represents 0 or 1. The silver halide photographic material has improved image sharpness not only at high spatial fr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.