Silver halide photographic emulsion and full color recording material containing the same
US5296343A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1991 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Oct 7, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed is a silver halide photographic emulsion spectrally sensitized in the wavelength range longer than 730 nm, and full-color recording materials containing such a photographic emulsion. The photographic emulsion has undergone J-band sensitization by containing at least one compound represented by the following general formula (I) in an amount of from 0.3 to 0.9 based on the specific addition amount defined in the disclosure, at a temperature ranging from 60.degree. C. to 85.degree. C. to gain a spectral sensitivity maximum at a wavelength from 730 nm to 900 nm: ##STR1## wherein Z.sub.1 and Z.sub.2 each represents a sulfur or selenium atom; Q.sub.1 and Q.sub.2 each represents a methylene group; R.sub.1 and R.sub.2 each represents an alkyl group; R.sub.3 represents an alkyl group, an aryl group or a heterocyclyl group; L.sub.1, L.sub.2 and L.sub.3 each represents a methine group; A.sub.1 and A.sub.2 each represents the atoms necessary for completing a benzene ring; R.sub.1 and R.sub.2 may combine with L.sub.1 and L.sub.3, respectively, to form a ring; M.sub.1 represents a counter ion for charge balance; and m.sub.1 represents the numerical value required for neutralization of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.