Photographic elements containing indoaniline dummy dyes
US5460930A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1993 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | Oct 28, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/83
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic element comprising a cyan dummy dye present in the element prior to exposure and development, the dye having the formula: ##STR1## wherein: R1 is an alkoxy group, a phenoxy group or a halogen; R2 is selected from the group consisting of an alkyl group, a phenyl group; a halogen when R1 is an alkoxy or phenoxy group; an alkoxy carbonyl group of formula --COOR7; a carbonamido group of formula --NR8COR7; and hydrogen, when R1 is a branched or substituted alkoxy or a substituted phenoxy; R3 is hydrogen or an alkyl group; R4 is hydrogen, or an alkyl group; R5 is hydrogen or an alkyl group; R6 is an alkyl group. R7 is an alkyl group or a phenyl group; R8 is hydrogen or an alkyl group. Dummy dyes of the above specified type are advantageous in elements of the present invention in having good hues, good resistance to fading in weak or seasoned bleach solutions, and having good resistance to hue and density changes in cold storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.