Silver halide photographic elements spectrally sensitized with an acetylenic analog of cyanine or merocyanine dyes
US4025349A · kind A · utility
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4References
11Claims
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Key dates
| Filing date | Mar 5, 1975 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | Mar 5, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B23/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Novel methyne dyes comprising two auxochromic groups of the type used in a cyanine or merocyanine dye linked by a carbon atom chain wherein each of the carbon atoms have an unsaturated linkage to at least one adjacent carbon atom in the chain and at least one pair of carbon atoms in the chain being joined by a triple bond or, in an alternate resonance form, the chain including three consecutive carbon to carbon double bonds. The dyes are useful as spectral sensitizing dyes for silver halide emulsions and as intermediates for synthesizing chain-substituted methine dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.