Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1983-03-03
1984-12-25
Brown, J. Travis
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430570, 430583, G03C 102
Patent
active
044904630
ABSTRACT:
Alkanediyl bridged benzimidazolo monomethine cyanine dyes are disclosed wherein at least one benzimidazolo nucleus is provided with an electron-withdrawing group. A disclosed preparation of the dyes includes producing an electron-withdrawing group substituted bis(2-nitrophenyl)-2-R.sup.1 -propanediamide, where R.sup.1 is hydrogen or alkyl; converting the nitro groups to primary amine substituents; removing the elements of water to effect ring closure; and thereafter providing the -CR.sup.1 - linked benzimidazole nuclei so formed with an N,N'-alkanediyl bridging group and quaternizing substituents. Dye synthesis is completed by reducing the -CR.sup.1 - linking group to the corresponding methine. The dyes are useful as sensitizers in silver halide emulsions and photographic elements.
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patent: 3337578 (1967-08-01), Bader et al.
patent: 3622317 (1971-11-01), Bird et al.
patent: 3904637 (1975-09-01), Lincoln et al.
Brown J. Travis
Eastman Kodak Company
Thomas Carl O.
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