Radiation imagery chemistry: process – composition – or product th – Silver halide colloid tanning process – composition – or product
Patent
1999-11-22
2000-11-07
Le, Hoa Van
Radiation imagery chemistry: process, composition, or product th
Silver halide colloid tanning process, composition, or product
G03C 108
Patent
active
061434620
ABSTRACT:
The invention relates to an ultrahigh contrast photographic material comprising a support bearing a silver halide emulsion layer, containing a hydrazide nucleating agent in the emulsion layer or a hydrophilic colloid layer, characterised in that the nucleating agent is a dimeric molecule comprising two monomers linked by a linking group, each monomer of which (a) may be the same or different and (b) comprises an acylhydrazide moiety and a nicotinamide moiety in combination, the material providing unexpectedly good nucleation in the absence of, or with reduced amounts of, booster and in a developer whose pH is variable, and further with lower chemical spread and pepper fog.
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Coldrick Philip J.
Glen Rebecca
Goddard John D.
Jenkins Dawn J.
Eastman Kodak Company
Le Hoa Van
Rice Edith A.
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