Cyanine dyes and their use as spectral sensitizers in direct...

Details Cyanine dyes and their use as spectral sensitizers in direct... Cyanine dyes and their use as spectral sensitizers in direct...

C - Chemistry, Metallurgy

09

B

96/115, 260/300,

C09B 23/00 (2006.01) C09B 23/06 (2006.01) G03C 1/12 (2006.01) G03C 1/485 (2006.01)

Patent

CA 1052795

ABSTRACT OF THE DISCLOSURE New cyanine dyes, comprising at least one of the following nuclei (or derivatives thereof): 1) 2,3,3-trimethyl-5-phenyl-sulfonyl-indolenine; 2) 2,3,3-trimethyl-5-benzoyl-indolenine; 3) 1-aryl or alkyl-2-phenyl-5-phenyl-sulfonyl- indole; 4) 1-aryl or alkyl-2-phenyl-5-benzoyl-indole, are desensitizers for silver halide negative emulsions and useful electron acceptor spectral sensitizers for direct positive silver halide emulsions.

202665

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