C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
96/124, 260/300,
C09B 23/00 (2006.01) C09B 23/01 (2006.01) C09B 23/06 (2006.01) C09B 23/08 (2006.01) C09B 23/10 (2006.01) C09B 23/14 (2006.01) G03C 1/12 (2006.01) G03C 1/485 (2006.01)
Patent
CA 1050990
ABSTRACT OF THE DISCLOSURE. The present invention provides cyanine dyes derived from di-halogen benzoxazole or di-halogen benzothiazole, corresponding to one of the following general formula: Image [I] Image [II] Image [III] Image [IV] wherein: Y represents an oxygen or sulfur atom; n represents a positive integer equal to 2,3,4; m, p represent a positive integer of 1 or 2; q represents a positive integer from 1 to 3; R, R1, equal or different, each represent a halogen ato?; R2 represents a hydrogen atoms, an alkyl group having from 1 to 4 carbon atoms; R3 represents an acyclic hydrocarbon substituent, an alkyl-aryl substituent or an aryl substituent; R4 represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms; R5, R6, equal or different, each represent an alkyl group having from 1 to 6 carbon atoms; X" represents an acid anion; Z represents the atoms selected from only carbon, oxygen, sulfur, nitrogen and selenium required to complete a heterocyclic nucleus containing from 5 to 6 atoms in the heterocyclic ring; Q represents the atoms selected from only carbon, oxygen, sulfur, nitrogen and selenium required to complete a heterocyclic ketomethylene nucleus con- taining from 5 to 6 atoms in the heterocyclic ring. New cyanine dyes derived form di-halogen benzoxazoles and benzothiazoles are desensitizers for silver halide negative emulsions and useful electron acceptor spectral sensitizers for direct positive silver halide emulsions.
202567
Beretta Paolo
Valbusa Luigi
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