Thiacyanine betaine blue sensitizing dyes

Details Thiacyanine betaine blue sensitizing dyes Thiacyanine betaine blue sensitizing dyes

C - Chemistry, Metallurgy

09

B

96/125, 96/199,

C09B 23/04 (2006.01) C07D 277/84 (2006.01) G03C 1/16 (2006.01)

Patent

CA 1105029

ABSTRACT OF THE DISCLOSURE Photosensitivity of a blue-sensitive emulsion in a multi-color diffusion transfer photographic system is enhanced by sensitizing the emulsion with certain 3,3'-di- substituted 4,5-benzothia-thiacyanine betaines of the general formula Image wherein R is methyl, ethyl, or sulfopropyl, R1 is alkyl of 1 to 4 carbon atoms, or sulfoalkylene of between 1 and 4 carbon atoms, only one of R and R1 being a sulfo moiety, and wherein X is hydrogen, fluorine, chlorine or methyl. These compounds impart adequate blue sensitivity to an emulsion without losses in D-max without sensitivity loss in the presence of emulsion stabilizers.

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