Spectral sensitization of silver halide lippmann emulsions
Abstract
Abstract PHOTOGRAPHIC SILVER HALIDE EMULSIONS OF THE LIPPMANNTYPE ARE DESCRIBED WHICH COMPRISE AS A SPECTRAL SENSITIZER A MEROCYANINE DYE OF THE FORMULA: 2-(S=),3-R3,4-(O=),5-((-N(-R1)-Z-)>C=CH-C(-R2)=) THIAZOLIDINE WHEREIN: Z REPRESENTS THE ATOMS NECESSARY TO CLOSE A PYRROLINE NUCLEUS OR A TETRAZOLE NUCLEUS, R2 REPRESENTS HYDROGEN, AN ALIPHATIC GROUP OR AN ARYL GROUP, AND EACH OF R1 AND R3 STANDS FOR AN ALIPHATIC GROUP OR AN ARYL GROUP, ONE OR R1 AND R3 COMPRISING A SULPHO GROUP, A CARBOXY GROUP, A SULPHATO GROUP, A PHOSPHONE GROUP OR A SULPHAMOYL OR SULPHONYL-CARBAMOYL GROUP. THESE DYES HAVE AN EXCELLENT SENSITIZING ACTION IN THE GREEN REGION OF THE SPECTRUM AND CAN BE USED IN HIGH CONCENTRATIONS WITHOUT LEAVING RESIDUAL STAIN IN THE EMULSION AFTER PROCESSING AND WITHOUT PRODUCING FOG.
Inventors
- 👤 Herman Adelbert Philippaerts
- 👤 Theofiel Hubert Ghys
- 👤 Henri Depoorter
Bibliographic Details
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