Method of introducing water insoluble sensitizers or...

Details Method of introducing water insoluble sensitizers or... Method of introducing water insoluble sensitizers or...

G - Physics

03

C

96/105, 96/146

G03C 1/06 (2006.01) G03C 1/005 (2006.01) G03C 7/388 (2006.01)

Patent

CA 1105761

METHOD OF INTRODUCING PHOTOGRAPHIC ADDITIVES INTO SILVER SALT EMULSIONS Abstract of the Disclosure Photographic additives such as spectrally sensitizing dyes and stabilizers for silver salt emulsion can be incorporated by making first an aqueous dispersion of the sensitizer or stabilizer by milling said substances to form particles of an average grain size of less than 1 /um in an aqueous phase which is substantially free from organic solvents in the presence of a dispersing agent which gives rise to a surface tension of not less than 38 dyn/cm in water when used in a quantity of 1g/1. The aqueous dispersion of sensitizer or stabilizer may then be taken up in an aqueous hydrophilic binder solution, and may then be prepared for further use or storage by freeze-drying or spray drying. A-G 1413

273559

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