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Title:
PRODUCTION OF ORGANIC SILVER SALT
Document Type and Number:
Japanese Patent JPH01100177
Kind Code:
A
Abstract:

PURPOSE: To obtain an organic silver salt, having high sensitivity and capable of providing an image with the high maximum concentration and hardly any fog without reducing development speed, by reacting a compound, such as benzotriazole, with silver nitrate while keeping pH within a specific range.

CONSTITUTION: A compound expressed by formula IWIII (Z1WZ3 each are atomic group required to form a 5-W9-membered heterocylic ring), e.g. benzotriazoles (formula I), 2-mercaptobenzothiazoles (formula II) or hydroxytetraazaindenes (formula III), is reacted with silver nitrate at 10W90°C temperature while keeping pH at ≥2, especially with the range of 2.5W10 to afford the aimed organic silver salt. The reaction can be carried out in the presence of a silver ion complex-forming compound (e.g. ammonia or thiocyanate) to control the particle size of the formed organic silver salt. If the organic silver salt is contained in a photosensitive material using a silver halide, the organic silver halide is preferably converted into a hydrophilic binder dispersion (regulated to pH5.5W9.5).


Inventors:
YOKOGAWA TAKUYA
Application Number:
JP1987000158340
Publication Date:
April 18, 1989
Filing Date:
June 25, 1987
Export Citation:
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Assignee:
FUJI PHOTO FILM CO LTD
International Classes:
C07D239/54; C07D231/10; C07D235/28; C07D249/12; C07D249/18; C07D277/72; C07D285/12; C07D285/135; C07D487/04; C07D521/00; C07F1/10; G03C1/498; (IPC1-7): C07D231/10; C07D235/28; C07D239/55; C07D249/12; C07D249/18; C07D257/04; C07D277/72; C07D285/12; C07D487/04; C07D521/00; C07F1/10; G03C1/02



 
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