EP 0595031 B1 19971217 - Process for the production of silver halide emulsions
Title (en)
Process for the production of silver halide emulsions
Title (de)
Verfahren zur Herstellung von Silberhalogenidemulsionen
Title (fr)
Méthode de préparation d'émulsions à l'halogénure d'argent
Publication
Application
Priority
DE 4233714 A 19921007
Abstract (en)
[origin: EP0595031A1] The preparation of a silver halide emulsion containing up to 20 mol % of AgI by precipitation of a silver halide emulsion A containing up to 100 mol % of AgI and addition of a silver halide emulsion B containing up to 40 mol % of AgI and having a maximum mean particle size of 0.25 mu m, where emulsion B always has higher solubility in aqueous gelatin solution than emulsion A either due to its particle size or due to its iodide content, in the presence of at least two compounds from the series consisting of imidazole, histidine ( alpha -amino- beta -imidazolyl-(5)-propionic acid) and other monocyclic, 5- or 6-membered, heterocyclic compounds which contain at least one ring nitrogen atom, but no SH groups, and form, in weakly acidic to neutral aqueous solution, low-solubility silver salts which redissolve on addition of ammonia at a pH of > 9, where one of the at least two compounds is imidazole or histidine and at least one other compound is not imidazole or histidine, gives emulsions having an improved sensitivity/particle size ratio.
IPC 1-7
IPC 8 full level
G03C 1/015 (2006.01); G03C 1/035 (2006.01); G03C 1/06 (2006.01); G03C 1/07 (2006.01); G03C 1/34 (2006.01)
CPC (source: EP US)
G03C 1/015 (2013.01 - EP US); G03C 1/06 (2013.01 - EP US); G03C 1/07 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
DE 4233714 A1 19940414; DE 59307852 D1 19980129; EP 0595031 A1 19940504; EP 0595031 B1 19971217; JP H06202257 A 19940722; US 5427904 A 19950627
DOCDB simple family (application)
DE 4233714 A 19921007; DE 59307852 T 19930924; EP 93115452 A 19930924; JP 27290393 A 19931006; US 12573793 A 19930924