PROCESS OF PRODUCTION OF HALOGEN-AND-SILVER PHOTOGRAPHIC EMULSION WITH MICROCRYSTALS

摘要

FIELD: photographic chemistry, preparation of bromine-iodine or bromine-chlorine-iodine-silver photographic emulsion with microcrystals, processes of production of black-and-white, X-ray, color photographic materials of various assignment. SUBSTANCE: process involves preparation of suspension of nucleus microcrystals by single-jet or double-jet injection of alkaline metal or ammonium into solution No.1 containing hydrophilic colloid, ammonium base in the amount of 0.05-0.5 mole/l and water and solution No.2 containing silver nitrite and water with pJ=0.5-3.0 , growth of produced microcrystals by double-jet injection of solution No.2 and solution No.3 containing bromine or mixture of bromine and chloride of alkaline metal or ammonium and water into prepared suspension with constant value of Óéú=1.5-3.5, injection of ammonium base in the amount of 0.1-1.5 mole/l into reaction medium and aging under constant value of Óéú. Solution No.3 may contain up to 55.0 molecular per cent of chloride of alkaline metal of ammonium. At stage of preparation of nucleus microcrystals there is used 1.0-15.0 per cent by weight of silver nitrite of their total amount. Stage of growth of microcrystals can be conducted in presence of mole/mole of total amount of silver nitrite of nitrogen- carrying heterocyclic composition of formula 1, where R1,R2,R are same or H is different, C1-C8 alkyl, or formula 2, where X=S, NH, O, Y=N, C-R , R =H, SH,C1-C5 alkyl, or formula 3, where R =H, SH, C1-C5 alkyl or formula 4, where Q=N-R , S, O, R =H, C1-C5 alkyl, phenyl, n=1 or 2. With n=1 z=H, with n=2 z is absent. Proposed technology makes it possible to prepare assortment of poly ((Cv> 25%)>25.0%) or monodispersive (dav>25.0%) halogen-silver photographic emulsions with microcrystals having ??=0.5-3.0 and aspect of ratio dav:hav=2:1-25:1 with specified granulometric characteristics depe