METHOD OF MANUFACTURING SILVER-BROMOIODIDE PHOTOGRAPHIC EMULSION AND PHOTOGRAPHIC MATERIAL BASED THEREON Russian patent published in 2003 - IPC

FIELD: light-sensitive materials. SUBSTANCE: invention aims at manufacturing isopanchromatic silver-halide photographic material that could be used for aerial/air and space photography. Silver bromoiodide emulsion with 2.0-5.0 mol % silver iodide is prepared by controlled double-jet emulsification technique, which includes two steps: simultaneously adding silver nitrate aqueous solution and aqueous solution containing potassium bromide and iodide to ammonia-containing aqueous gelatin solution; and precipitation of solid phase, dispersing, and chemical ripening in alkaline medium (pH 9.1-9.9) in presence of N-lower alkyl-substituted 2- lower alkylbenzthiazole, sodium thiosulfate, sodium benzenesulfinate, auro- hydrochloric acid, and 2,2', 2"- photographic material nitrilotriethanol in amount (0,5-3,5)•10^-2 g/g Ag or hydrazine-sulfate un amount (0,9-3,8)•10^-4 g/g Ag. EFFECT: increased light sensitivity of emulsion and resolving capacity of photographic material. 2 cl, 2 tbl, 14 ex