METHOD OF SPECTRAL SENSIBILIZATION OF BROMO-IODO-SILVER PHOTOGRAPHIC EMULSTION TO IR-STACTRUM RANGE Russian patent published in 1995 - IPC

FIELD: photographic material. SUBSTANCE: photoemulsion sensibilization with microcrystal size α = (1± 0,05)=(1 (0,5± 0,1) 0.05) or (0.5 7,7± 0,1 0.1) mcm and content of 3 mol% silver iodide at pAg=7.7 7± 0,1 0.1 and pH 7 8± 0,01·10^-4 0.1 is carried out by addition of substances to photoemulsion melt by the following three sequence schemes: a) C-1 and C-3; b) KC- 1; c) KC-2; d) KC-3; e) KC-4; f) KC-5; g) KC-6; h) KC-7; i) C-2(I); a) C-1 and C-3; b) KC-1; c) KC-2; d) KC-3; e) C-2(II); a) C-1 and C-3; b) KC-1; c) KC-2; d) KC-3; e) KC-4; f) KC-5; g) C-2(II). Additions and their quantities (in brackets) espressed as mole/mole silver halide are give below; if their quantities in different schemes are different then it subdivided: C-1-di-(p- anisyl)phenylphosphine 1± 0,01·10^-2; C-2-C, N-diphenylnitrone(for I-III 2± 0,01·10^-4); C-3-2-heptyl-5-methyl-7-hydroxy-1,3,4- triazidainedolectn (for I-III 3,3′); (KC-1)-3,9′-diethyl- 9,11,$$-bis-11′-dimethyltrimethylene)-thiapentane carbocyanine iodide for (I β,β for II-III 12± 0,1·10^-6; (KC-2)- 1,1-diethyl-6,6± 0,01·10^-6-bis-(trifluoromethylmapcapto)-quino- (4, 6,6′)-tricarbocyamine-p-toluene sulfonate for (4,4′); for II-III-6± 0,01·10^-6; (KC-3)-3,3·10^-6-diethyl-9,11-3,3′- dimethyltrimethylene)-thiatetracarbocyanine iodide for β,β; for II-III 3± 0,01·10^-6; (KC-4)-3,1,5± 0,01·10^-6-diethyl-6,7,-3,3′- dibenzo-11-methylthiatricarbocyaninebutane sulfonate for I and III 6,7,6′,7′; (KC-5)-3, 1,5± 0,01·10^-6-diethyl-11- methylthiatricarbocyanine iodide for I and III 3,3′; (KC- 6)-3,1,5± 0,01·10^-6-diethyl-11-isopropylhydroxythiatricarbocyanine iodide for 3,3′; (Kx-7)-3, 3± 0,01·10^-6-diethyl-5, 3,3′-dimethoxy- 6, 5,5′-bis-(methylmercapto)-9,11-6,6′- dimethyltrimethylene)-10-methylthiadicarbocyanine-p- toluene sulfonate for β,β. Then photoemulsion is prepared for pouring, poured of tricetate buse, exposed and developed. Prepared range is 700-1100 nm with sufficiently uniform spectral sensitirity distribution and resolution power of phorolayers, is 110 0,75± 0,01·10^-6. Photoemulsion can by used for preparing high-seusitive infrachromatic photographic mterials. Additinal compounds were added to photoemulsion by definite sequence. EFFECT: broadened range of uniform spectral sensitivity (70-1100 nm). 6 cl, 1 tbl