SILVER HALIDE PHOTOGRAPHIC MATERIAL FOR MEDICAL RADIOGRAPHY Russian patent published in 2002 - IPC

FIELD: light-sensitive materials. SUBSTANCE: invention relates to radiographic materials for use in fluorography, mammography, and angiography. Material consists of support, gelatin sublayer, light-sensitive layer, and protective gelatin layer consecutively applied on support. Light-sensitive layer is made from silver iodobromide emulsion with average size of silver bromide microcrystals 0.7-1.2 mcm or mixture of emulsions with average size of microcrystals 0.8+/-0.05 mcm and 1.1+/-0.1 mcm taken in proportion between 1:2 and 2:1, and containing (i) stabilizers: substituted dihydroxybenzene of general formula I: (I), wherein R¹ and R² denote hydrogen or group SO₃M, (M = alkali metal); sulfur-containing compound of formula II: (II), wherein R³ denotes hydrogen or alkyl and X alkali metal ion or group ; and mercaptotetrazole derivative with general formula III: (III), wherein R⁴ amino, methoxycarbonylamino group, or hydrogen atom, in quantities between 0,5•10^-4 and 1,0•10^-2 mole/Ag mole; (ii) spectral stabilizer of general formula IV: (IV), wherein Y denotes oxygen, ethylimino, or sulfur; Y₁ sulfur or oxygen atom; B denotes 5-chloro, 5,6-dichloro, 5- ethoxycarbonyl, or hydrogen atom; A hydrogen or lower alkyl; R₅, R₆ lower alkyl or group (CH₂)₃SO₃ -; 4,5-(3-chlorobenzo), 4,5- benzo, or beta-naphtho; X^- halide or anion CH₃C₆H₄SO-3

; and [K]⁺ trialkylammonium or pyridinium cation; or X^- and [K⁺] (in case of internal salt) are missing, in quantities (200-400)•10^-6 mole/Ag mole; (iii) polymer latex; (iv) butyl acrylate/styrene/methacrylic acid terpolymer depicted by general formula V: (V), wherein n : m : q = 7 : 0.5 : 0.5, or methacrylic acid/ethyl acetate copolymer with general formula VI: (VI), in which x : y = 70 : 30; (v) flooding additive. Protective gelatin layer contains polymethylmethacrylate and/or polymer latex of formula V and/or VI. The opposite layer of support is covered by gelatin counterlayer including polymethylmethacrylate and/or polymer latex of formula V and/or VI. EFFECT: extended warranty period (from 18 to 24 months), improved physicochemical characteristics, eliminated adhesion between coils of film at humidity at least 65%, and enabled machining. 3 cl, 2 tbl, 15 ex