| 摘要 |
PURPOSE:To obtain stably sensitivity, hard contrast, sharpness, resolving power, print resisting power, etc. by incorporating a specific sensitizing dye in a silver halide emulsion layer contg. at least 50mol% silver chloride. CONSTITUTION:A sensitizing dye expressed by the general formula is incorporated in a silver halide emuslion layer contg. at least 50mol% silver halide. In the formula, at least one of Z1, Z2 denote a benzothiazole nucleus having a substituent in the 5th place (however, an alkyl group is limited to the methyl group only), a non-metallic atom group necessary for completing benzoseleazole nucleus, R1, R2 are alkyl, aryl, alkenyl, aralkyl group, at least one of R1, R2 denote a substd. alkyl group having a sulfo group or carboxyl group, R3 denotes an alkyl group (however, in the case of a methyl group, the above-mentioned substituent in the 5th place is limited to the halogen only), aryl group, aralkyl group, x denotes cation and m denotes 1, 0. |
