SILVER HALIDE PHOTOGRAPHIC SENSITIVE MATERIAL

摘要

PURPOSE:To improve sensitivity and to decrease the performance fluctuation in the change of conditions for developing process which is the defect of twin particles by combining a pyrazoloazole coupler with the twin particles having <8:1 average aspect ratio. CONSTITUTION:This material is provided with at least one layer of the layer contg. the twin emulsion having <8:1 average aspect ratio and the pyrazoloazole coupler expressed by formula I. The twin particles themselves have high sensitivity if the aspect ratio is >=8:1, but the effect by the combination is not obtd. and the particles are considerably susceptible to the fluctuation in the conditions for the developing process. The diameter of the twin particles is further preferably 0.2-5mum and the silver halide compsn. of the twin particles consists preferably of silver iodide or silver iodobromide. The silver iodobromide having 0-20mol% silver iodide content is more preferable. The embodiment of the pyrazoloazole couple is shown by formula I-1.