DIAZO PHOTOSENSITIVE PAPER

PURPOSE:To provide diazo photosensitive paper having high image density, high sensitivity, no unevenness in coating with a diazo photosensitive soln., satisfactory image quality and satisfactory preservability. CONSTITUTION:A precoating layer contg. 30-90wt.% barium sulfate is formed on a substrate by 1.5-5.0g/m and a diazo photosensitive layer contg. silica is formed on the precoating layer to obtain the objective diazo photosensitive paper. Since the precoating layer captures silica with an adsorbed diazonium salt on the surface, the penetration of the diazonium salt into the substrate or the precoating layer is inhibited and the lowering of image density and sensitivity can be prevented. The absorbing property of the precoating layer is made uniform and the occurrence of unevenness in coating can be prevented.