PHOTOSENSITIVE COMPOSITION AND PHOTOSENSITIVE PLANOGRAPHIC PRINTING PLATE AND ITS DEVELOPING METHOD

摘要

PURPOSE: To provide a photosensitive compsn. having excellent coatability as well as a photosensitive planographic printing plate having excellent adaptability to an aq. alkaline soln. and its developing method. CONSTITUTION: This photosensitive compsn. is prepd. by mixing (1) a solvent having a viscosity of 0.3 to 2.7cps at 20 deg.C and a solvent having a viscosity of 2.9 to 8.0cps at 20 deg.C or (2) a solvent having surface tension of 15 to 25dyne/ cm at 20 deg.C and a solvent having surface tension of 26 to 55dyne/cm at 20 deg.C or (3) a solvent having a sp. gr. of 0.80 to 0.93g/cm<3> at 20 deg.C and a solvent having a sp. gr. of 0.94 to 2.00g/cm<3> at 20 deg.C. This photosensitive planographic printing plate is formed by applying either one of the photosensitive compsns. (1) to (3) on a base having hydrophilicity. This method for developing the photosensitive planographic printing plate described above comprises developing the printing plate with the aq. alkaline soln. having pH of >=12.