| abstract |
PURPOSE:To obtain the lithography printing plate having an excellent stability during a lapse of time and having no remaining material in a nonimage part after developing by incorporating a specific triazine free radical forming agent soluble to an alkaline aqueous solution to the composition. CONSTITUTION:The sensitive resist forming composition is prepared by compounding 4,6-bis(halomethyl)-s-triazine free radical forming agent which is soluble to an alkaline aqueous solution and is shown by the formula, and a coloring matter such as an arylamine, a leuco base which inter-reacts with the photodecomposition product of said agent, thereby discoloring from a colorless to a color. The lithography printing plate having no stain and a clean and a good contrast is obtd. by coating the prescribed composition on an anodic oxidized Al substrate, drying to form the sensitive layer and then by exposing and developing. Thus, the printing composition having a sensitivity against a fat and an anti-printing property is obtd. |