Patent ID: 7056644

Claim:
A method for producing a photosensitive planographic printing plate comprising: (i) carrying out electrolysis to an aluminum support in an aqueous solution of hydrochloric acid or nitric acid so as to provide the aluminum support with a roughened surface; (ii) coating a photosensitive composition on the roughened surface of the aluminum support to obtain a photosensitive layer, the photosensitive composition containing: (A) a monomer having an ethylenic double bond which is also polymerizable; (B) a photoinitiator composition containing an iron arene complex compound; and (C) a polymer binder, (iii) drying the photosensitive layer, wherein a content of hydrochloric acid or nitric acid in the aqueous solution for electrolysis is 0.4 to 2.8 weight % based on the total weight of the aqueous solution; an electric current density applied during electrolysis is 30 to 100 A/dm 2 ; and a time period for electrolysis is 10 to 120 seconds; and the photoinitiator composition contains a dye having a maximum absorption in a range of 350–600 nm.