Patent ID: 7361451

Claim:
A lithographic printing method comprising the steps of: imagewise exposing a lithographic printing plate precursor with infrared laser, making a lithographic printing plate by removing unexposed areas of the image-forming layer of the lithographic printing plate precursor mounted on a cylinder of a printing machine; and conducting printing using the lithographic printing plate mounted on the cylinder of the printing machine, wherein the lithographic printing plate precursor is capable of being on-machine developed by supplying at least one of an ink and a fountain solution and comprises a hydrophilic support having provided thereon an image-forming layer containing components (1) to (4): (1) an infrared absorbing agent; (2) a compound capable of generating a radical; (3) a compound capable of undergoing addition polymerization with a radical; and (4) a filler having an average partiele size of from 0.03 to 200 μm.