LITHOGRAPHIC PRINTING PLATE PRECURSOR AND PLATE MAKING METHOD OF LITHOGRAPHIC PRINTING PLATE

摘要

By a lithographic printing plate precursor including a support having provided thereon an image-recording layer capable of forming an image by supplying at least any of printing ink and dampening water on a printing machine after image exposure to remove an unexposed area thereof, wherein the image-recording layer contains an infrared absorbing agent, a polymerization initiator, a polymerizable compound and a polysaccharide having a sulfonic acid group or a group made by a salt thereof and a plate making method of a lithographic printing plate using the same, a lithographic printing plate precursor which exhibits good development property while maintaining printing durability of a lithographic printing plate after development and a plate making method of a lithographic printing plate using the same can be provided.

主权项

1. A plate making method of a lithographic printing plate comprising conducting on-press development processing by a method comprising after imagewise exposure of a lithographic printing plate precursor, mounting the exposed lithographic printing plate precursor on a printing machine and supplying at least any of printing ink and dampening water or a method comprising after mounting a lithographic printing plate precursor on a printing machine, imagewise exposing the lithographic printing plate precursor and supplying at least any of printing ink and dampening water,
wherein the lithographic printing plate precursor comprises a support having provided thereon an image-recording layer capable of forming an image by supplying at least any of printing ink and dampening water on a printing machine after image exposure to remove an unexposed area thereof, wherein the image-recording layer contains an infrared absorbing agent, a polymerization initiator, a polymerizable compound and a polysaccharide having a sulfonic acid group or a group made by a salt thereof.