Lithographic printing plate precursor and lithographic printing method

Abstract

An on-press development or non-processing (non-development) type lithographic printing plate precursor capable of giving a printout image having a large lightness difference, and a lithographic printing method using this lithographic printing plate precursor are provided, a lithographic printing plate precursor comprising a support and a photosensitive-thermosensitive layer capable of recording an image by infrared laser exposure, the lithographic printing plate precursor being capable of performing a printing by loading on a printing press without passing through a development processing step after recording an image, or by recording an image after loading on a printing press, wherein said photosensitive-thermosensitive layer comprises (1) an infrared absorbent and (2) a discoloring agent or discoloration system capable of generating a color change upon exposure; and the lithographic printing method performing a printing using the above-described lithographic printing plate precursor.

Description

technical field

[0001] The present invention relates to a lithographic printing plate precursor and a lithographic printing method using the lithographic printing plate precursor. More specifically, the present invention relates to a lithographic printing plate precursor capable of directly preparing a printing plate by scanning an infrared laser based on a digital signal of a computer or the like, which enables printing without After a development treatment step, the present invention also relates to a lithographic printing method for printing by using the lithographic printing plate precursor. Background technique

[0002] Lithographic printing plates generally include oleophilic imaged areas that receive ink during the printing process and hydrophilic non-imaged areas that receive conditioning solutions. Lithography is a printing method that utilizes the mutual repellency of water and ink, in which both the oleophilic imaged areas and the hydrophilic non-imaged areas of ...

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