On-press development type lithographic printing plate precursor, method for preparing lithographic printing plate, and lithographic printing method

Abstract

An on-press development type lithographic printing plate precursor has an aluminum support and an image-recording layer on the aluminum support, in which the image-recording layer contains an infrared-absorbing polymethine colorant having HOMO of −5.2 eV or less, a polymerization initiator, and a polymerizable compound having 7 or more polymerizable functional groups and contains or does not contain a polymer having a molecular weight 10,000 or more. In a case where the image-recording layer contains the polymer having a molecular weight of 10,000 or more, a ratio Wp/Wm of a content Wp of the polymer having a molecular weight of 10,000 or more to a content Wm of the polymerizable compound having 7 or more polymerizable functional groups is 1.00 or less.

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