Patent ID: 7316883

Claim:
A heat-sensitive lithographic printing plate comprising: a support with a hydrophilic surface; and an image-forming layer containing a microcapsule, a light-to-heat converting agent, and a water-soluble compound, wherein the microcapsule contains a reactive group-containing hydrophobic compound, the water soluble compound has a reactive group capable of reacting with the hydrophobic compound, and the image-forming layer contains the water-soluble compound outside the microcapsule; and wherein the water-soluble compound is a compound represented by one of formulae (2) to (10): wherein Zs each independently represent a group having a structure below, and Zs in the molecule are the same or different: and, wherein X represents a hydrogen atom or methyl group, Y represents a structure below, n represents the number of ethylene oxide and proplene oxide units, and the sum total of ns of substituents in the molecule is an integer of 0 to 40: wherein the water-soluble compound has at least one selected from the group consisting of an ethylene oxide chain and a propylene oxide chain in the molecule in an amount of 1 to 40 units.