Patent ID: 7153627

Claim:
A heat-sensitive lithographic printing plate comprising a substrate having a hydrophilic surface and a heat-sensitive layer made of an alkali-soluble polymer formed on the surface of the substrate, wherein an advancing contact angle (θ f1 ) of the surface of the heat-sensitive layer with water at 25° C. is within a range from 70° to 110°, a receding contact angle (θ b2 ) of the surface of the heat-sensitive layer with water at 25° C. after heating at 150° C. for 3 minutes is larger than a receding contact angle (θ b1 ) of the surface of the heat-sensitive layer with water at 25° C. before heating, and a difference in receding contact angle before and after heating, (θ b2 −θ b1 ), is larger than 1° and is smaller than 40°.