Lithographic printing plate precursor and method of preparing the same

摘要

The present invention provides an infrared sensitive lithographic printing plate precursor of positive-type comprising a support having a hydrophilic surface and an image recording layer comprising: an anionic surfactant; an infrared absorbing agent; and a poly (vinyl acetal) resin, wherein the image recording layer has a configuration in which a lower layer on the side of the support and an upper layer on the side opposite thereto are disposed on the support in this order, the upper layer and/or the lower layer comprising the polyurethane resin, the anionic surfactant and the infrared absorbing agent in the same layer, or in a separate layer.