POSITIVE LITHOGRAPHIC PRINTING PLATE PRECURSOR AND METHOD FOR PRODUCING THE SAME

摘要

An object of the present invention is to provide a CTP positive working lithographic printing original plate capable of developing using a negative developing solution. The present invention provides a positive working lithographic printing original plate having (1) a substrate thereon (2) a lower layer containing a water-insoluble and alkali-soluble resin and a photothermal conversion material, and (3) an uppermost layer containing a water-insoluble and alkali-soluble resin, wherein the lower layer contains (a) a polymer having a perfluoroalkyl group and/or (b) a polymer having a siloxane group.