| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a plate making method in which a lithographic printing original plate having high sensitivity and excellent suitability to safelight is developed with an aqueous developer of pH 2.0-10.0, and also to provide a lithographic printing original plate for use in the method. <P>SOLUTION: The method for making a lithographic printing plate is characterized in that the lithographic printing original plate having a photosensitive layer containing (A) a specific sensitizing dye having an absorption maximum at 350-450 nm, (B) a polymerization initiator, (C) a polymerizable compound and (D) a hydrophobic binder polymer having an acid number of ≤0.3 meq/g and a protective layer in this order is exposed with laser of 350-450 nm, and the protective layer and the unexposed portion of the photosensitive layer are removed by an automatic processing machine equipped with a rubbing member by rubbing the plate surface with the rubbing member in the presence of a developer of pH 2-10. The lithographic printing original plate for use in the method is also provided. <P>COPYRIGHT: (C)2007,JPO&INPIT |
