| 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. <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 sensitizing dye having maximum absorption in the wavelength region of 350-450 nm, (B) a borate compound, (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 on a hydrophilic support is exposed with laser beam of 350-450 nm, and that the plate surface is rubbed with a rubbing member in the presence of a developer of pH 2-10 using an automatic processing machine equipped with the rubbing member to remove the protective layer and an unexposed portion of the photosensitive layer. <P>COPYRIGHT: (C)2007,JPO&INPIT |
