DIRECT WRITING TYPE LITHOGRAPHIC PRINTING ORIGINAL PLATE AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a direct writing type lithographic printing original plate having favorable developing properties. SOLUTION: In this direct writing type waterless lithographic printing original plate having at least a heat sensitive layer and an ink repellent layer in the order named on a board, the insolubilization percentage of the heat sensitive layer in tetrahydrofuran lies with the range of 40 to 95%.