THERMALLY SENSITIVE DIRECT TYPE LITHOGRAPHIC ORIGINAL PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a lithographic original printing plate obtainable in an inexpensive price which dissolves the problems inherent to the ordinary direct type offset printing materials, having the characteristics of a high anti-wearing plate with a high dimensional accuracy in a planographic printing.;SOLUTION: Letter-setting portions are transformed into being hydrophobic by a reaction of the functional group of a three-dimensionally cross 1 inked hydrophobic binding polymer with a particularly blocked isocyanate dispersed in size of less than 0.3 μm in the hydrophobic binding polymer. In this way, a lithographic original printing plate can be provided in a simple way and an inexpensive price, having the characteristics of a high anit-wearing plate with high dimensional accuracy, further, enabling one to avoid any generation of waste-disposals since no developing process is involved during the plate- making process.;COPYRIGHT: (C)2001,JPO