| 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: In a thermally sensitive direct printing plate comprising a hydrophilic layer made of a hydrophilic binding polymer derived from the monomer having emulsifying effect and its supporting material, the hydrophilic binding polymer is cross-linked in three dimensions and transformed into a hydrophobic polymer through a letter-setting process. In this way, a lithographic original printing plate can be provided in a simple way with an inexpensive price, having the characteristics of a high anti-wearing plate with a high dimensional accuracy, further, enabling one to avoid any generation of waste-disposals since no developing process is involved during the plate-making process. |
