| 摘要 |
PROBLEM TO BE SOLVED: To simplify manufacturing and printing plate making steps and to improve image reproducibility and plate wear resistance by forming a laser sensitive thermosensitive layer provided on a base as a layer containing thermoplastic polymer fine particles containing a hydroxyl group, an amine compound and a solvent soluble binder polymer as main components. SOLUTION: A thermosensitive layer containing thermoplastic polymer fine particles having a hydroxyl group in a molecule and an amine compound dispersed in a binder polymer is provided on a base having a hydrophilic surface. It is good to use the particles which have the hydroxyl group and which are thermoplastic and have a glass transition temperature of about 120 deg.C or lower, and its lower limit is about 10 deg.C or higher. The amine compound has an operation as a crosslinker and easily reacts with the hydroxyl group of the polymer to three-dimensionally crosslink and insolubilize the polymer. Since it is necessary to dissolve to remove a non-laser illuminated part after an image is formed by the laser, it is necessary that the polymer is soluble in water or an organic solvent. |
