In the production mannered null planographic printing edition

摘要

PROBLEM TO BE SOLVED: To provide a printing plate having excellent characteristics by using a printing master plate which uses a patterned body by a photocatalytic effect, by constituting the master plate having a layer which changes its wettability by pattern exposure, a resin layer, and a part which is made hydrophilic or lipophilic by full surface exposure. ;SOLUTION: The printing master plate 1 is formed directly on a supporting body 2 or with a primer layer 3. The plate is exposed 6 according to a specified pattern 5 to change the alkyl chain of a silicone compd. into an OH group by the effect of a photocatalyst 7 to change the surface wettability according to the exposure pattern. The unirradiated part is in a state of low surface energy 8, while the irradiated part changes its wettability. Then by applying a resin layer compsn. 9, a layer of the resin compsn. 9 is formed in the part where the wettability is changed. Then the resin compsn. is hardened by heat or irradiation of UV rays to form a resin layer, and then exposed all over. Therefore, alkyl chains in the silicone compd. are changed into OH groups by the effect of the photocatalyst in the region where no hardened layer is formed, and the part 8 with low surface energy is changed into a high surface energy part.;COPYRIGHT: (C)1999,JPO