MANUFACTURE OF PRINTING PLATE FOR LITHOGRAPHY

摘要

PURPOSE:To easily obtain a printing plate of high quality by covering a substrate with a silicone layer to be subjected to selective plasma treatment with a patterned protective layer and making the protective layer of photosetting organopolysiloxane which is about equal to the silicone layer in surface tension. CONSTITUTION:Silicone layer 2 and photosetting organopolysiloxane layer 3 are laminated on support 1, irradiated with ultraviolet rays 5 through original plate 4, developed, and fixed to form patterned protective layer (set film of organopolysiloxane) 3' and exposed surface 2' of layer 2. By applying activated chemical species 6 in a plasma state through layer 3' as a mask surface 2' is selectively made lipophilic to form ink receiving portion (printing area) 2'', and then layer 3' is exfoliation-removed from layer 2 to obtain a printing plate for lithography having portion 2'' and ink repellent portion (non image area) 7.