Patent ID: 6284433
Filing Date: 2001-09-04
Classification: B41C,Y10S

Abstract:
A method of producing a directly imageable waterless planographic printing plate, which has at least a heat sensitive layer and an ink repellent layer in this order on a substrate, comprising:imagewisely irradiating a precursor of the printing plate with a laser beam,pre-treating the precursor by a pre-treatment liquid containing a glycol compound and/or a glycol ether compound represented by the following general formula (I), andremoving the ink repellent layer at the laser beam irradiated area, in this order,wherein the heat sensitive layer is at least partially left on the printing plate after completion of the above steps,wherein the heat sensitive layer comprises a light-heat converting substance, a metal-containing organic compound and an active hydrogen-containing compound andwherein the general formula (I) is the following:R.sup.2 O(--CHR.sup.1 --CH.sub.2 O).sub.n --R.sup.3 (I)wherein R.sup.1 denotes a hydrogen atom or alkyl group with 1 to 5 carbon atoms;R.sup.2 and R.sup.3 denote, respectively independently, a hydrogen atom or alkyl group with 1 to 15 carbon atoms; and n denotes an integer of 1 to 12.