Process for the preparation of planographic printing forms

Details Process for the preparation of planographic printing forms Process for the preparation of planographic printing forms

G - Physics

03

F

96/6

G03F 7/40 (2006.01) G03F 7/022 (2006.01)

Patent

CA 1140385

Hoe 78/K 083 PROCESS FOR THE PREPARATION OF PLANOGRAPHIC PRINTING FORMS Abstract of the Disclosure A process for the preparation of planographic printing forms is described, in which a light-sensitive material composed of a support having a hydrophilic surface and of a light-sensitive layer, which contains a 1, 2-naphthoquinone-diazide, is exposed imagewise, developed and then heated to a temperature above 180° C for such a time and at such a temperature level that an oleophilic precipitate is formed on the hydrophilic image back- ground, and the precipitate is then removed by treatment, for ex- ample wiping over, with an aqueous solution of about 0. 01 to 50% by weight of polyvinyl phosphonic acid. The treatment has the advantage that in this case the support surface, for example anodically produced aluminum oxide, is not significantly attacked and is nevertheless completely freed from impurities.

341062

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