Process for the manufacture of planographic printing forms

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

G - Physics

03

F

96/219, 96/6

G03F 7/40 (2006.01)

Patent

CA 1084758

Abstract of the Disclosure This invention relates to an improvement in the process for the manufacture of a planographic printing form in which a light-sensitive material comprising a support having a hydrophilic surface and a copying layer thereon containing a light-sensitive diazo or azido compound is imagewise exposed, developed, and then beated sufficiently long and at such a temperature, at least 180°C, that the oleophilic image areas are decomposed and a deposit is formed in the hydrophilic background areas, the improvement comprising, after development but prior to the thermal treatment, treating the entire surface of the plate with an aque- ous solution of at least one member selected from the group consisting of a water-soluble organic substance and a water-soluble inorganic salt.

255818

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