PRESENSITIZED PLATE HAVING AN ANODIZED ALUMINUM BASE WITH AN IMPROVED HYDROPHILIC LAYER

摘要

A presensitized plate for use in making a planographic printing plate is described, comprising an aluminum plate having an anodized film layer, a hydrophilic layer provided on said anodized film layer and a lithographically suitable light-sensitive layer on said hydrophilic layer, said hydrophilic layer comprising a hydrophilic compound having at least one amino group and at least one group selected from the class consisting of a carboxyl group in the free acid form or salt form, a sulfo group in the free acid form or salt form, and a hydroxyl group has prolonged life on the printing press and at the same time is resistant to scumming on non-image areas.