Process for the production of lithographic printing plates utilizing peel development
AssigneeAgfa-Gevaert
InventorWilli-Kurt Gries
Life of this patent
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Abstract
A photosensitive material useful for the production of lithographic printing plates, which contains (a) a support suitable for lithographic printing plates, (b) a hydrophilic layer which contains a crosslinkable organic polymer or is a layer formed by crosslinking such a polymer, (c) a photopolymerizable layer and (d) a transparent cover film, the adhesion of the photopolymerizable layer (c) to the hydrophilic layer (b) and/or to the cover film (d) being changed by exposure. The material permits the production of lithographic printing plates having high printing performance without the use of liquid processing agents.
Claims20
A process for the production of a lithographic printing plate, comprising
- exposing a material which comprises in the following order:
- (a) a support suitable for lithographic printing plates,
- (b) a hydrophilic layer which comprises a crosslinkable organic polymer or is a layer formed by crosslinking an organic polymer, and which has a layer weight in the range from 0.001 to 1 g/m.sup.2
- (c) a photopolymerizable layer, and
- (d) a transparent cover film,
- wherein the adhesion of the photopolymerizable layer (c) to the hydrophilic layer (b) and/or to the cover film (d) is changed by exposure, imagewise, through the cover film (d), and
- developing the exposed material by peeling off the cover film (d) from the support (a),
- wherein the polymer of the hydrophilic layer (b) is crosslinked before or after exposure.
Dependencies are inferred from the claim text.