Lithographic printing plate precursor

Details Lithographic printing plate precursor Lithographic printing plate precursor

B - Operations, Transporting

41

N

B41N 1/14 (2006.01) G03F 7/00 (2006.01) G03F 7/004 (2006.01) G03F 7/11 (2006.01)

Patent

CA 2612712

An object of the present invention is to provide a lithographic printing plate precursor which is less apt to suffer from contamination by ablation in forming an image and having an excellent printing performance through image formation. A lithographic printing plate precursor comprises a base material (I), a photosensitive layer (II) containing a light/heat conversion agent on the base material (I), and a layer (III) covering the photosensitive layer (II), wherein the layer (III) covering the photosensitive layer contains both a water-soluble polymer and a hydrophobic polymer, and contains substantially no light/heat conversion agent is provided. The layer (III) covering the photosensitive layer is preferred to contain the water-soluble polymer and the hydrophobic polymer in a proportion of from 10:90 to 90:10 by mass.

La présente invention concerne un précurseur de plaque d'impression lithographique moins susceptible de subir une contamination par ablation lors de la formation d'image et fournissant, par formation d'image, une plaque d'impression offrant d'excellentes performances d'impression. Ledit précurseur comprend un substrat (I), une couche photosensible (II) formée sur le substrat (I) et contenant un agent de conversion de lumière en chaleur, et une couche (III) recouvrant la couche photosensible (II), ladite couche (III) comprenant un polymère hydrosoluble et un polymère hydrophobe et étant sensiblement dépourvue d'agent de conversion de lumière en chaleur. La couche (III) recouvrant la couche photosensible comprend le polymère hydrosoluble et le polymère hydrophobe de préférence dans un rapport allant de 10/90 à 90/10 en poids.

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