Dry lithographic forme

G - Physics – 03 – F

Patent

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Details

G03F 7/00 (2006.01) G03F 7/022 (2006.01) G03F 7/023 (2006.01) G03F 7/075 (2006.01)

Patent

CA 2152167

The present invention is a water-less lithographic printing plate, in which a photosensitive layer and a silicone rubber layer are laminated in this order on a substrate, characterized in that the photosensitive layer contains the reaction product between a compound with at least one each of phenolic hydroxyl groups and non-phenolic hydroxyl groups and a quinonediazide compound, or contains both the reaction product between a compound with at least one of phenolic hydroxyl groups and a quinonediazide compound, and the reaction product between a compound with at least one of non-phenolic hydroxyl groups and a quinonediazide compound. The water-less lithographic raw plate of the present invention is excellent in image reproducibility and printing durability, and so can be favorably and economically advantageously used also in the commercial web offset printing and the newspaper web offset printing where high printing durability is required. 85

L'invention concerne une plaque lithographique à sec se composant d'un support sur lequel sont empilées dans l'ordre suivant une couche photosensible et une couche de caoutchouc aux silicones. La couche photosensible contient soit un produit issu de la réaction d'un composé comprenant au moins un groupe hydroxyle phénolique et au moins un groupe hydroxyle non phénolique avec un composé de quinone diazide, ou l'ensemble de deux produits issus, l'un de la réaction d'un composé comprenant au moins un groupe hydroxyle phénolique avec au moins un composé de quinone diazide, l'autre de la réaction d'un composé comprenant au moins un groupe hydroxyle non phénolique avec un composé de quinone diazide. Cette plaque est caractérisée par une excellente aptitude à reproduire l'image, par une usure de plaque qui convient à l'utilisation sur les rotatives offset utilisées en imprimerie de labeur ou de presse où l'usure des plaques est rapide, ce qui est intéressant d'un point de vue économique.

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