Digital laser imagable lithographic printing plates

G - Physics – 03 – F

Patent

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Details

G03F 7/09 (2006.01) B41C 1/10 (2006.01) G03F 1/00 (2006.01) G03F 7/075 (2006.01) G03F 7/12 (2006.01)

Patent

CA 2198208

Lithographic printing plates for wet or waterless offset printing are disclosed which can be imagewise exposed using a digitally controlled IR laser. The invention comprises a laser imagable lithographic printing plate comprising a substrate, a photosensitive coating on the substrate, and a water soluble laser ablatable top coating containing dyes or polymers that absorb infrared, ultra violet and visible light. Laminated transparent polymer films and/or peelable polymeric coatings films can be interposed between the coated substrate and a water soluble and/or organic solvent soluble laser ablatable top layer to augment plate production or image inscription on the plate.

La présente invention concerne des plaques lithographiques pour impression offset humide ou sèche, qui peuvent être exposées en vue de former une image à l'aide d'un laser infrarouge à commande numérique. L'invention comprend une plaque d'impression lithographique à formation d'image par laser, ladite plaque comportant un substrat, un revêtement photosensible recouvrant le substrat, un revêtement supérieur capable d'être enlevé par laser et hydrosoluble, contenant des colorants ou des polymères qui absorbent les infrarouges, les ultraviolets et la lumière visible. Il est possible d'intercaler entre le substrat avec revêtement et une couche supérieure capable d'être enlevée par laser et soluble dans l'eau et/ou dans un solvant organique des films polymères transparents stratifiés et/ou des films de revêtement polymères pelables, afin d'accroître la production des plaques et la gravure de l'image sur la plaque.

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