Positive-working photosensitive lithographic printing plate...

B - Operations – Transporting – 41 – C

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B41C 1/10 (2006.01) B41M 5/36 (2006.01)

Patent

CA 2349307

A positive photosensitive printing plate is prepared wherein the photosensitivy is to near-infrared rays which do not induce a chemical change in a photosensitive component. The photosensitive material has an inclined structure from the viewpoint of dissolution of the irradiated portion in an alkali developer. The dissolution rate is such that it continuously increases from the upper, surface part of the photosensitive material to the lower part of the photosensitive material. This effect may be enhanced by diffusion of a material, preferably a polar compound, such as H2O, from the surface toward the inner lower part of the photosensitive material. Techniques for accomplishing the diffusion include contacting the surface of the photosensitive material with an atmosphere of high humidity or overlaying the photosensitive material with a layer of protective material (paper) containing moisture and heating the resultant composite. The photosensitive material may include a solubility suppressing agent such as a sulfonic acid ester or a compound having a triarylmethane skeleton.

On prépare une plaque d'impression photosensible positive dont la photosensibilité concerne les rayons de l'infrarouge proche qui ne provoquent pas de changement chimique dans un constituant photosensible. Le matériau photosensible possède une structure inclinée du point de vue de la dissolution de la partie irradiée dans un révélateur alcalin. Le taux de dissolution est tel qu'il augmente en continu depuis la partie de surface supérieure du matériau photosensible jusqu'à la partie inférieure du matériau photosensible. Cet effet peut être accru par diffusion d'un matériau, de préférence un composé polaire, tel que H¿2?O, à partir de la surface en direction de la partie inférieure interne du matériau photosensible. Des techniques de réalisation de la diffusion consistent à placer la surface du matériau photosensible en contact avec un milieu très humide ou à recouvrir le matériau photosensible avec une couche d'un matériau protecteur (du papier) contenant de l'humidité, et à chauffer le composite qui en résulte. Le matériau photosensible peut renfermer un agent supprimant la solubilité, tel qu'un ester d'acide sulfonique ou un composé ayant un squelette triarylméthane.

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