Negative-acting no-process printing plates

G - Physics – 03 – F

Patent

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Details

G03F 7/033 (2006.01) B41C 1/10 (2006.01) G03F 7/027 (2006.01) G03F 7/038 (2006.01)

Patent

CA 2218752

A photosensitive composition is prepared containing a polymer of the formula: B(X)(Y) wherein B represents an organic backbone, each X independently is an acidic group or salt thereof and each Y independently is a photocurable group and a photoinitiating compound or compounds. Preferably, free-radically polymerizable multi-functional monomer and/or oligomer is added to the photosensitive composition. The photosensitive composition can be coated on a suitable substrate for planographic printing plate applications. Imagewise irradiation causes the light struck regions to photocure, becoming insoluble in aqueous and organic mediums, while the non-light struck regions remain highly soluble/dispersable. Printing plates of this construction do not require processing prior to being run on a press.

On prépare une composition photosensible contenant un polymère de formule B(X)(Y) dans laquelle B représente un squelette organique, chaque X est séparément un groupe acide ou un sel de celui-ci et chaque Y est un groupe photodurcissable et un ou plusieurs composé photoamorceurs. On ajoute de préférence à la composition photosensible un polymère et/ou un monomère multifonctionnel(s) polymérisable(s) de manière radicalaire. La composition photosensible peut être appliquée sur un substrat approprié à des applications dans lesquelles on utilise une plaque d'impression planographique. L'irradiation par imagerie entraîne le photodurcissement des régions irradiées par la lumière, les rend insolubles dans des milieux aqueux et organiques, alors que les régions non irradiées par la lumière restent fortement solubles/dispersibles. Les plaques d'impression selon l'invention ne requièrent pas de traitement avant d'être exploitées sur une presse.

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