Photosensitive compositions and clean running photopolymer...

G - Physics – 03 – F

Patent

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Details

G03F 7/028 (2006.01) B41M 1/04 (2006.01) G03F 7/027 (2006.01) G03F 7/26 (2006.01)

Patent

CA 2207591

Clean running printing plates for flexographic printing may be prepared by the co-photopolymerization of a mixture comprising a liquid, acrylate or methacrylate-terminated polyurethane oligomer, an ethylenically unsatured compound, and a photopolymerization initiator. The liquid oligomer is preferably the acrylated or methacrylated reaction product of a diisocyanate, a liquid hydrophobic polyalkylene oxide, and a diol that is at least one of polypropylene oxide and a copolymer of ethylene oxide and propylene oxide, where reaction with a hydroxy-containing acrylate or methacrylate compound incorporates terminal acrylate or methycrylate groups into the oligomer. The photopolymerizable blend may be used to form printing plates for flexographic printing, where the plates have a reduced tendency to pick up paper fibers, dust and dried ink during the printing process. Methodology for preparing the printing plates, and printing with the printing plates of the invention is also provided.

On peut préparer des plaques d'impression pour impression flexographique, fonctionnant dans des conditions de grande propreté, par la cophotopolymérisation d'un mélange comportant un liquide, un oligomère de polyuréthane terminé par un groupe acrylate ou méthacrylate, un composé à insaturations éthyléniques et un initiateur de photopolymérisation. L'oligomère liquide est de préférence le produit de réaction acrylaté ou méthacrylaté d'un diisocyanate, d'un oxyde de polyalkylène hydrophobe liquide et d'un des diols suivant : oxyde de polypropylène, ou copolymère d'oxyde d'éthylène et d'oxyde de propylène, et une réaction avec un composé acrylate ou méthacrylate contenant un groupe hydroxyle incorpore dans l'oligomère des groupes terminaux acrylate ou méthycrylate. Le mélange photopolymérisable peut servir à la fabrication de plaques de tirage pour impression flexographique, caractérisées par une réduction de l'accumulation des fibres de papier, de la poussière et de l'encre sèche en cours d'impression. L'invention porte aussi sur la méthodologie utilisée pour la préparation des plaques de tirage, ainsi que pour l'impression avec ces plaques.

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