Uv-absorbing support layers and flexographic printing...

G - Physics – 03 – F

Patent

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Details

G03F 7/095 (2006.01) G03C 1/76 (2006.01) G03F 1/00 (2006.01) G03F 7/029 (2006.01) G03F 7/09 (2006.01) G03F 7/11 (2006.01)

Patent

CA 2387424

The present invention provides a method for producing direct-imaged flexographic printing elements such that both the front and back exposure times are economically efficient for the manufacturer. In one embodiment, the method comprises providing at least one solid photocurable element. The solid photocurable element comprises a solid photocurable material comprising an oxygen scavenger, a support layer having an actinic radiation absorbing compound integrated uniformly throughout such that is absorbs at least some actinic radiation during exposure, and a photoablative mask layer. The methods of the invention involve creating a floor in the solid photocurable material by back exposure through the support layer having the actinic radiation absorbing compound, transferring a negative image directly onto the solid photocurable material by photoablating the photoablatable mask layer, followed by front exposure effective to cure the solid photocurable material.

La présente invention porte sur un procédé de production d'éléments d'impression flexographiques par image directe de sorte que les deux temps d'exposition de face et à blanc soient efficaces d'un point de vue économique pour le fabricant. Selon une réalisation, le procédé consiste à produire au moins un élément solide photodurcissable comprenant un matériau photodurcissable solide renfermant un désoxygénant, une couche de support constituée d'un composé actinique absorbant les radiations et intégré de manière uniforme dans celle-ci de sorte qu'il absorbe au moins certaines radiations actiniques lors de l'exposition et une couche de masque photoablative. Les procédés de cette invention consistent à créer une base dans le matériau photodurcissable solide par exposition à blanc au moyen de la couche de support comprenant le composé absorbant les radiations actiniques, transférer une image négative directement sur le matériau photodurcissable solide par photoablation de la couche de masque, puis par exposition de face efficace pour durcir le matériau photodurcissable solide.

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