Preparation of relief printing plates

Details Preparation of relief printing plates Preparation of relief printing plates

G - Physics

03

F

96/257

G03F 7/32 (2006.01)

Patent

CA 1334139

The present invention relates to an improved process for preparing a photopolymerized flexographic relief printing plate or a photoresist from a photosensitive element comprising a photopolymerizable layer consisting essentially of at least one polymer as the binder; at least one photopolymerizable monomer compatible with the binder; and one photoinitiator, by imagewise exposing the photopolymerizable layer of the element to actinic light and washing out the unexposed, non-photopolymerized parts of the layer with a developer, thereby obtaining a photopolymerized flexographic relief printing plate or a photoresist. The improvement of the process comprises: washing out the non- photopolymerized parts of the irradiated photopolymerizable layer with the developer which consists essentially of at least one hydrogenated petroleum fraction having a flashpoint above 45°C and a boiling range of from 160 to 220°C, 0 to 2% by weight, based on the developer, of at least one surface active compound and 0 to 10% by weight, based on the developer, of a monoterpene. In a preferred embodiment the improved process makes use of a developer which contains, in addition to the abovementioned components, 5 to 20 vol. %, based on the developer, of an alcohol selected from the group consisting of alcohols with 4 to 8 carbon atoms.

598578

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