Production of relief plates and printing plates by a...

Details Production of relief plates and printing plates by a... Production of relief plates and printing plates by a...

G - Physics

03

F

96/251

G03F 7/26 (2006.01) G03F 7/031 (2006.01) G03F 7/105 (2006.01)

Patent

CA 1261192

- 34 - Abstract of the Disclosure: Relief plates and printing plates are produced by a positive-working process, using a photo- polymerizable layer which contains one or more photopoly- merizable, olefinically unsaturated compounds, one or more photoinitiators which can be activated by UV light, and a combination of a phenothiazinium, phenoxazinium, phenazin- ium or acridinium dye wiht a mild reducing agent which, on exposure to visible light, is capable of reducing the dye in the excited electronic state. The photopolymeriz- able layer is exposed imagewise to light having a wavelength longer than 450 nm, and simultaneously or subsequently exposed uniformly to light having a wavelength of from 300 to 420 nm, after which the unpolymerized areas of the layer are removed.

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