Production relief copies by subjecting an exposed photosensitive layer to ultrasonic treatment

Abstract From the Canadian patent

A process for producing relief copies wherein the light-hardenable layer of a lighthardenable copying material, which contains a photopolymerizable mixture, a photodimerizable polymeric compound or a diazonium salt polycondensation product is exposed to a light image, the exposed layer is subjected to a brief ultrasonic treatment and the unex-, posed areas of the layer are thereafter washed away by means of a developer. As a result of the ultrasonic treatment, shorter exposure times may be used and better in-depth hardening of the layer may be achieved.