Photopolymerizable mixture and photopolymerizable copying material produced therewith

摘要

A photopolymerizable mixture is described which contains a polymeric binder, a compound which is polymerizable by a free radical mechanism and has at least two ethylenically unsaturated polymerizable groups, a photoinitiator, and additionally contains a disulfide compound of the formula R1-CH2-S-S-CH2-R2 in which R1 and R2 are identical or different and are alkyl, cycloalkyl, aryl, aralkyl or N-substituted carbamoyl or carbamoylalkyl groups. When applied as a photopolymerizable layer to a layer support, the mixture has a low sensitivity to atmospheric oxygen. Covering of the layer by oxygen-inhibiting cover sheets or cover layers is not required.