Photosensitive compositions and their use in lithographic plates

摘要

This invention relates to a photosensitive composition, comprising: (A) a diazonium polycondensation product or a free radical polymerizable system consisting of photo initiators and unsaturated compounds which are free radical polymerizable or a hybrid system consisting of a diazonium polycondensation product and a free radical polymerizable system consisting of photo initiators and unsaturated compounds which are free radical polymerizable, (B) a binder and optionally one or more exposure indicator(s), one or more dye(s) for increasing the contrast of the image as well as one or more acid(s) for stabilizing the photosensitive composition. The binder is a reaction product of a carboxyl-groups containing polymer of formula (I) P-(-X-COOH)n wherein P is a polymer, n is an integer and X is a single bond or a spacer group, with one or more different 2-oxazoline(s) of the formula (II) wherein R is alkyl, aryl, aralkyl, alkoxy, aryloxy or aralkyloxy and R' and R'' are independently hydrogen, alkyl or aryl and wherein 5 to 100 mole % of the carboxyl groups can be reacted.