Positive-working radiation-sensitive imageable elements

A positive-working imageable element comprising a substrate having thereon an imageable layer comprising a water-insoluble polymeric binder, and a radiation absorbing compound,

• wherein the polymeric binder comprises:
• a) vinyl acetal recurring units comprising pendant hydroxyaryl groups, and
• b) recurring units comprising hydroxyaryl ester groups that are substituted with a cyclic imide group,
• wherein the vinyl acetal recurring units comprising pendant hydroxyaryl groups and the recurring units comprising hydroxyaryl ester groups that are substituted with a cyclic imide group are independently present in the polymeric binder in an amount of at least 10 mol % and 25 mol %, respectively, all based on the total recurring units in the polymeric binder.