Abstract:
Photosensitive coating materials comprising polymers containing o-nitrocarbinol ester groups, particularly of polymers and copolymers of o-nitrocarbinol esters of ethylenically unsaturated carboxylic acids, which as a result of exposure become soluble in an alkaline solvent used as developer in which they were not soluble prior to exposure. Such materials are used in particular for coating lithographic printing plates and as photoresists.
Abstract:
The invention relates to a process for the manufacture of a makeready foil for relief printing. A multilayer sheet consisting of a dimensionally stable base which transmits acting light; a non-photopolymerizable intermediate layer which is soluble in solvents and absorbs actinic light; and a photopolymerizable layer which contains a compound capable of absorbing actinic light, is exposed through a negative from the base side and the unexposed portions of the photopolymerizable layer and of the intermediate layer are washed out with a solvent from the photopolymerizable-layer side. The makeready foil of the invention greatly simplifies the makeready process for the printer.
Abstract:
A process for the production of gravure printing plates by exposing through a continuous tone positive a layer of a photocrosslinkable material that is soluble in a developer solution but which becomes sparingly soluble or insoluble in said solution after exposure, which layer has been applied to a dimensionally stable substrate, subsequently laminating the exposed layer to a base so that the side originally facing the positive faces the base, re-exposing said laminated layer through a screen and washing out the non-crosslinked areas with the developer solution from the rear side. Tonally correct gravure printing plates based on plastics materials can be advantageously obtained by the process of the invention.