Shallow relief non-bottoming photopolymer printing plate
AssigneeNapp Systems (USA), Inc.
InventorsRobert W. Hallman, Koichi Kimoto, Sakuo Okai
Life of this patent
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Abstract
A shallow relief non-bottoming printing plate is disclosed having a polymerized layer of less than about 0.020 inch and which includes a plurality of dispersed particles sufficient to create small protuberances in non-image or background areas to prevent bottoming. Photopolymerizable elements, as well as processing techniques, are also disclosed for making such printing plates.
Claims5
A shallow relief, non-bottoming printing plate comprising a water-developable photopolymerized layer having a thickness less than 0.020 inch and supported on a substrate, and a binder layer having a thickness from about 5 to 60 microns and carrying a plurality of dispersed ink repellant, polytetrafluroethylene particles interposed between said substrate and said photopolymerized layer, said binder layer being selected from the group consisting of (a) styrene-butadiene copolymers, (b) polyesters, (c) glyoxal, or mixtures of (a), (b), or (c), with partially hydrolyzed polyvinyl acetate, said photopolymerized layer having raised image areas and recessed background areas, and said dispersed particles being present in said binder layer in a size and concentration sufficient to create an array of protuberances in the background areas having an average height between about 5 to 70 microns and an average distance between protuberances of about 5 to 1000 microns.
A shallow relief, non-bottoming printing plate comprising a water-developable photopolymerized layer having a thickness less than 0.020 inch and supported on a substrate, and a binder layer having a thickness from about 5 to 60 microns and carrying a plurality of dispersed ink repellant particles interposed between said substrate and said photopolymerized layer, said photopolymerized layer having raised image areas and recessed background areas;
- said dispersed particles being present in said binder layer in a size and concentration sufficient to create an array of protuberances in the background areas of said plate having an average height between about 5 to 70 microns and an average distance between protruberances of between about 5 to 1000 microns;
- and
- said binder layer being selected from the group consisting of (a) styrene-butadiene copolymers, (b) polyesters, (c) glyoxal, or mixtures of (a), (b), or (c), with partially hydrolyzed polyvinyl acetate, said binder layer also having one or more antihalation compositions uniformly dispersed throughout.
Dependencies are inferred from the claim text.