LITHOGRAPHIC PRINTING PLATES AND PHOTORESISTS COMPRISING A PHOTOSENSITIVE POLYMER
First Claim
1. A LITHOGRAPHIC PRINTING PLATE COMPRISING A SUPPORT AND A LAYER OF A PHOTOSENSITIVE COATING MATERIAL ON SAID SUPPORT, SAID MATERIAL CONSISTING ESSENTIALLY OF A POLYMER HAVING A MOLECULAR WEIGHT OF MORE THAN 500 AND CONTAINING IN THE MOLECULE SUCH AN AMOUNT BUT AT LEAST 5% BY WEIGHT, WITH REFERENCE TO THE MOLECULAR WEIGHT, OF AROMATIC OR HETEROAROMATIC ONITROCARBINOL ESTER GROUPS OF THE FORMULA I:
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Accused Products
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.
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Citations
2 Claims
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1. A LITHOGRAPHIC PRINTING PLATE COMPRISING A SUPPORT AND A LAYER OF A PHOTOSENSITIVE COATING MATERIAL ON SAID SUPPORT, SAID MATERIAL CONSISTING ESSENTIALLY OF A POLYMER HAVING A MOLECULAR WEIGHT OF MORE THAN 500 AND CONTAINING IN THE MOLECULE SUCH AN AMOUNT BUT AT LEAST 5% BY WEIGHT, WITH REFERENCE TO THE MOLECULAR WEIGHT, OF AROMATIC OR HETEROAROMATIC ONITROCARBINOL ESTER GROUPS OF THE FORMULA I:
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2. A photoresist comprising a substrate to be etched to which has been applied a photosensitive coating material consisting essentially of A polymer having a molecular weight of more than 500 and containing in the molecule such an amount but at least 5% by weight, with reference to the molecular weight, of aromatic or heteroaromatic o-nitrocarbinol ester groups of the formula I:
Specification