PICTURE ERASING AGENT FOR PLANOGRAPHIC PRINTING PLATE

PURPOSE:To erase an unnecessary picture, on a planographic printing plate, which has a photosensitive layer containing a photo-cross-linking polymer and a photopolymerizing polymer, by using an erasing agent which contains an organic solvent and alkali hydroxide without leaving bleeding at a place e...

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Bibliographische Detailangaben
Hauptverfasser:	IDE KOUJI, FUKUZAWA CHISAKO, SHIMIZU SHIGEKI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY LINING MACHINES MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING,INKING, DAMPING, OR THE LIKE MATERIALS THEREFOR ORIGINALS THEREFOR PERFORMING OPERATIONS PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHYSICS PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM PRINTING PRINTING PLATES OR FOILS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	PURPOSE:To erase an unnecessary picture, on a planographic printing plate, which has a photosensitive layer containing a photo-cross-linking polymer and a photopolymerizing polymer, by using an erasing agent which contains an organic solvent and alkali hydroxide without leaving bleeding at a place except at an erasure place and corroding a base. CONSTITUTION:A 50-99wt% organic solvent of alkali hydroxide, such as KOH and NaOH, and a kind of ketone, a kind of ester, aromatic hydrocarbon, etc., specially, univalent alcohol or benzine alcohol of C6-10 is mixed, and a small quantity of a surface active agent, a thickener, etc., are added to prepare an erasing agent. An unnecessary picture part, such as a flaw and an edge, on a photosensitive planographic printing plate which has a photosensitive layer containing a photo-cross-linking or photopolymerizing polymer, such as a photosensitive polymer, having cinnamic acid at a principal or side chain is applied with the said erasing agent with a painting brush and, after being left for a while, washed away. Thus, excellent erasure is performed without corroding a base and causing bleeding in an adjacent picture at the unnecessary picture part.