GUMMING SOLUTION FOR USE IN THE BURNING-IN OF OFFSET- PRINTING PLATES AND PROCESS FOR THE PRODUCTION OF AN OFFSET-PRINTING PLATE

摘要

ABSTRACT OF THE DISCLOSUREA gumming solution is disclosed for use in theburning-in of irradiated and developed offset-printingplates. The gumming solution contains (a) water, (b)at least one hydrophilic polymer, and (c) at least onecomponent derived from an organic acid. Component (b)comprises, for example, N-polyvinyl-pyrrolidone-(2) orpolyacrylic acid, and component (c) comprises a water-soluble organic carboxylic acid, sulfonic acid, orphosphonic acid which has at least two acid functionsand which is selected from the group consisting of ben-zene carboxylic acids, benzene sulfonic acids, benzenephosphonic acids, and alkane phosphonic acids, or oneof the salts thereof (for example, disodium-benzene-1,3-disulfonate, mellitic acid, or methane-diphosphonicacid.) A process for the production of an offset-printing plate, using the aforesaid gumming solution inthe burning-in of the plate, is also disclosed. Withapplication of this gumming solution, washing of theprinting plate prior to printing is rendered unneces-sary, since the printing plate runs clean very rapidlyduring the printing process.-0-