Gumming solution for use in the burning-in of offset-...

Details Gumming solution for use in the burning-in of offset-... Gumming solution for use in the burning-in of offset-...

G - Physics

03

F

96/219, 96/71

G03F 7/26 (2006.01) B41N 3/08 (2006.01) G03F 7/40 (2006.01)

Patent

CA 1266196

ABSTRACT OF THE DISCLOSURE A gumming solution is disclosed for use in the burning-in of irradiated and developed offset-printing plates. The gumming solution contains (a) water, (b) at least one hydrophilic polymer, and (c) at least one component derived from an organic acid. Component (b) comprises, for example, N-polyvinyl-pyrrolidone-(2) or polyacrylic acid, and component (c) comprises a water- soluble organic carboxylic acid, sulfonic acid, or phosphonic acid which has at least two acid functions and which is selected from the group consisting of ben- zene carboxylic acids, benzene sulfonic acids, benzene phosphonic acids, and alkane phosphonic acids, or one of the salts thereof (for example, disodium-benzene- 1,3-disulfonate, mellitic acid, or methane-diphosphonic acid.) A process for the production of an offset- printing plate, using the aforesaid gumming solution in the burning-in of the plate, is also disclosed. With application of this gumming solution, washing of the printing plate prior to printing is rendered unneces- sary, since the printing plate runs clean very rapidly during the printing process. -0-

477086

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