USE OF POLYMERS CONTAINING AMINO GROUPS MODIFIED WITH ACID GROUPS TO OBTAIN FOUNTAIN SOLUTIONS OR CONCENTRATES OF FOUNTAIN SOLUTIONS, AS WELL AS IN CIRCULATING FOUNTAIN SOLUTIONS FOR OFFSET PRINTING Russian patent published in 2010 - IPC C08G73/02 B41N3/08 B41F7/04 B41M1/06 

FIELD: chemistry.

SUBSTANCE: invention relates to use of polymers as a wetting agent in offset printing. The wetting agent contains at least one polymer P, which is a product of reacting polyethyleneimine with a cross-linking agent obtained by reacting polyethylene glycol with molecular weight 1500 with epichlorohydrin, and acrylic acid and contains amino groups modified with a -CH₂CH₂COOH group and/or its salts. Described also is an offset printing method which uses the said wetting agent.

EFFECT: wetting agent ensures formation on non-printing parts of the printing plate of a stable water film which prevents movement of printing ink to the said parts during printing.

9 cl, 2 tbl, 1 ex