Patent ID: 8065958

Claim:
A process for printing by means of the offset technique comprising the steps of: (a) mounting an offset printing plate on a printing cylinder; (b) causing said printing cylinder to rotate; (c) transferring fountain solution to said printing plate with the aid of a dampening unit; (d) transferring printing ink to said printing plate with the aid of an inking unit; (e) transferring said printing ink from said printing plate to a rotating rubber blanket cylinder touching said printing plate; (f) transferring said printing ink from said rubber blanket cylinder to a print medium transported past a printing cylinder and in contact therewith; wherein said fountain solution comprises water and at least one polymer P, which comprises amino groups modified with acid groups, and wherein said amino groups modified with acid groups are selected from the group consisting of structural units of general formulae I, II, and III: wherein R 1 is H or a straight-chain or branched hydrocarbon radical; and Z is a group of the general formula —XR 2 n , wherein X is a n-valent organic radical, n is a natural number greater than or equal to 1, and R 2 is a group selected from the group consisting of —COOH and salts of —COOH.