Patent ID: 7329482

Claim:
A dampening water for a lithographic printing which is prepared by dilution of a dampening water composition comprising an adduct compound of ethylene oxide and propylene oxide to ethylenediamine, which compound has a weight-average molecular weight of from 800 to 1200 and a molar ratio of added ethylene oxide and added propylene oxide ranging from 5:95 to 50:50, at least one selected from carboxymethylcellulose, hydroxypropylcellulose and polyvinylpyrrolidone, at least one selected from sugars, and a pH adjusting agent selected from organic acids, inorganic acids, and a salt thereof so that the dampening water has a pH value of from 3 to 6, said dampening water being substantially free of a volatile organic solvent, said dampening water comprising the adduct compound of ethylene oxide and propylene oxide to ethylenediamine in an amount of 0.01 to 1% by weight, said at least one selected from carboxymethylcellulose, hydroxypropylcellulose and polyvinylpyrrolidone in an amount of from 0.003 to 1% by weight, said at least one selected from sugars in an amount of from 0.01 to 1% by weight, and water in a predominant amount.