Dampening water composition for lithographic plate.

摘要

The present invention relates to a concentrated dampening water for a lithographic printing plate characterized by comprising: (a) 0.5 to 50% by weight of, as a nonionic surfactant, at least one compound selected from the group consisting of ethylene oxide and/or propylene oxide adduct of 2-ethyl-1,3-hexanediol and ethylene oxide and/or propylene oxide adduct of acetylene alcohol or acetylene glycol, (b) 1 to 30% by weight of 4-hydroxy-4-methyl-2-pentanone and/or a compound of the following formula [I], [III] or [III]: <CHEM> wherein R represents a methyl group, an ethyl group, a propyl group or a butyl group, and (c) 30 to 75% by weight of water. According to the present invention, an excellent concentrated dampening water is obtained, which has substantially no toxicity; does not pollute the working environment and causes no fire; necessitates no local exhaust device; and is excellent from the viewpoints of fouling of the metering roll, bleeding, emulsifiability, stability for continuous operation and anti-foaming property. Thus, with the concentrated dampening water of the present invention, the stable printing is possible.