| 摘要 |
PURPOSE:To obtain a treating liquid free of the possibility of precipitation of crystals in an apparatus and capable of maintaining a capability of imparting hydrophilic nature for a long time, by incorporating at least one copolymer containing at least one each of two kinds of specific repeating units and at least one specific compound. CONSTITUTION:A treating liquid for planography contains at least one copolymer containing at least one each of repeating units of general formulas (I) and (II) and at least one compound of general formula (III). The copolymer can be obtained by, for example, a method in which a copolymer of a monomer corresponding to the component of general formula (I) with maleic anhydride is subjected to hydrolysis or alcoholysis. The weight ratio of the repeating unit of general formula (I) to the repeating unit of general formula (II) in the copolymer thus obtained is preferably in the range of 9:1-5:5. The compound of general formula (III) is preferably used in an amount of 0.001-5 Wt.%. The treating liquid has excellent performance of preventing generation of crystals, scum, precipitation or the like, and a printed matter obtained by use of the treating liquid has excellent performance as to ink build-up properties and ground contamination. |
