Patent ID: 6884557
Filing Date: 2005-04-26
Classification: B41N,G03G

Abstract:
1. A desensitizing treatment liquid for lithographic printing, which contains at least one compound represented by formula (III): wherein X represents an alkylene linkage group having from 3 to 10 carbon atoms or a cycloalkylene linkage group having from 3 to 10 carbon atoms, each group may be substituted and φ represents —OPO 3 H 2 , or a salt thereof, said compound being capable of chelating with zinc ion or titanium ion which is generated from a zinc oxide or titanium oxide existing on the surface of a lithographic printing plate by etching treatment to form a sparingly water-soluble precipitation; wherein the amount of the compound is 10 to 300 parts by weight per 1000 parts by weight of the desensitizing treatment liquid.