AQUEOUS COATING AGENT

摘要

[PROBLEMS] To provide an aqueous coating agent which can be coated on a recording medium in an ink-jet mode and enables to form a film having excellent scratch resistance, water resistance and gloss on the image surface, and also provide an aqueous coating solution comprising the coating agent. [MEANS FOR SOLVING PROBLEMS] An aqueous coating agent for pigment ink-jet, comprising a graft copolymer having a silicone side chain and, as the main chain, a copolymer essentially composed of a monomer containing an ethylenically unsaturated carboxylic acid, and having an acid value of 40 to 200 mg-KOH/g (solid) and a weight average molecular weight of 5,000 to 30,000; and an aqueous coating solution for pigment ink-jet, which comprises an aqueous coating agent comprising the graft copolymer and which is intended to be charged in a tank different from one for a pigment ink in an ink-jet mode, to be ejected from a separate nozzle and to be coated on a recorded article.