| abstract |
A new emulsion aqueous solution which can be used as a film-forming binder suitable for an inkjet printing system. An AB block copolymer comprising a polymer I and a polymer II mixed together and comprising a methacrylate monomer having a polymer I of 90% or more, neutralized with an alkali, the A chain is substantially insoluble in water, An average molecular weight of 1,000 to 10,000 and a dispersity of 1.5 or less and an acid value of 30 to 250 mgKOH / g of a B chain synthesized with a monomer containing methacrylic acid, and the AB block copolymer has a number average molecular weight The polymer A is a polymer having a Tg of 70 DEG C or lower which is obtained by polymerizing an addition polymerizable monomer having hydrophilicity, Also, an emulsion aqueous solution having a mass ratio of Polymer I and Polymer II of 5 to 80: 95 to 20. |