Water based ink

A water-based ink comprising a water dispersion of polymer particles including at least polymer particles A of a yellow pigment-containing water insoluble vinyl polymer A and polymer particles B of a pigment-free water insoluble vinyl polymer B, wherein the water insoluble vinyl polymer A is a polymer produced by polymerizing a monomer composition A containing

• [1] a polyoxyalkylene group-containing monomer,
• [2] a salt forming group-containing monomer, and
• [3] a monomer copolymerizable with the polyoxyalkylene group-containing monomer and the salt forming group-containing monomer,
• the water insoluble vinyl polymer B is a polymer produced by polymerizing a monomer composition B containing
• [4] a styrene monomer and
• [5] a plurality of monomers copolymerizable with the styrene monomer, and has a minimum film forming temperature of 20° C. or above, and
• the polymer particles B have an average particle diameter of 30 to 60 nm, wherein the polymer particles A are present in the water-based ink in an amount effective to enhance storage stability of the water-based ink, to improve recovery from clogging of a nozzle through with the water-based ink is ejected and/or to improve stability of printing with the water based ink as compared with the water-based ink without the polymer particles A, wherein the polymer particles B are present in the water-based ink in an amount effective to improve fixation of the water-based ink on gloss paper as compared with the water-based ink without the polymer particles B, and wherein the plurality of monomers copolymerizable with the styrene monomer comprise a (meth)acrylic ester, an unsaturated amide compound, a monomer having two or more polymerizable double bonds in one molecule and an unsaturated carboxylic acid.

A water-based ink comprising a water dispersion of polymer particles including at least polymer particles A of a yellow pigment-containing water insoluble vinyl polymer A and polymer particles B of a pigment-free water insoluble vinyl polymer B, wherein the water insoluble vinyl polymer A is a polymer produced by polymerizing a monomer composition A containing

• [1] a polyoxyalkylene group-containing monomer,
• [2] a salt forming group-containing monomer, and
• [3] a monomer copolymerizable with the polyoxyalkylene group-containing monomer and the salt forming group-containing monomer,
• the water insoluble vinyl polymer B is a polymer produced by polymerizing a monomer composition B containing
• [4] a styrene monomer and
• [5] a plurality of monomers copolymerizable with the styrene monomer, and has a minimum film forming temperature of 20° C. or above, wherein the plurality of monomers copolymerizable with the styrene monomer comprise a (meth)acrylic ester, an unsaturated amide compound, a monomer having two or more polymerizable double bonds in one molecule and an unsaturated carboxylic acid;
• wherein the polymer particles B have an average particle diameter of 30 to 60 nm, wherein the polymer particles A are present in the water-based ink in an amount effective to enhance storage stability of the water-based ink, to improve recovery from clogging of a nozzle through with the water-based ink is ejected and/or to improve stability of printing with the water based ink as compared with the water-based ink without the polymer particles A, and wherein the polymer particles B are present in the water-based ink in an amount effective to improve fixation of the water-based ink on gloss paper as compared with the water-based ink without the polymer particles B and to improve stability of printing as compared with the water-based ink with polymer particles B that do not comprise all of the plurality of monomers.