Toyocolor Co., Ltd

Artience Co., Ltd.

Kazushi Sunaoshi

Takanori Nomura

Riho Morita

Masahiro Sugihara

Norio Suzuki

Yuki Sasaki

An embodiment of the present invention relates to an aqueous inkjet ink containing a pigment, a binder resin, a water-soluble organic solvent, an unmodified acetylene diol-based surfactant (A1), and an alkylene oxide-modified acetylene diol-based surfactant (A2) having an HLB value of 4 to 10, wherein contents of the unmodified acetylene diol-based surfactant (A1) and the alkylene oxide-modified acetylene diol-based surfactant (A2) are defined, and a ratio between the content of the unmodified acetylene diol-based surfactant (A1) and the content of the alkylene oxide-modified acetylene diol-based surfactant (A2) is 10 to 5,000.

Aqueous inkjet ink and printed matter

Provided is a pretreatment liquid comprising resin particles (A), calcium ions, plural types of carboxylate ions including at least a hydroxycarboxylate ion, and water. The resin particles A include resin particles (A1) selected from the group consisting of (meth)acrylic resin particles, urethane (urea) resin particles, and urethane-(meth)acrylic resin particles and having a solubility parameter (SP) value of from 9.0 to 13.5 (cal/cm), and a ratio of the amount of the resin particles (A) to an amount of the calcium ions in millimoles is specified. Also provided are an ink set containing the pretreatment liquid and a water-based inkjet ink, and a printed matter produced using the ink set.

Pretreatment liquid, ink set, and printed matter

An aqueous inkjet ink containing a pigment, a binder resin, a water-soluble organic solvent, a surfactant and water, wherein the binder resin contains, as structural units, an aqueous resin containing a structure derived from an ethylenically unsaturated monomer containing an acid group and a structure derived from an ethylenically unsaturated monomer containing a hydroxyl group, the resin has a weight average molecular weight of 5,000 to 45,000, and a glass transition temperature of 35 to 110° C., the water-soluble organic solvent contains a first water-soluble organic solvent having an SP value of 8.5 to 13 (cal/cm), and does not contain a second water-soluble organic solvent having a boiling point at 1 atmosphere of 235° C. or higher, and the surfactant contains an acetylene-based surfactant.

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Tokyo, Japan

Kazushi Sunaoshi