Toyo Ink Sc Holdings Co., Ltd.

Toyocolor Co., Ltd

Toshihiro Tetsuka

Masahiro Sugihara

Tomoe Tanabe

Yuki Sasaki

Takaaki Koike

Kazumasa Hattori

Akiko Imazato

Naoya Kikuta

A pretreatment liquid that is used together with an aqueous inkjet ink containing a pigment and water, wherein the pretreatment liquid contains resin microparticles (A), a surfactant (B), a coagulant (C) and water, the surfactant (B) contains a polyoxyalkylene alkyl ether (b-1), and the coagulant (C) contains a polyvalent metal salt and/or a cationic polymer compound and has a water absorptivity at a temperature of 40&#xb0; C. and a relative humidity of 80% of 75% by mass or less.

Pretreatment liquid and ink set

Provided is a pretreatment liquid for aqueous pigment inkjet printing which excels in adhesion to non-permeable substrates such as film substrates and which can provide printed material having good printed image quality with little mixed color bleeding and color unevenness. Also provided is an ink set including the pretreatment liquid and an aqueous pigment inkjet ink. The pretreatment liquid for aqueous pigment inkjet ink printing comprises polyolefin resin particles (A), a flocculant (B), and water. The softening temperature of the polyolefin resin particles (A) is from 50 to 100&#xb0; C., and the flocculant (B) contains at least one type of substance selected from metal salts and cationic polymer compounds.

Pretreatment liquid and ink set comprising same

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Tokyo, Japan

Toshihiro Tetsuka