Toyo Ink Sc Holdings Co., Ltd.

Toyocolor Co., Ltd

Toyo Ink Co., Ltd.

Kazumasa Hattori

Masahiro Sugihara

Toshihiro Tetsuka

Yuji Soneta

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

An embodiment of the present invention relates to a polymeric dispersant for a liquid developer, which is obtained by copolymerizing at least an ethylenically unsaturated monomer having an amino group, an ethylenically unsaturated monomer having an alkyl group with a carbon number of 9 to 24, and an ethylenically unsaturated monomer represented by general formula (1) shown below:CH&#x2550;C(R)COO(AO)R&#x2003;&#x2003;General formula (1)wherein, Rrepresents H or CH, Rrepresents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 22, n represents an integer of 1 to 200, and A represents an alkylene group having a carbon number of 2 to 4.

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Tokyo, Japan

Kazumasa Hattori