Toyo Ink Sc Holdings Co., Ltd.

Toyocolor Co., Ltd

Toyo Ink Co., Ltd.

Yoshihito Suzuki

Kazuhiro Jonai

Masahiro Sugihara

Mayuko Okamoto

Norio Suzuki

Atsushi Yoda

Masayoshi Utsugi

The invention provides a magenta ink for inkjet which yields distinct images having high gloss and no density irregularities or voids upon inkjet printing onto low-absorption substrates, exhibits excellent discharge stability after long standby periods, and can provide excellent drying properties even during high-speed printing; and also provides an ink set that can suppress mixed color bleeding and achieve superior color reproducibility.

Magenta ink for inkjet

One embodiment relates to an aqueous inkjet ink containing a pigment (A), a polymer compound (B), a water-soluble organic solvent (C) and a surfactant (D), wherein the water-soluble organic solvent (C) includes ethylene glycol and/or 1,3-propanediol (c1), and a water-soluble organic solvent (c2) having a specific static surface tension, the acid value of the polymer compound (B), the amount of water-soluble organic solvent having a boiling point at 1 atmosphere of 240&#xb0; C. or higher, and the weight average boiling point at 1 atmosphere for the water-soluble organic solvent (C) are all prescribed values, and the blend amounts of the various components satisfy specific relationships.

Aqueous inkjet ink and method for producing printed item

One embodiment relates to a water-based inkjet ink containing at least water, a pigment, a water-soluble organic solvent and a binder resin, wherein the water-soluble organic solvent contains at least a water-soluble organic solvent having a surface tension of 30 to 50 mN/m and a boiling point at 1 atmosphere of 180 to 230&#xb0; C., in an amount of 15 to 50% by weight relative to the total weight of the water-based inkjet ink, and the acid value of the binder resin is at least 5 mgKOH/g but less than 60 mgKOH/g.

Water-based inkjet ink and production method for printed matter

A water-based ink-jet which at least contains a pigment, a water-soluble organic solvent, and a surfactant (A), wherein the water-soluble organic solvent is a water-soluble organic solvent having an HLB value determined by Griffin's method of 8 or less, the water-soluble organic solvent being contained in an amount of 10-50 wt % with respect to the total weight of the water based ink-jet ink, and the surfactant (A) comprises an acetylenediol-based surfactant (a1) having an HLD value determined by Griffin's method of 3 or less.

Water-based inkjet ink

The present invention relates to an ink set for inkjet recording containing a white ink and color inks including a cyan ink, a magenta ink and a yellow ink, wherein each ink independently contains a pigment, a pigment dispersing resin, an organic solvent and water, the pigment dispersing resin A of either the white ink or the color inks has an alkyl chain with a carbon number of 10 or greater, the pigment dispersing resin B of the other of the white ink or the color inks has a polyoxyalkylene chain, and the pigment dispersing resin A and the pigment dispersing resin B are different resins. According to the present invention, an ink set for inkjet recording can be provided that exhibits excellent printability during high-speed printing, even when printing onto less permeable substrates, and is capable of producing sharp image quality with little mixed color bleeding.

Ink set for ink-jet recording

A pretreatment solution which is used together with an aqueous inkjet ink that contains at least a pigment, wherein the pretreatment solution contains an inorganic metal salt and/or an organic metal salt that exists in a dissolved state, and an organic solvent, the organic solvent contains a compound having one or more hydroxyl groups in each molecule, and the amount of the organic solvent is from 0.1 to 50% by weight based on the total weight of the pretreatment solution.

Growing community of inventors

Tokyo, Japan

Yoshihito Suzuki