Riso Kagaku Corporation

Satoshi Aoki

Yoshifumi Watanabe

Manami Shimizu

Hiroyuki Ogawa

Ami Terakado

Kyoko Motoyama

Kazunori Ohashi

An oily inkjet ink comprises a pigment, a pigment dispersant, and a solvent, wherein the solvent contains a hydrocarbon type solvent (A), a solvent (B) having at least an ester group and an ether group in one molecule, and a solvent (C) that is soluble in the hydrocarbon type solvent and the solvent having at least an ester group and an ether group in one molecule.

Oily inkjet ink

A printing method is provided, wherein the printing method including: printing an ink, having a total surface free energy &#x3b3; calculated from the Kaelble-Uy theoretical formula of 25 to 30 mN/m, and a dispersive component ratio &#x3b3;dr represented by a formula (1) shown below of 0.55 to 0.75, onto a recording medium, and transporting the recording medium using a transport member that opposes at least a printed surface of the printed recording medium, wherein the transport member has a total surface free energy &#x3b3; calculated from the Kaelble-Uy theoretical formula of 20 mN/m or less, and a dispersive component ratio &#x3b3;dr represented by the formula (1) shown below of 0.75 to 1.00: &#x3b3;dr=&#x3b3;d/&#x3b3; (1), wherein &#x3b3;dr represents the dispersive component ratio, &#x3b3;d represents a surface free energy of as dispersive component, and &#x3b3; represents the total surface free energy.

Printing method and transport member

A method for printing a non-aqueous ink onto a printing substrate, using a non-aqueous ink including a coloring material and a non-aqueous solvent is provided, wherein the non-aqueous ink has a total surface free energy, calculated from the Kaelble-Uy theoretical formula, of 25 to 30 mN/m, and a dispersive component ratio of 0.55 to 0.75, and the printing substrate has a coating layer containing inorganic particles, has a total surface free energy, calculated from the Kaelble-Uy theoretical formula, of 30 to 50 mN/m, has a dispersive component ratio of 0.80 to 1.0, and exhibits a liquid absorption property for the inorganic particles of 0.30 or greater. The method for printing a non-aqueous ink enables roller transfer staining to be suppressed while maintaining high image density.

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Ibaraki-ken, Japan

Satoshi Aoki