Konica-Minolta Holdings, Inc.

Konica Corporation

Konica Minolta Ij Technologies, Inc.

Kenichi Ohkubo

Hirotaka Iijima

Yasuhiko Kawashima

Makoto Kaga

Teruyuki Fukuda

Hidetaka Ninomiya

Atsushi Tomotake

Manabu Kaneko

Tomomi Yoshizawa

Hisato Kato

Masayuki Ushiku

Yoshinori Tsubaki

Kumiko Furuno

A non-aqueous ink-jet ink containing a pigment, a resin for fixing an image and Compound A represented by Formula (1) or Formula (2), wherein a content of Compound A in the ink-jet ink is from 1.5 to 30 weight % based on the total weight of the ink-jet ink: 

Non-aqueous ink-jet ink and ink-jet recording method

An ink-jet ink comprising Component (A), Component (B), and Component (C), wherein a content of Component (A) is 20-60% by weight, a content of Component (B) is 10-50% by weight, and when the content of Component (A) is 100% by weight, the total content ratio of a class of glycol, a class of polyol, and glycerin is 0-20% by weight, and a surface tension of the ink-jet ink is 18-27 mN/m; wherein Component (A) is 1,3-dimethyl-2-imidazolidinone or &#x3b3;-butyrolactone, Component (B) is water, and Component (C) is a pigment.

Ink-jet ink and ink-jet recording method

A dispersion of colored particles is disclosed. The dispersion is prepared by emulsifying a mixture comprising a colorant and polymer, employing a reactive emulsifier, and subsequently copolymerizing the resulting mixture, employing polymerizable monomer. An ink employing the dispersion is also disclosed.

Colored minute particles dispersion, aqueous ink, and image forming method using the same

An ink for ink-jet recording containing: a colorant; and a solvent mixture containing water and solvent A which is not water, wherein solvent A has a surface tension of 25 to 40 mN/m at 25&#xb0; C.; a viscosity of 1 to 50 mPs&#xb7;s at 25&#xb0; C.; and a vapor pressure of not more than 133 Pa at 25&#xb0; C., a content of solvent A is from not less than 50 to less than 90 weight % based on the total weight of the ink; and a content of water is from not less than 10 to less than 45 weight % based on the total weight of the ink.

An ink for ink-jet recording containing: a colorant; and a set of solvent A and solvent B, provided that solvent B has a larger vapor pressure than solvent A, wherein the set of solvent A and solvent B has a maximum in viscosity by changing a mixing ratio of solvent A to solvent B; and a content of solvent A in weight (A) and a content of solvent B in weight (B) in the ink satisfy the following relationship: 50&#x2266;[A/(A+B)]&#xd7;100&#x2266;95.

An ink-jet recording method of forming an image with an ink-jet head, wherein the ink-jet head includes an ink chamber, an electric actuator provided in the ink chamber and an insulating layer covering the electric actuator, including steps of: feeding an ink containing a coloring material and a water-soluble solvent into ink chamber, and applying a driving voltage with a driving frequency of 10 kHz to 55 kHz onto the electric actuator so that the ink is jetted from the ink chamber so as to form the image; wherein the thickness of the insulating layer is 0.1 &mgr;m to 10 &mgr;m, and the concentration of oxygen dissolved in the ink is 4 ppm or less.

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Hachioji, Japan

Kenichi Ohkubo