INKJET INK, INKJET RECORDING METHOD, AND INKJET RECORDING DEVICE

• US 20140002539A1
• Filed: 03/09/2012
• Published: 01/02/2014
• Est. Priority Date: 03/14/2011
• Status: Active Grant

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Goto, Hiroshi, Gotoh, Akihiko, Nagai, Kiyofumi, Yokohama, Yuuki, Fujii, Hidetoshi
• Granted Patent: US 9,028,600 B2
• Time in Patent Office: Days
• US Class Current: 347/20
• CPC Class Codes: C09D 11/30 Inkjet printing inks
• CPC Class Codes: C09D 11/322 Pigment inks
• CPC Class Codes: C09D 11/38 characterised by non-macromolecular additives other than solvents, pigments or dyes

Abstract

An inkjet ink, which contains water, an organic solvent, a surfactant, and a colorant, wherein the organic solvent contains at least one polyhydric alcohol having an equilibrium moisture content of 30% by mass or higher at a temperature of 23° C. and humidity of 80% RH, at least an amide compound represented by the general formula (I), and at least one selected from the group consisting of compounds represented by the following general formulae (II) to (IV):

Claims

1. An inkjet ink, comprising:

water;

an organic solvent;

a surfactant; and

a colorant,

wherein the organic solvent comprises;

a polyhydric alcohol having an equilibrium moisture content of at least 30% by mass at a temperature of 23°

C. and a relative humidity of 80%,

an amide compound of Formula (I);

2. The inkjet ink according to claim 1,

wherein the colorant is a colorant comprising at least one functional group selected from the group consisting of —

COOM, —

SO₃M, —

PO₃HM, —

PO₃M₂, —

CONM₂, —

SO₃NM₂, NH—

C₆H₄—

COOM, —

NH—

C₆H₄—

SO₃M, —

NH—

C₆H₄—

PO₃HM, —

NH—

C₆H₄—

PO₃M₂, —

NH—

C₆H₄—

CONM₂, and —

NH—

C₆H₄—

SO₃NM₂, where M is a quaternary ammonium ion.

3. The inkjet ink according to claim 1,

wherein the colorant is a pigment modified with a geminal bisphosphonic acid or a geminal bisphosphonate.

4. The inkjet ink according to claim 3,

wherein the colorant is a pigment modified with a group of Formula (1), (2), (3), or (4):

5. The inkjet ink according to claim 1,

wherein the amide compound is a compound of Formula (V):

6. The inkjet ink according to claim 1,

wherein the colorant is a black pigment, a cyan pigment, a magenta pigment, a yellow pigment, or a mixture thereof.

7. The inkjet ink according to claim 1,

wherein the surfactant comprises at least one selected from the group consisting of a silicone surfactant, a fluorosurfactant, an acetylene glycol surfactant, and an acetylene alcohol surfactant.

8. The inkjet ink according to claim 1,

wherein the inkjet ink has a dynamic surface tension of 35 mN/m or lower at 25°

C. when a surface bubble lifetime is 15 ms and with a surface bubble lifetime of 15 ms in the measured by a maximum bubble pressure method.

9. An inkjet recording method, comprising:

applying a stimulus to an inkjet ink to make an inkjet ink jet thereby forming an image on a recording medium,

wherein the stimulus is selected from the group consisting of heat, pressure, vibration, and light,

the inkjet ink comprises;

water;

an organic solvent;

a surfactant; and

a colorant,

wherein the organic solvent comprises

a polyhydric alcohol having an equilibrium moisture content of at least 30% by mass at a temperature of 23°

C. and a relative humidity of 80%,

an amide compound of Formula (I);

10. An inkjet recording device, comprising:

an inkjet ink; and

an ink jetting unit configured to apply a stimulus to the inkjet ink to make an ink jet, thereby forming an image on a recording medium,

wherein the stimulus is selected from the group consisting of heat, pressure, vibration, and light,

wherein the inkjet ink comprises;

water;

an organic solvent;

a surfactant; and

a colorant,

wherein the organic solvent comprises

a polyhydric alcohol having an equilibrium moisture content of 30% by mass or higher at a temperature of 23°

C. and a relative humidity of 80%,

an amide compound of Formula (I);