Ink, image forming method, image forming apparatus, and recorded matter

Patent metadata

Field	Value
Publication number	US-9873809-B2
Application number	US-201615194832-A
Country	US
Kind code	B2
Filing date	Jun 28, 2016
Priority date	Jul 7, 2015
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

Ink includes a coloring material, an organic solvent, and water, wherein the ink satisfies the following requisites:
I. the organic solvent includes an organic solvent X having a solubility parameter (SP value) of 8.9-12.0, II. the organic solvent includes glycol ether compound (compound Z) having a vapor pressure of 50 mmHg or greater at 100 degrees C., and III. a mass ratio of the organic solvent X to the glycol ether compound is 1:1-8:1.

First claim

What is claimed is:

1. An ink, comprising:
a coloring material;
an organic solvent; and
water,
wherein the ink satisfies the following requisites I to III:
I. the organic solvent includes an organic solvent X having a solubility parameter (SP value) of 8.9-12.0,
II. the organic solvent includes glycol ether compound having a vapor pressure of 50 mmHg or greater at 100 degrees C.; and
III. a mass ratio of the organic solvent X to the glycol ether compound is 1:1-8:1.

2. The ink according to claim 1 , wherein the glycol ether compound comprises at least one selected from the group consisting of propyleneglycol monopropylether, propyleneglycol monomethylether, propyleneglycol monoethylether, propylene glycol monobutylether, 3-methoxy-1-butanol, and 3-methoxy-3-methyl-1-butanol.

3. The ink according to claim 1 , wherein the organic solvent X accounts for 20 percent by mass of a total mass of the ink.

4. The ink according to claim 1 , wherein the organic solvent X is represented by the following Chemical formula 1 or Chemical formula 2:

wherein R′ represents an alkyl group having 4-6 carbon atoms, and

wherein R″ represents an alkyl group having one or two carbon atoms.

5. The ink according to claim 1 , further comprising a surfactant comprising a polyether-modified siloxane compound.

6. The ink according to claim 1 , wherein the ink has a static surface tension of 20 mN/m or greater and a dynamic surface tension of 34 mN/m or less at a bubble life time of 15 msec as measured by maximum bubble pressure technique.

7. The ink according to claim 1 , wherein the coloring material comprises a pigment.

8. An image forming method, comprising:
applying at least one kind of stimulus selected from the group consisting of heat, pressure, vibration, and light to the ink of claim 1 to jet the ink of claim 1 ; and
forming an image on a recording medium with the ink of claim 1 .

9. An image forming apparatus, comprising:
the ink of claim 1 ; and
an ink discharging device configured to apply at least one kind of stimulus selected from the group consisting of heat, pressure, vibration, and light to the ink of claim 1 to jet the ink of claim 1 to a recording medium to form an image thereon.

10. A recorded matter, comprising:
a recording medium; and
an image formed on the recording medium with the ink of claim 1 .

11. The ink according to claim 1 , wherein
the organic solvent X comprises at least one selected from the group consisting of 3-n-buthoxy-N,N-dimethyl propaneamide, 3-ethyl-3-hydroxymethyl oxetane and 3-methyl-3-hydroxymethyl oxetane, and
the glycol ether compound comprises at least one selected from the group consisting of propylene glycol mono-propylether, propylene glycol monomethylether, propylene glycol monoethylether, propylene glycol monobutylether, 3-methoy-1-butanol and 3-methoy-3-methyl-1-butanol.

Assignees

• Goto Hiroshi
• Katoh Keita
• Yokohama Yuuki
• Takamura Yukiko
• Sakaguchi Hiromi
• Ricoh Co Ltd

Inventors

• Gotou Hiroshi
• Katoh Keita
• Yokohama Yuuki
• Takamura Yukiko
• Sakaguchi Hiromi

Classifications

• C09D11/322 Primary

  Pigment inks · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09D11/36

  based on non-aqueous solvents · CPC title

• C09D11/033

  characterised by the solvent · CPC title