Pigment dispersion, ink composition, inkset, and recording device

Patent metadata

Field	Value
Publication number	US-9550900-B2
Application number	US-201414550115-A
Country	US
Kind code	B2
Filing date	Nov 21, 2014
Priority date	Dec 19, 2006
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

A pigment dispersion containing metal pigment, wherein the metal pigment contains plate-like particles, and in the case where the longitudinal diameter on the planar surface of the plate-like particle is X, the lateral diameter is Y, and the thickness is Z, the 50% average particle diameter R50 of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particle is between 0.5 and 3 μm, and the condition R50/Z>5 is satisfied.

First claim

The invention claimed is:

1. A non-aqueous inkjet ink composition, comprising:
a metal pigment containing plate-like particles; and
an organic solvent containing an alkylene glycol ether and a lactone,
wherein the maximum particle diameter Rmax of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particles is 10 μm or less,
wherein the metal pigment is aluminum or an aluminum alloy, and
wherein the concentration of lactone in the ink composition is 15% by mass or less.

2. The non-aqueous inkjet ink composition according to claim 1 , wherein the alkylene glycol ether comprises an alkylene glycol diether and/or an alkylene glycol monoether,
wherein the alkylene glycol monoether is selected from a group consisting of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether, ethylene glycol monophenyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, tetraethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, and dipropylene glycol monoethyl ether, and
wherein the alkylene glycol diethers is selected from a group consisting of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, triethylene glycol dibutyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, tetraethylene glycol dibutyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, dipropylene glycol dimethyl ether, and dipropylene glycol diethyl ether.

3. The non-aqueous inkjet ink composition according to claim 1 , wherein the lactone is selected from a group consisting of γ-butyrolactone, δ-valerolactone, and ε-caprolactone.

4. The non-aqueous inkjet ink composition according to claim 1 , wherein in the case where the longitudinal diameter on the planar surface of the plate-like particle is X, the lateral diameter is Y, and the thickness is Z, the 50% average particle diameter R50 of a corresponding circle determined from the surface area in the X-Y plane of the plate-like particle is between 0.5 and 3 μm, and the condition R50/Z>5 is satisfied.

5. The non-aqueous inkjet ink composition according to claim 1 , wherein the particle size distribution CV value of the metal pigment as determined by the following Equation 1 is 60 or less:
CV value=standard deviation of particle size distribution/average particle diameter×100.  Equation 1

6. The non-aqueous inkjet ink composition according to claim 1 , wherein the concentration of the metal pigment in the ink composition is between 0.1 and 3.0 wt %.

7. The non-aqueous inkjet ink composition according to claim 1 , further comprising a resin.

8. The non-aqueous inkjet ink composition according to claim 6 , wherein the resin is at least one type of resin selected from a group consisting of polyvinyl butyral, cellulose acetatobutyrate, and polyacryllic polyol.

9. An inkjet recording method for forming an image where the measurement values for the specular gloss of the recording medium at angles of 20°, 60°, and 85° are no less than 200, 200, and 100, respectively, by using the inkjet ink composition according to claim 1 .

10. The non-aqueous inkjet ink composition according to claim 1 , wherein the amount of the organic solvent is 92.8% by mass or higher, based on the total amount of the ink composition.

Assignees

• Seiko Epson Corp

Inventors

• Oyanagi Takashi
• Nakano Keitaro

Classifications

• C09D11/14

  based on carbohydrates · CPC title

• B41J2/01

  Ink jet · CPC title

• C09D11/322 Primary

  Pigment inks · CPC title

• C09D11/06 Primary

  based on fatty oils · CPC title

• C09D11/36

  based on non-aqueous solvents · CPC title