Near-infrared absorbing fine particle dispersion liquid and method for producing the same

Patent metadata

Field	Value
Publication number	US-10442948-B2
Application number	US-201615546964-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Jan 27, 2015
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

Provided is a near infrared absorbing fine particle dispersion liquid, which can be applied to offset printing, including: a solvent of one or more kinds selected from vegetable oils and vegetable oil-derived compounds; near infrared absorbing fine particles of one or more kinds selected from 10 mass % more and 25 mass % or less of a composite tungsten oxide expressed by M x W y O z , and/or a tungsten oxide having a Magneli phase expressed by a general formula W y O z ; and a dispersant soluble in the solvent and having a fatty acid in its structure, wherein a viscosity is 180 mPa/S or less.

First claim

The invention claimed is:

1. A near infrared absorbing fine particle dispersion liquid, comprising:
a solvent selected from the group consisting of vegetable oils and vegetable oil-derived compounds;
near infrared absorbing fine particles each having a dispersed particle size in the range of 1 nm to 200 nm, the near infrared absorbing fine particles being selected from the group consisting of:
fine particles of a composite tungsten oxide expressed by M x W y O z , in which:
M is at least one element selected from the group consisting of H, He, an alkali metal, an alkaline earth metal, a rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I,
W is tungsten,
O is oxygen,
0.001≤x/y≤1, and
2.2≥z/y≥3.0, and

fine particles of a tungsten oxide having a Magneli phase expressed by a general formula W y O z , in which:
W is tungsten,
O is oxygen, and
2.45≤z/y≤2.999; and

30 to 200 parts by weight of a dispersant based on 100 parts by weight of the near infrared absorbing fine particles, the dispersant being soluble in the solvent and having a fatty acid in its structure,
wherein:
a concentration of the near infrared absorbing fine particles in the near infrared absorbing fine particle dispersion liquid is in the range of 10 mass % to 25 mass %, and
a viscosity of the near infrared absorbing fine particle dispersion liquid at 24° C. is 180 mPa·s or less, as measured using a vibration type viscometer.

2. The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein an anchor portion of the dispersant has a secondary amino group, a tertiary amino group, or a quaternary ammonium group.

3. The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein the dispersant has an acid value of 1 mg KOH/g or more.

4. The near infrared absorbing fine particle dispersion liquid according to claim 1 , comprising the fine particles of a composite tungsten oxide, wherein the fine particles of the composite tungsten oxide have a hexagonal crystal structure or are composed of a hexagonal crystal structure.

5. The near infrared absorbing fine particle dispersion liquid according to claim 1 , comprising the fine particles of a composite tungsten oxide, wherein a lattice constant of the fine particles of the composite tungsten oxide is 0.74060 nm or more and 0.74082 nm or less on the a-axis and 0.76106 nm or more and 0.76149 nm or less on the c-axis.

6. The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein a surface of each near infrared absorbing fine particle is coated with a compound of comprising at least one element selected from the group consisting of Si, Ti, Al and Zr.

7. The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein the solvent comprises a drying vegetable oil or a semi-drying vegetable oil.

8. A method for producing the near infrared absorbing fine particle dispersion liquid of claim 1 , comprising:
mixing the near-infrared absorbing fine particles, the solvent and the dispersant; and
dispersing the mixture in a wet medium mill.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Okada Mika
• Fukuyama Hideaki

Classifications

• C09D17/00

  Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06) · CPC title

• C09D11/037

  characterised by the pigment · CPC title

• C09D11/50

  Sympathetic, colour changing or similar inks · CPC title

• C09K3/00 Primary

  Materials not provided for elsewhere · CPC title

• C09D17/007 Primary

  Metal oxide · CPC title