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

Patent metadata

Field	Value
Publication number	US-2018016451-A1
Application number	US-201615546934-A
Country	US
Kind code	A1
Filing date	Jan 27, 2016
Priority date	Jan 27, 2015
Publication date	Jan 18, 2018
Grant date	—

Abstract

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 ray-absorbing fine particles of one or more kinds selected from composite tungsten oxide expressed by MxWyOz or tungsten oxide having a Magneli phase expressed by a general formula WyOz; a solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons and glycol ethers and having a boiling point of 180° C. or less, wherein a content of the solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons and glycol ethers is 5 mass % or less.

First claim

1 . A near infrared absorbing fine particle dispersion liquid, comprising:
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 composite tungsten oxide expressed by MxWyOz (M is H, He, alkali metal, alkaline earth metal, 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, and O is oxygen, satisfying 0.001≦x/y≦1, 2.2≦z/y≦3.0), or a tungsten oxide having a Magneli phase expressed by a general formula W y O z (W is tungsten, O is oxygen, satisfying 2.45≦z/y≦2.999), and a solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons, and glycol ethers and having a boiling point of 180° C. or less, wherein a content of the solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons and glycol ethers is 5 mass % or less.

2 . The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein the near infrared absorbing fine particle dispersion liquid further contains a dispersant which is soluble in the solvent of one or more kinds selected from the vegetable oils or the vegetable oil-derived compounds and has a fatty acid in its structure, and
a concentration of the composite tungsten oxide in the near infrared absorbing fine particle dispersion liquid is 25 mass % or more and 75 mass % or less.

3 . The near infrared absorbing fine particle dispersion liquid according to claim 2 , wherein an anchor portion of the dispersant contains at least one of a secondary amino group, a tertiary amino group, and a quaternary ammonium group.

4 . The near infrared absorbing fine particle dispersion liquid according to claim 2 , wherein the dispersant has an acid value of 1 mg KOH/g or more.

5 . The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein a dispersed particle size of each near infrared absorbing fine particle is 1 nm or more and 200 nm or less.

6 . The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein the near infrared ray absorbing fine particles expressed by M x W y O z have a hexagonal crystal structure or composed of a hexagonal crystal structure.

7 . The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein a lattice constant of the near infrared absorbing fine particles expressed by M x W y O z 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.

8 . 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 one kind or more selected from Si, Ti, Al and Zr.

9 . The near infrared absorbing fine particle dispersion liquid according to claim 1 , wherein the vegetable oil is one or more kinds selected from drying oils and semi-drying oils.

10 . A method for producing a near infrared absorbing fine particle dispersion liquid, comprising:
mixing Infrared absorbing fine particles into a solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons, glycol ethers and having a boiling point of 180° C. or less, then dispersing the mixture in a medium mill, to thereby obtain a first dispersion liquid; adding and mixing the solvent of one or more kinds selected from vegetable oils or vegetable oil-derived compounds into the first dispersion liquid, to thereby obtain a second dispersion liquid; removing from the second dispersion liquid the solvent of one or more kinds selected from the alcohols, ethers, esters, ketones, aromatic hydrocarbons, and glycol ethers, until contents of the solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons and glycol ethers, and the solvent having a boiling point of 180° C. or less is 5 mass % or less.

11 . The method for producing a near infrared absorbing fine particle dispersion liquid of the tenth invention, wherein a concentration of the near infrared absorbing fine particles in the first dispersion liquid is 5 mass % or more and 50 mass % or less.

12 . A method for producing a near infrared absorbing fine particle dispersion liquid, comprising:
mixing a solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons and glycol ethers and having a boiling point of 180° C. or less and a solvent of one or more kinds selected from vegetable oils or vegetable oil-derived compounds, to thereby obtain a mixed solvent; mixing infrared absorbing fine particles into the mixed solvent and dispersing the mixture in a wet medium mill, to thereby obtain a third dispersion liquid; and removing from the second dispersion liquid the solvent of one or more kinds selected from the alcohols, ethers, esters, ketones, aromatic hydrocarbons, and glycol ethers, until contents of the solvent of one or more kinds selected from alcohols, ethers, esters, ketones, aromatic hydrocarbons and glycol ethers, and the solvent having a boiling point of 180° C. or less is 5 mass % or less.

13 . The method for producing a near infrared absorbing fine particle dispersion liquid according to claim 12 , wherein the concentration of the near infrared ray absorbing fine particles in the third dispersion liquid is 5 mass % or more and 50 mass % or less.

14 . The method for producing the near infrared absorbing fine particle dispersion liquid according to claim 10 , wherein a dispersant having a fatty acid soluble in the solvent in its structure is added to the solvent of one or more kinds selected from the vegetable oils or vegetable oil-derived compounds.

Assignees

• Sumitomo Metal Mining Co

Inventors

• Okada Mika
• Fukuyama Hideaki

Classifications

• C01P2004/80

  Particles consisting of a mixture of two or more inorganic phases · CPC title

• C09D17/00

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

• C09D11/037 Primary

  characterised by the pigment · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title

• C09K3/00 Primary

  Materials not provided for elsewhere · CPC title