Organic solvent dispersion of titanium oxide particles and method for producing same

Patent metadata

Field	Value
Publication number	US-10047239-B2
Application number	US-201615552532-A
Country	US
Kind code	B2
Filing date	Feb 23, 2016
Priority date	Feb 27, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The invention provides an organic solvent dispersion of titanium oxide particles in a content of 10% by weight or more in an organic solvent except methanol and ethanol,
wherein the titanium oxide particles are surface-treated with a surface treating agent comprising a silane coupling agent having the general formula (I)

(RO) n —Si—X 4-n   (I)

wherein R is an alkyl group having carbon atoms of 1-4, n is 2 or 3, X is an alkyl, a fluoroalkyl, a vinyl or a (meth)acryloyloxyalkyl group, and 12-hydroxystearic acid, and
wherein the titanium oxide particles in the organic solvent have a D50 in a range of 1 to 30 nm, and wherein the organic solvent dispersion has a transmittance of 2% or more at a wavelength of 500 nm and a transmittance of 70% or more at a wavelength of 800 nm, a viscosity of 10 mPa·s or less at a temperature of 25° C. immediately after production while the increase in the viscosity is 40 mPa·s or less seven days after production as compared to that of the dispersion immediately after production.

First claim

The invention claimed is:

1. An organic solvent dispersion of titanium oxide particles in a content of 10% by weight or more in an organic solvent except methanol and ethanol,
wherein the titanium oxide particles are surface-treated with a surface treating agent comprising a silane coupling agent having the general formula (I)
(RO) n —Si—X 4-n   (I)

wherein R is an alkyl group having carbon atoms of 1-4, n is 2 or 3, X is an alkyl, a fluoroalkyl, a vinyl or a (meth)acryloyloxyalkyl group, and 12-hydroxystearic acid, and
wherein the titanium oxide particles in the organic solvent have a D50 in a range of 1 to 30 nm, and
wherein the organic solvent dispersion has a transmittance of 2% or more at a wavelength of 500 nm and a transmittance of 70% or more at a wavelength of 800 nm, a viscosity of 10 mPa·s or less at a temperature of 25° C. immediately after production while an increase in the viscosity is 40 mPa·s or less seven days after production as compared to that of the dispersion immediately after production.

2. The organic solvent dispersion of titanium oxide in an organic solvent according to claim 1 , in which the titanium oxide particles are surface-treated with 1-40 parts by weight of the silane coupling agent and 1-80 parts by weight of 12-hydroxystearic acid each in relation to 100 parts by weight of the titanium oxide particles.

3. The organic solvent dispersion of titanium oxide in an organic solvent according to claim 1 , in which the organic solvent is at least one selected from methyl isobutyl ketone, methyl ethyl ketone, diacetone alcohol, butanol, propanol, propylene glycol monomethyl ether, toluene, dimethylsulfoxide, N,N-dimethylacetamide, N,N,2-trimethylpropionamide, γ-butyrolactone, and butyl acetate.

4. The organic solvent dispersion of titanium oxide in an organic solvent according to claim 2 , in which the organic solvent is at least one selected from methyl isobutyl ketone, methyl ethyl ketone, diacetone alcohol, butanol, propanol, propylene glycol monomethyl ether, toluene, dimethylsulfoxide, N,N-dimethylacetamide, N,N,2-trimethylpropionamide, γ-butyrolactone, and butyl acetate.

Assignees

• Sakai Chemical Industry Co

Inventors

• Morita Takanori
• Miyata Atsushi
• ONISHI Kasumi

Classifications

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• C01P2004/40

  prism-like · CPC title

• C01P2006/60

  Optical properties, e.g. expressed in CIELAB-values · CPC title

• C01G23/047

  Titanium dioxide · CPC title

• C09D17/008 Primary

  Titanium dioxide · CPC title