Dispersion of zirconium oxide, process for producing the same, and resin composition containing the same

Patent metadata

Field	Value
Publication number	US-9751776-B2
Application number	US-200913132728-A
Country	US
Kind code	B2
Filing date	Nov 26, 2009
Priority date	Dec 4, 2008
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

The invention provides a dispersion of zirconium oxide having a content as high as 20% by weight or more, but a low viscosity, and having a high transparency, which has a transmittance of 35% or more at a wave length of 400 nm, a transmittance of 95% or more at a wave length of 800 nm, and a viscosity of 20 mPa·s or less at a temperature of 25° C. Such a dispersion of zirconium oxide can be obtained by reacting a zirconium salt with an alkali in water to obtain a slurry of particles of zirconium oxide; filtering, washing, and repulping the slurry; adding an organic acid to the resulting slurry in an amount of one mole part or more per mole part of the zirconium in the slurry; hydrothermally treating the slurry at a temperature of 170° C. or higher; and washing and concentrating the resulting aqueous dispersion of particles of zirconium oxide.

First claim

The invention claimed is:

1. A dispersion of zirconium oxide comprising particles of zirconium oxide in a content of 20% by weight or more based on 100% by weight of the dispersion and having a transmittance of 35% or more at a wave length of 400 nm, a transmittance of 95% or more at a wave length of 800 nm, and a viscosity of 20 mPa·s or less at a temperature of 25° C., wherein the transmittance is measured by using a cell having a light path length of 10 mm.

2. The dispersion of zirconium oxide according to claim 1 , wherein the zirconium oxide is in a solid solution comprising at least one stabilizing element selected from aluminum, magnesium, titanium and rare earth elements.

3. The dispersion of zirconium oxide according to claim 1 or 2 , wherein a dispersion medium of the dispersion of zirconium oxide is water.

4. The dispersion of zirconium oxide according to claim 1 or 2 , wherein a dispersion medium of the dispersion of zirconium oxide is an aliphatic alcohol, an aliphatic carboxylic acid ester, an aliphatic ketone, a polyhydric alcohol, or a mixture of two or more of these.

5. A resin composition comprising a resin and the dispersion of zirconium oxide according to claim 1 or 2 incorporated therein.

6. A resin composition comprising a resin and the dispersion of zirconium oxide according to claim 3 incorporated therein.

7. A resin composition comprising a resin and the dispersion of zirconium oxide according to claim 4 incorporated therein.

Assignees

• Nakagawa Kenichi
• Morita Takanori
• Sakai Chemical Industry Co

Inventors

• Nakagawa Kenichi
• Morita Takanori

Classifications

• C01G25/02 Primary

  Oxides · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2004/62

  Submicrometer sized, i.e. from 0.1-1 micrometer · CPC title

• C01P2006/60

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