# US 9,751,776 B2 · Dispersion of zirconium oxide, process for producing the same, and resin composition containing the same

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- Number: US 9,751,776 B2
- Document ID: US9751776B2
- Status: Granted
- Kind: B2
- Application number: 13/132,728
- Filed: 2009-11-26
- Published: 2011-10-06
- Granted: 2017-09-05
- Earliest claimed: 2008-12-04
- Assignees: Sakai Chemical Industry Co., Ltd.
- Applicants: Kenichi Nakagawa; Takanori Morita
- Inventors: Kenichi Nakagawa; Takanori Morita
- Web page: https://patentgrep.com/patent/US9751776B2

## CPC

- C01G 25/02: Oxides
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C01P 2002/54: one element only
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer
- C01P 2006/22: Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
- C01P 2006/40: Electric properties
- C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values
- C08K 3/22: of metals
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1, 2)

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

### Claim 4 (depends on 1, 2)

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.

### Claim 5 (depends on 1, 2)

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

### Claim 6 (depends on 3)

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

### Claim 7 (depends on 4)

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