Thermally conductive complex oxide, production method therefor, thermally conductive complex oxide-containing composition, and use therefor

Patent metadata

Field	Value
Publication number	US-2016369148-A1
Application number	US-201515122321-A
Country	US
Kind code	A1
Filing date	Mar 12, 2015
Priority date	Mar 14, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

An object of the present invention is to provide a thermally conductive composite oxide that can realize physical properties required for coating films, films, and molded products obtained by single use of the thermally conductive composite oxide blended into paints and resin compositions without the need for an improvement measure such as surface treatment and that is excellent in thermal conductivity, water resistance, acid resistance, and electric insulation. The object is achieved by a thermally conductive composite oxide and the production process thereof, the thermally conductive composite oxide being a composite oxide having a spinel structure and containing aluminum as a main component metal and at least one metal other than aluminum, and in the thermally conductive composite oxide, the metal other than aluminum is at least one selected from the group consisting of magnesium, zinc, calcium, and strontium, the ratio, (b mol)/(a mol), of the number of moles (b) of the metal other than aluminum to the number of moles (a) of an aluminum element in the alumina-based compound is 0.1 or more and 1.0 or less, and the Mohs hardness of the thermally conductive composite oxide is less than 9.

First claim

1 . A thermally conductive composite oxide being a composite oxide having a spinel structure, obtained by firing at least an alumina-based compound and a compound of a metal other than aluminum, and comprising:
aluminum as a main component metal; and at least one metal other than aluminum, wherein the metal other than aluminum is at least one selected from the group consisting of magnesium, zinc, calcium and strontium, a ratio, (b mol)/(a mol), of a number of moles (b) of the metal other than aluminum to a number of moles (a) of an aluminum element in the alumina-based compound is 0.1 or more and 1.0 or less, and a Mohs hardness of the thermally conductive composite oxide is less than 9.

2 . The thermally conductive composite oxide according to claim 1 , wherein a content ratio of each metal to a total amount of all the metals is 50 to 90 mol % for aluminum derived from the alumina-based compound and is 10 to 50 mol % for the metal other than aluminum.

3 . The thermally conductive composite oxide according to claim 1 , wherein the alumina-based compound is alumina, aluminum hydroxide, or an alumina hydrate.

4 . The thermally conductive composite oxide according to claim 1 , wherein the compound of the metal other than aluminum is at least one selected from the group consisting of an oxide, a hydroxide, a sulfate, a nitrate, a chloride, a carbonate, a basic carbonate, an oxalate, and an acetate of the metal other than aluminum.

5 . The thermally conductive composite oxide according to claim 1 , having a flake-like or needle-like shape having an average major axis diameter of 5 to 40 μm and an average minor axis diameter of 0.1 to 30 μm, or having a powdered form.

6 . A process for producing the thermally conductive composite oxide according to claim 1 , the process comprising:
adding an alkali agent and an aqueous solution of the compound of the metal other than aluminum to an aqueous suspension solution of the alumina-based compound to deposit a precipitate on a surface of the alumina-based compound, thereby producing a precursor; and firing the produced precursor and thereafter subjecting the fired product to pulverization treatment.

7 . The process for producing the thermally conductive composite oxide according to claim 6 , wherein the alumina-based compound has a granular, flake-like, or needle-like shape.

8 . A thermally conductive composite oxide-containing composition, comprising:
the thermally conductive composite oxide according to claim 1 to 5; and a thermally conductive filler.

9 . An article using the thermally conductive composite oxide according to claim 1 or the thermally conductive composite oxide-containing composition according to claim 8 for a combination constituting a coating liquid or a resin composition.

Assignees

• Dainichiseika Color Chem

Inventors

• Nishio Akira
• Kawakami Toru
• Yamane Kenichi
• YAMAMURA Naotsugu
• Tominaga Shingo

Classifications

• C01F7/162 Primary

  Magnesium aluminates · CPC title

• C01P2004/62

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

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• C01P2002/32

  spinel-type (AB2O4) · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title