Plate-like alumina particle and a manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-10808131-B2
Application number	US-201715842937-A
Country	US
Kind code	B2
Filing date	Dec 15, 2017
Priority date	Dec 15, 2017
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

An object of the present invention is to provide a high-aspect-ratio plate-like alumina particle having low aggregability and high dispersibility and a method for producing the particle. The above problem is solved by providing a plate-like alumina particle including a step of firing an aluminum compound in the presence of a shape-controlling agent and a molybdenum compound serving as a fluxing agent. The above problem is solved also by providing a method for producing a plate-like alumina particle, the method including a step in which the aluminum compound and the molybdenum compound react with each other to form aluminum molybdate and a step in which the aluminum molybdate is decomposed to obtain the plate-like alumina particle.

First claim

The invention claimed is:

1. A method for producing a plate-like alumina particle having an aspect ratio obtained by dividing an average particle size by a thickness is 2 or more that includes molybdenum in the particle comprising firing an aluminum compound in the presence of a fluxing agent and in the presence of a shape-controlling agent; wherein the shape-controlling agent is a compound including silicon, a silicon atom, a compound including sodium or a sodium atom; and
wherein the fluxing agent is a molybdenum compound.

2. The method for producing a plate-like alumina particle according to claim 1 , further comprising:
a step in which the aluminum compound and the molybdenum compound react with each other to form aluminum molybdate; and
a step in which the aluminum molybdate is decomposed to obtain a plate-like alumina particle that includes molybdenum in the particle.

3. The method for producing a plate-like alumina particle according to claim 1 , wherein the plate-like alumina particle has an isoelectric point of zeta potential shifted to an acidic side.

4. The method for producing a plate-like alumina particle according to claim 1 , wherein the plate-like alumina particle has a thickness of 0.01 to 5 μm, an average particle diameter of 0.1 to 500 μm, an aspect ratio which is a ratio of a particle size to a thickness, a polygonal plate-like particle shape, and molybdenum in the particle, wherein the aspect ratio is 2 to 500.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Yuan Jian Jun
• Kinoshita Hiroshi

Classifications

• C04B35/653

  Processes involving a melting step · CPC title

• C04B2235/3418

  Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint · CPC title

• C10N2020/06

  Particles of special shape or size · CPC title

• C10N2010/12

  Groups 6 or 16 · CPC title

• C09K5/14

  Solid materials, e.g. powdery or granular · CPC title