Surface-modified metal compound particles, and method for producing surface-modified metal compound particles

Patent metadata

Field	Value
Publication number	US-11325838-B2
Application number	US-201916763533-A
Country	US
Kind code	B2
Filing date	Jan 10, 2019
Priority date	Jan 24, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

These surface-modified metal compound particles have metal compound particles the surfaces of which are modified by: at least one first carboxylic acid selected from the group consisting of a methacrylic acid, an acrylic acid, and a propionic acid; and at least one second carboxylic acid selected from the group consisting of a C6-C16 fatty acid and a C7-C32 monovalent carboxylic acid having at least one benzene ring, wherein at least a portion of the first carboxylic acid is a carboxylic acid type in which a hydrogen atom of the carboxy group is not dissociated as an ion.

First claim

The invention claimed is:

1. Surface-modified metal compound particles comprising:
metal compound particles that are surface-modified with at least one first carboxylic acid selected from the group consisting of methacrylic acid, acrylic acid, and propionic acid, and at least one second carboxylic acid selected from the group consisting of a fatty acid having 6 to 16 carbon atoms and a monovalent carboxylic acid having at least one benzene ring and 7 to 32 carbon atoms,
wherein at least a portion of the first carboxylic acid is a carboxylic acid type in which a hydrogen atom of a carboxy group is not dissociated as an ion.

2. The surface-modified metal compound particles according to claim 1 , wherein the second carboxylic acid is a carboxylate type in which a hydrogen atom of a carboxy group is dissociated as an ion.

3. The surface-modified metal compound particles according to claim 1 , wherein a metal constituting the metal compound particles is at least one selected from the group consisting of zirconium and rare earths.

4. The surface-modified metal compound particles according to claim 1 , wherein a metal compound constituting the metal compound particles is a metal oxide.

5. A method for producing the surface-modified metal compound particles according to claim 1 , the method comprising:
a step A of adding at least one second carboxylic acid selected from the group consisting of a fatty acid having 6 to 16 carbon atoms and a monovalent carboxylic acid having at least one benzene ring and 7 to 32 carbon atoms to metal compound particles having positive zeta potential and being dispersed in a water solvent;
a step B of drying a product obtained through the step A; and
a step C of adding at least one first carboxylic acid selected from the group consisting of methacrylic acid, acrylic acid, and propionic acid after the step B.

6. The method for producing surface-modified metal compound particles according to claim 5 , wherein a metal compound concentration of a product after the step B is 80 wt % or less in terms of oxide.

Assignees

• Daiichi Kigenso Kagaku Kogyo

Inventors

• Takasaki Fumiyuki

Classifications

• C01F17/206

  oxide or hydroxide being the only anion · CPC title

• C09C1/00

  Treatment of specific inorganic materials other than fibrous fillers (tenebrescent materials C09K9/00; luminescent materials C09K11/00); Preparation of carbon black · CPC title

• C01G25/02

  Oxides · CPC title

• C09C3/08

  Treatment with low-molecular-weight {non-polymer} organic compounds {(C09C3/006, C09C3/048 take precedence)} · CPC title

• C01B13/145 Primary

  After-treatment of oxides or hydroxides, e.g. pulverising, drying, decreasing the acidity · CPC title