Method for producing oxide particles with controlled color characteristics, oxide particles, and coating or film-like composition comprising the same

Patent metadata

Field	Value
Publication number	US-10400107-B2
Application number	US-201715540958-A
Country	US
Kind code	B2
Filing date	Feb 2, 2017
Priority date	Feb 2, 2016
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

An object of the present invention is to provide a method for producing oxide particles with controlled color characteristics and to provide oxide particles with controlled color characteristics. The present invention provides a method for producing oxide particles, comprising controlling color characteristics of the oxide particles by controlling the ratio of M-OH bonds, the binding of one or more different elements (M) other than oxygen or hydrogen with hydroxyl group (OH), in oxide particles selected from metal oxide particles and metalloid oxide particles. According to the present invention, oxide particles having controlled color characteristics of any one of reflectance, transmittance, molar absorption coefficient, hue, or color saturation can be provided by controlling the percentage of the M-OH bonds contained in metal oxide particles or metalloid oxide particles.

First claim

The invention claimed is:

1. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least a part of the surface of the oxide particles, and
wherein the ratio of M-OH bonds contained in the oxide particles is 8% or more and 14.5% or less, the average reflectance of the oxide particles for light rays at wavelengths of 780nm to 2500 nm is 50% or more.

2. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound, according to claim 1 ,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least partially the surface of the oxide particles, and
wherein the ratio of M-OH bonds contained in the oxide particles is 10% or more and 14.5% or less, and the maximum reflectance of the oxide particles for light rays at a wavelength of 400 nm to 620 nm is 18% or less.

3. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound, according to claim 1 ,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least partially the surface of the oxide particles, and
wherein the ratio of M-OH bonds contained in the oxide particles is 9.5% or more and 13% or less, and the average reflectance of the oxide particles for light rays at wavelengths of 620 nm to 750 nm is 22% or less.

4. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound, according to claim 1 ,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least partially the surface of the oxide particles, and
wherein the ratio of M-OH bonds contained in the oxide particles is 8% or more and 14.5% or less, and hue H(=b*/a*) in an L*a*b* colorimetric system is in the range of 0.5 to 0.9.

5. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound, according to claim 1 ,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least partially the surface of the oxide particles, and
wherein the ratio of M-OH bonds contained in the oxide particles is 9% or more and 14.5% or less, and, in a transmission spectrum of a dispersion in which the oxide particles are dispersed in a dispersion medium, the transmittance for light rays at a wavelength of 380 nm is 5% or less and the transmittance for light rays at a wavelength of 600 nm is 80% or more.

6. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound, according to claim 1 ,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least partially the surface of the oxide particles, and
wherein, the ratio of M-OH bonds contained in the oxide particles is 9% more and 14.5% or less, and, in a dispersion in which the oxide particles are dispersed in a dispersion medium, an average molar absorption coefficient for light rays at wavelengths of 190 nm to 380 nm is 2200 L/(mol·cm) or more.

7. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound, according to claim 1 ,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least partially the surface of the oxide particles, and
wherein the oxide particles include ester bonds, and the ratio of M-OH bonds contained in the oxide particles is 9% or more and 13% or less, and the average reflectance of the oxide particles for light rays at wavelengths of 780 nm to 2500 nm is 50% or more.

8. Silicon compound-coated oxide particles in which at least a part of the surface of the oxide particles is coated with a silicon compound, according to claim 1 ,
wherein the oxide contained in the oxide particles is iron oxide, and the silicon compound is able to change the color characteristics of the oxide particles by coating at least partially the surface of the oxide particles, and
wherein the ratio of M-OH bonds contained in the oxide particles is 8% or more and 9.3% or less, or 13.3% or more and 14.5% or less, and the average reflectance of the oxide particles for light rays at wavelengths of 620 nm to 750 nm is higher than 22%.

9. The oxide particles according to claim 1 , wherein the oxide particles are oxide particles in which at least a part of the surface of a single oxide particle or at least a part of the surface of an aggregate formed by aggregation of a plurality of oxide particles is coated with a silicon compound, and the particle diameter of the oxide particle or the aggregate of oxide particle is 1 nm or more and 50 nm or less.

10. The oxide particles according to claim 1 , wherein the silicon compound comprises amorphous silicon oxide.

11. A method for producing the oxide particles of claim 1 , comprising controlling color characteristics of the oxide particles by controlling the ratio of M-OH bonds, the binding of one or more different elements (M) other than oxygen or hydrogen with hydroxyl group (OH) in oxide particles selected from metal oxide particles and metalloid oxide particles,
wherein the ratio of M-OH bonds contained in the oxide particles is controlled by modifying a functional group contained in the oxide particles, and
wherein the modification of the functional group is esterification.

12. The method for producing oxide particles according to claim 11 , wherein the modification of the functional group is any one of an addition reaction, an elimination reaction, a dehydration reaction, and a displacement reaction.

13. A method for producing oxide particles according to claim 11 , comprising controlling color characteristics of the oxide particles by controlling the ratio of M-OH bonds, the binding of one or more different elements (M) other than oxygen or hydrogen with hydroxyl group (OH) in oxide particles selected from metal oxide particles and metalloid oxide particles,
wherein the ratio of M-OH bonds is controlled using a dispersion-improving apparatus comprising a removal unit with a membrane filter.

14. A method for producing oxide particles according to claim 11 , comprising controlling color characteristics of the oxide particles by controlling the ratio of M-OH bonds, the binding of one or more different elements (M) other than oxygen or hydrogen with hydroxyl group (OH) in oxide particles selected from metal oxide particles and metalloid oxide particles,
wherein the ratio of M-OH bonds is controlled by a state of a dispersion in which the oxide particles are dispersed in a dispersion medium, and
wherein the dispersion is in the form of a coating film, and the color characteristics of the oxide particles are controlled by subjecting the coating film-like dispersio

Assignees

• M Technique Co Ltd

Inventors

• Enomura Masakazu
• Honda Daisuke

Classifications

• C09C3/12

  Treatment with organosilicon compounds {(C09C3/006 takes precedence)} · CPC title

• C09C3/06

  Treatment with inorganic compounds {(C09C3/006, C09C3/048 take precedence)} · CPC title

• C09C1/28

  Compounds of silicon {(C09C1/0009, C09C1/0015, C09C1/0078 take precedence)} · CPC title

• C09C1/24 Primary

  Oxides of iron · CPC title

• C09C1/043

  Zinc oxide · CPC title