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-11084936-B2
Application number	US-201916511725-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Feb 2, 2016
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

A method for producing oxide particles with controlled color characteristics and to provide oxide particles with controlled color characteristics includes 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. 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. Oxide particles composed of any one oxide of an iron oxide, a cerium oxide, a cobalt zinc complex oxide, a silicon-cobalt-zinc-complex oxide, and a zinc oxide,
wherein a combination of the oxide particles, a ratio of M-OH bonds contained in the oxide particles and color characteristics of the oxide particles, is any one of the following a1 to e4:
a1: the oxide particles are iron oxide particles, the ratio of M-OH bonds contained in the oxide particles is 1.5% or more and 7.5% 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 1000 L/(mol·cm) or more;
a2: the oxide particles are iron oxide particles, the ratio of M-OH bonds contained in the oxide particles is 1.5% or more and 7.5% or less, and the average reflectance of the oxide particles for light rays at wavelengths of 780 nm to 2500 nm is 55% or more;
b1: the oxide particles are cerium oxide particles, the ratio of M-OH bonds contained in the oxide particles is 12.5% 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 200 nm to 380 nm is 3500 L/(mol·cm) or more;
b2: the oxide particles are cerium oxide particles, the ratio of M-OH bonds contained in the oxide particles is 11% 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 200 nm to 380 nm is 4000 L/(mol·cm) or more;
c1: the oxide particles are cobalt zinc complex oxide particles, the ratio of M-OH bonds contained in the oxide particles is 0.5% or more and 20% 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 200 nm to 380 nm is 700 L/(mol·cm) or more;
d1: the oxide particles are silicon-cobalt-zinc-complex oxide particles, the ratio of M-OH bonds contained in the oxide particles is 13% or more and 33% 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 200 nm to 380 nm is 800 L/(mol·cm) or more;
e1: the oxide particles are zinc oxide particles having a primary particle diameter of 50 nm or less, the ratio of M-OH bonds contained in the oxide particles is 12% 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 200 nm to 380 nm is 500 L/(mol·cm) or more;
e2: the oxide particles are zinc oxide particles having a primary particle diameter of 50 nm or less, the ratio of M-OH bonds contained in the oxide particles is 11.2% 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 200 nm to 380 nm is 650 L/(mol·cm) or more;
e3: the oxide particles are zinc oxide particles having a primary particle diameter of 50 nm or less, the ratio of M-OH bonds contained in the oxide particles is 12% or less, and the average reflectance of the oxide particles for light rays at wavelengths of 780 nm to 2500 nm is 65% or more; and
e4: the oxide particles are zinc oxide particles having a primary particle diameter of 50 nm or less, the ratio of M-OH bonds contained in the oxide particles is 12% or less, in a dispersion in which the oxide particles are dispersed in a dispersion medium, a transmittance for light rays at a wavelength of 330 nm is 10% or less, and an average reflectance for light rays at wavelengths of 380 nm to 780 nm is 90% or more.

2. The oxide particles according to claim 1 , wherein the primary particle diameter of the oxide particles is 100 nm or less.

3. The oxide particles according to claim 1 , wherein the haze value of an oxide dispersion obtained by dispersing the oxide particles in a dispersion medium is 1% or less.

4. A coating or film-like oxide composition comprising the oxide particles described in claim 1 .

5. A paint comprising the coating or film-like oxide composition according to claim 4 .

6. A coating film comprising the coating or film-like oxide composition according to claim 4 .

7. A vehicle equipped with the coating film according to claim 6 .

8. A coating or film-like oxide composition comprising the oxide particles composed of any one oxide of an iron oxide, a zinc oxide, and a cerium oxide,
wherein at least a part of a surface of the oxide particles is coated with a silicon compound,
wherein 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 a combination of the oxide particles, a ratio of M-OH bonds contained in the oxide particles and color characteristics of the oxide particles, is any one of the following f1 to h1:
f1: the oxide particles are iron oxide particles, 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 780 nm to 2500 nm is 50% or more;
f2: the oxide particles are iron oxide particles, the ratio of M-OH bonds contained in the oxide particles is 10% or more and 15% 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;
f3: the oxide particles are iron oxide particles, 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;
f4: the oxide particles are iron oxide particles, the ratio of M-OH bonds contained in the oxide particles is 8% or more and 15% or less, and hue H (=b*/a*) in an L*a*b* colorimetric system is in the range of 0.5 to 0.9;
f5: the oxide particles are iron oxide particles, the ratio of M-OH bonds contained in the oxide particles is 9% or more and 15% 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;
f6: the oxide particles are iron oxide particles, the ratio of M-OH bonds contained in the oxide particles is 9% more and 15% 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;
f7: the oxide particles are iron oxide particles, 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;
f8: the oxide particles are iron oxide particles, 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 15% 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%;
g1: the oxide particles are zinc oxide particles, the ratio of M-OH bonds contained in the oxide particles is 30% or more and 39% or less, and the average reflectance of the oxide particles for light rays at wavelengths of 780 nm to 2500 nm is 72% or more;
g2: the oxide particles are zinc oxide particles, the ratio of M-OH bonds contained in the oxide parti

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