Amorphous silica-titania composite oxide powder, resin composition, liquid dispersion, and method for producing silica-coated silica-titania composite oxide powder

Patent metadata

Field	Value
Publication number	US-12209187-B2
Application number	US-202017618078-A
Country	US
Kind code	B2
Filing date	Jun 5, 2020
Priority date	Jun 12, 2019
Publication date	Jan 28, 2025
Grant date	Jan 28, 2025

Abstract

Amorphous silica-titania composite oxide powder is powder untreated with a surface treatment agent and consisting of amorphous silica-titania composite oxide particles, wherein: a refractive index at a measurement wavelength of 589 nm is not less than 1.46; a volume-based cumulative 50% diameter is 0.1 μm to 2.0 μm; and a content of particles having a particle size of not less than 5.0 μm is not more than 10 ppm, and wherein, in a case where the powder is dried in an atmospheric air at 110° C. for 12 hours, and powder thus dried is stored for 24 hours at a temperature of 25° C. and a relative humidity of 85% so as to absorb moisture, a water absorption rate is not more than 0.8% by mass as calculated from a mass X before moisture absorption and a mass Y after the moisture absorption in accordance with the formula: (Y−X)/X×100.

First claim

The invention claimed is:

1. Amorphous silica-titania composite oxide powder which is powder untreated with a surface treatment agent and consisting of amorphous silica-titania composite oxide particles,
wherein:
a refractive index of the particles as measured by immersion method at a measurement wavelength of 589 nm is not less than 1.46;
a volume-based cumulative 50% diameter as measured by laser diffractometry is in a range of 0.1 μm to 2.0 μm; and
a content of particles having a particle size of not less than 5.0 μm is not more than 10 ppm as measured by Coulter counter method, and

wherein, in a case where the silica-titania composite oxide powder is dried in an atmospheric air at 110° C. for 12 hours, and powder thus dried is stored for 24 hours under conditions of a temperature of 25° C. and a relative humidity of 85% so as to absorb moisture, a water absorption rate is not more than 0.8% by mass as calculated from a change in mass in accordance with the following formula:
water absorption rate=( Y−X )/ X× 100

where X is a mass before moisture absorption, and Y is a mass after the moisture absorption.

2. The amorphous silica-titania composite oxide powder as set forth in claim 1 , including:
a core consisting of a silica-titania composite oxide; and
a silica coating layer consisting of silica.

3. Surface-treated amorphous silica-titania composite oxide powder in which amorphous silica-titania composite oxide powder recited in claim 1 has been treated with a surface treatment agent.

4. A resin composition, comprising:
amorphous silica-titania composite oxide powder recited in claim 1 ; and
a resin.

5. A dispersion liquid in which amorphous silica-titania composite oxide powder recited in claim 1 is dispersed in a solvent.

Assignees

• Tokuyama Corp

Inventors

• Ariyuki Masao
• Tanaka Osamu
• Fukunaga Kazuhiro
• Aoki Mari

Classifications

• C09C3/063

  Coating · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08K9/02 Primary

  Ingredients treated with inorganic substances · CPC title

• C01P2004/84

  one phase coated with the other · CPC title

• C01P2004/62

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