Silica particle dispersion liquid

Patent metadata

Field	Value
Publication number	US-2025059053-A1
Application number	US-202418938417-A
Country	US
Kind code	A1
Filing date	Nov 6, 2024
Priority date	May 9, 2022
Publication date	Feb 20, 2025
Grant date	—

Abstract

The present invention relates to a silica particle dispersion including: hollow silica particles; and a solvent, in which the hollow silica particles have an average particle diameter in a range of 0.2 μm to 10 μm. The present invention relates to the silica particle dispersion in which the hollow silica particles have a particle density of 0.35 g/cm3 to 2.00 g/cm3, the particle density being determined by density measurement with a dry pycnometer using argon gas.

First claim

1 . A silica particle dispersion comprising: hollow silica particles; and a solvent, wherein the hollow silica particles have an average particle diameter in a range of 0.2 μm to 10 μm.

2 . The silica particle dispersion according to claim 1 , wherein the hollow silica particles have a particle density of 0.35 g/cm 3 to 2.00 g/cm 3 , the particle density being determined by density measurement with a dry pycnometer using argon gas.

3 . The silica particle dispersion according to claim 1 , wherein the hollow silica particles have a particle density of 2.00 g/cm 3 to 2.30 g/cm 3 , the particle density being determined by density measurement with a dry pycnometer using helium gas.

4 . The silica particle dispersion according to claim 1 , wherein the hollow silica particles have a BET specific surface area of 1 m 2 /g to 100 m 2 /g.

5 . The silica particle dispersion according to claim 1 , wherein the hollow silica particles have a sphericity of 0.75 to 1.0.

6 . The silica particle dispersion according to claim 1 , further comprising a silane compound having at least one group selected from the group consisting of a vinyl group, a phenyl group, a phenylamino group, an alkyl group having 4 or more carbon atoms, a methacrylic group, and an epoxy group.

7 . The silica particle dispersion according to claim 1 , further comprising an organic thixotropic agent.

8 . The silica particle dispersion according to claim 1 , wherein the solvent comprises at least one selected from the group consisting of water, hydrocarbons, alcohols, acetate esters, ketones, cellosolves, glycol ethers, chlorohydrocarbons, and polar solvents.

9 . The silica particle dispersion according to claim 1 , having a viscosity of 20 mPa·s to 20,000 mPa·s at 25° C. when a solid content concentration of the hollow silica particles is 50% by volume.

10 . A resin composition comprising the silica particle dispersion according to claim 1 .

11 . A method for producing a silica particle dispersion, the method comprising:
mixing a solvent and powder of hollow silica particles having an average particle diameter in a range of 0.2 μm to 10 μm; and subjecting the mixed liquid to a dispersion treatment, followed by classifying to remove aggregates of the hollow silica particles.

Assignees

• Agc Inc
• Agc Si Tech Co Ltd

Inventors

• KAMO Hiromichi

Classifications

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K2201/005

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

• C08K2201/006

  Additives being defined by their surface area · CPC title

• C01P2006/10

  Solid density · CPC title

• C01P2004/34

  hollow · CPC title