Porous silica particles and method for producing same

Patent metadata

Field	Value
Publication number	US-12134563-B2
Application number	US-201816954765-A
Country	US
Kind code	B2
Filing date	Dec 27, 2018
Priority date	Dec 27, 2017
Publication date	Nov 5, 2024
Grant date	Nov 5, 2024

Abstract

A porous silica particle has disintegration properties. The porous silica particle has an average particle diameter of 0.5 to 50 μm, a pore volume of 0.5 to 5.0 cm3/g, a mode of a pore diameter of 2 to 50 nm, a shape factor of 0.8 to 1.0, an average compression strength of 0.1 to less than 1.0 kgf/mm2, a sodium content of 10 ppm or less, and a network structure.

First claim

What is claimed is:

1. Porous silica particles having a network structure, satisfying (i) to (vi) below:
(i) the porous silica particles have an average particle diameter [μm] of 0.5 to 50,
(ii) the porous silica particles have a pore volume [cm 3 /g] of 0.5 to 5.0,
(iii) the porous silica particles have a mode of a pore diameter [nm] of 2 to 50,
(iv) the porous silica particles have an average shape factor of 0.8 to 1.0,
(v) the porous silica particles have an average compression strength [kgf/mm 2 ] of 0.1 to less than 1.0, and
(vi) the porous silica particles have a sodium content of 10 ppm or less, wherein a pore volume rate calculated from a total pore volume (V ±25% ) of pores having a pore diameter within ±25% of the mode and the pore volume (V), according to formula (1), is 40% or more:
pore volume rate (%)=( V ±25% /V )×100  (1).

2. The porous silica particles according to claim 1 ,
wherein the porous silica particles have a specific surface area of 30 to 400 m 2 /g.

3. The porous silica particles according to claim 1 , wherein
the porous silica particles that form the network structure include non-spherical particles,
wherein the non-spherical particles include silica fine particles having an average particle diameter of 5 to 50 nm which bind to each other, and
wherein the non-spherical particles have an average particle diameter of 50 to 500 nm.

4. The porous silica particles according to claim 3 ,
wherein a ratio (d 2 /d 1 ) between an average particle diameter (d 2 ) of the non-spherical particles and an average particle diameter (d 1 ) of the silica fine particles is 1.6 to 100.

Assignees

• Jgc Catalysts & Chemicals Ltd

Inventors

• Egami Miki
• Miyamoto Takuji
• Muraguchi Ryo

Classifications

• C01P2006/90

  Other properties not specified above · CPC title

• C01P2006/16

  Pore diameter · CPC title

• C01P2006/14

  Pore volume · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2004/32

  Spheres · CPC title