Porous silica particle, method for producing the same, and cosmetic containing the same

Patent metadata

Field	Value
Publication number	US-9808407-B2
Application number	US-201515318431-A
Country	US
Kind code	B2
Filing date	Jun 30, 2015
Priority date	Jun 30, 2014
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

An object of the present invention is to provide a porous silica particle with the small specific surface area and the large pore volume, a method for producing the same, and a cosmetic containing the porous silica particle with such characteristics as the texture improver. The porous silica particle according to the present invention has a structure sparsely packed with silica microparticles. The mean particle diameter is 0.5 to 25 μm, the specific surface area measured by the BET method is 5 to 60 m 2 /cm 3 , and the pore volume is 0.35 to 2.0 ml/g. In the pore size distribution of the porous silica particles (X axis: pore diameter, Y axis: value obtained by differentiating the pore volume by the pore diameter), the most frequent pore diameter (D m ) satisfies 100<D m <4000 [nm].

First claim

The invention claimed is:

1. A porous silica particle comprising:
silica microparticles comprising:
a mean micro-particle diameter (d 2 ) of more than 100 nm and 1000 nm or less,
a sphericity of 0.85 to 1, and
a CV-value of less than 15%,

wherein the porous silica particle comprises:
a mean particle diameter (d 1 ) of 0.5 to 25 μm,
a specific surface area obtained by the BET method of 5 to 60 m 2 /cm 3 , and
a pore volume of 0.35 to 2.0 ml/g,
wherein in a pore size distribution (X axis: pore diameter, Y axis: value obtained by differentiating pore volume by pore diameter) of the porous silica particle, the minimum pore diameter (D 0 ) is in the range of 25 to 500 nm, the maximum pore diameter (D 100 ) is in the range of 300 to 8000 nm, and the ratio of the maximum pore diameter (D 100 ) to the minimum pore diameter (D 0 ), (D 100 /D 0 ), is in the range of 4 to 320.

2. The porous silica particle according to claim 1 , wherein in the pore size distribution (X axis: pore diameter, Y axis: value obtained by differentiating pore volume by pore diameter) of the porous silica particle, the most frequent pore diameter (D m ) satisfies 100 <D m <4000 [nm].

3. The porous silica particle according to claim 1 , further comprising inorganic oxide microparticles in the range of 10 to 50 wt %, the inorganic oxide microparticles containing at least one of titanium dioxide, iron oxide, and zinc oxide.

4. The porous silica particle according to claim 1 , wherein the silica microparticles mean micro-particle diameter (d 2 ) comprises the range of 0.01 to 0.30 times the mean particle diameter (d 1 ) of the porous silica particle.

5. A cosmetic comprising the porous silica particle according to claim 1 .

6. The porous silica particle according to claim 1 ,
wherein individual silica microparticles comprise a specific surface area obtained by the BET method of 5 to 60 m 2 /cm 3 and a pore volume of 0.35 to 2.0 ml/g; and
wherein the porous silica particle comprises a plurality of sparsely packed individual silica microparticles.

7. The porous silica particle according to claim 1 , wherein the porous silica particle is used in cosmetics.

8. A porous silica particle comprising silica microparticles, the porous silica particle comprising a mean particle diameter (d 1 ) of 0.5 to 25 μm, a specific surface area obtained by the BET method of 5 to 60 m 2 /cm 3 , and a pore volume of 0.35 to 2.0 ml/g wherein in a pore size distribution (X axis: pore diameter, Y axis: value obtained by differentiating pore volume by pore diameter) of the porous silica particle, the minimum pore diameter (D 0 ) is in the range of 25 to 500 nm, the maximum pore diameter (D 100 ) is in the range of 300 to 8000 nm, the ratio of the maximum pore diameter (D 100 ) to the minimum pore diameter (D 0 ), (D 100 /D 0 ), is in the range of 4 to 320, and a most frequent pore diameter (D m ) satisfies 100<D m <4000 nm.

Assignees

• Jgc Catalysts & Chemicals Ltd

Inventors

• Enomoto Naoyuki
• Watanabe Satoshi
• Miyoshi Yasutaka

Classifications

• A61Q1/12

  Face or body powders for grooming, adorning or absorbing · CPC title

• A61K8/25 Primary

  Silicon; Compounds thereof · CPC title

• A61Q1/02

  Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12) · CPC title

• A61K2800/412

  Microsized, i.e. having sizes between 0.1 and 100 microns · CPC title

• A61K8/29

  Titanium; Compounds thereof · CPC title