Barium sulfate spherical composite powder and method for producing same

Patent metadata

Field	Value
Publication number	US-10759672-B2
Application number	US-201816487740-A
Country	US
Kind code	B2
Filing date	Feb 7, 2018
Priority date	Feb 24, 2017
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

The present invention provides a barium sulfate spherical composite powder that has significantly high strength and excellent texture, and achieves high haze while maintaining high total light transmittance, and a method for producing such a composite powder. The present invention relates to a method for producing a barium sulfate spherical composite powder, which is a method for producing a spherical composite powder of barium sulfate and silica, the method comprising the steps of (1) preparing a slurry containing particulate barium sulfate and a silica sol, (2) spray-drying the slurry, and (3) firing a dry substance obtained in the step (2).

First claim

The invention claimed is:

1. A method for producing a barium sulfate spherical composite powder, which is a method for producing a spherical composite powder of barium sulfate and silica, the method comprising the steps of:
(1) preparing a slurry containing particulate barium sulfate and a silica sol;
(2) spray-drying the slurry; and
(3) firing a dry substance obtained in the step (2).

2. The method according to claim 1 ,
wherein the particulate barium sulfate and the silica in the slurry have a mass ratio (BaSO 4 /SiO 2 ) of 99/1 to 55/45.

3. The method according to claim 1 ,
wherein the firing in the step (3) is performed at a firing temperature of 400° C. to 1000° C.

4. A barium sulfate spherical composite powder which is a spherical composite powder comprising barium sulfate and silica,
the composite powder having
an average particle size of 0.5 to 100
a haze of 50% or more,
a silica content of 1 to 45% by mass, and
a sphericity of 1.0 to 1.5.

5. The barium sulfate spherical composite powder according to claim 4 ,
wherein the composite powder contains a layer surface-treated with a water-repellent organic compound.

6. A cosmetic product comprising the barium sulfate spherical composite powder according to claim 4 .

Assignees

• Sakai Chemical Industry Co

Inventors

• Kamada Satoshi
• Ashida Takuro

Classifications

• A61Q17/04

  Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations · CPC title

• A61Q1/10

  for eyes, e.g. eyeliner, mascara · CPC title

• C01B33/18

  Preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof (preparation of aerogels by dehydrating gels C01B33/158; treatment to enhance the pigmenting or filling properties C09C) · CPC title

• A61K8/25

  Silicon; Compounds thereof · CPC title

• A61Q1/04

  for lips · CPC title