# US 2019/0375652 A1 · Barium sulfate spherical composite powder and method for producing same

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- Number: US 2019/0375652 A1
- Document ID: US20190375652A1
- Status: Published application
- Kind: A1
- Application number: 16/487,740
- Filed: 2018-02-07
- Published: 2019-12-12
- Earliest claimed: 2017-02-24
- Assignees: Sakai Chemical Industry Co., Ltd.
- Applicants: Sakai Chemical Industry Co., Ltd.
- Inventors: Satoshi KAMADA; Takuro ASHIDA
- Web page: https://patentgrep.com/patent/US20190375652A1

## CPC

- A61K 8/025: {Explicitly spheroidal or spherical shape}
- C01F 11/462: {Sulfates of Sr or Ba}
- A61K 8/23: Sulfur; Selenium; Tellurium; Compounds thereof
- A61K 8/25: Silicon; Compounds thereof
- A61Q 1/02: Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12)
- A61Q 17/04: Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
- C01B 33/18: 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)
- C01F 11/00: Compounds of calcium, strontium, or barium (C01F7/00 takes precedence)
- C09C 1/0081: {Composite particulate pigments or fillers, i.e. containing at least two solid phases, except those consisting of coated particles of one compound (C09C1/0015, C09C1/0078 take precedence)}
- C09C 1/027: {Barium sulfates}
- C09C 1/30: Silicic acid
- C09C 1/40: Compounds of aluminium {(C09C1/0009, C09C1/0015, C09C1/0078, C09C1/32 take precedence)}
- A61K 2800/412: Microsized, i.e. having sizes between 0.1 and 100 microns
- C01P 2002/54: one element only
- C01P 2002/85: by XPS, EDX or EDAX data
- C01P 2004/03: obtained by SEM
- C01P 2004/32: Spheres
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2004/80: Particles consisting of a mixture of two or more inorganic phases
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## 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).

## Claims

### Claim 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).

### Claim 2 (depends on 1)

The method according to claim 1,
wherein the particulate barium sulfate and the silica in the slurry have a mass ratio (BaSO4/SiO2) of 99/1 to 55/45.

### Claim 3 (depends on 1)

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.

### Claim 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 μm,
a haze of 50% or more, and
a silica content of 1 to 45% by mass.

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 4)

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