Barium sulfate powder and resin composition comprising same

Patent metadata

Field	Value
Publication number	US-11434378-B2
Application number	US-201716341280-A
Country	US
Kind code	B2
Filing date	Oct 18, 2017
Priority date	Oct 28, 2016
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

The present invention relates to fine barium sulfate powder that can be readily and simply dispersed in resins or solvents; a resin composition, a coating composition, an ink composition, and a resin molded article each containing the barium sulfate powder; and a method for producing the barium sulfate powder. Provided is barium sulfate powder having a number average primary particle size of 1 to 100 nm, the powder including an organic compound on its surface, the powder in the form of compressed compact having a contact angle with distilled water of 10 to 170 degrees.

First claim

The invention claimed is:

1. A barium sulfate powder
having a number average primary particle size of 1 to 100 nm,
the powder comprising an organic compound on its surface,
the powder in the form of a compressed compact having a contact angle with distilled water of 10 to 170 degrees, and
the powder having a bulk specific gravity of 0.6 g/cm 3 or less.

2. A resin composition comprising:
the barium sulfate powder according to claim 1 ; and
a resin.

3. The resin composition according to claim 2 ,
wherein the resin is at least one thermoplastic resin selected from the group consisting of polyvinyl chloride, polyethylene resins, polyester resins, polyamide resins, and polyacrylic resins.

4. A coating composition or an ink composition comprising the resin composition according to claim 2 .

5. A resin molded article comprising the resin composition according to claim 2 .

6. The resin molded article according to claim 5 , wherein the number of barium sulfate agglomerates with a size of 10 μm or more is not more than 10 in a field of view of 1 mm 2 of a scanning electron micrograph of the resin molded article.

7. The barium sulfate powder of claim 1 , wherein the surface of the barium sulfate powder further comprises an organic compound having a C4 or shorter chain selected from the group consisting of trimethylolethane, trimethylolpropane, monomethanolamine, diethanolamine, or trimethanolamine.

8. The barium sulfate powder of claim 1 , wherein the surface of the barium sulfate powder further comprises an inorganic compound selected from the group consisting of alumina, aluminum hydroxide, zinc oxide, silica, hydrous alumina, and hydrous silica.

9. The barium sulfate powder of claim 1 , wherein the organic compound has a C4 or longer carbon chain and/or a siloxane bond.

10. A method for producing a barium sulfate powder, comprising:
adding an organic compound to a slurry containing a barium sulfate substrate having a number average primary particle size of 1 to 100 nm,
wherein the powder comprises an organic compound on its surface,
the powder in the form of a compressed compact has a contact angle with distilled water of 10 to 170 degrees, and
the powder has a bulk specific gravity of 0.6 g/cm 3 or less.

11. The method for producing barium sulfate powder according to claim 10 ,
wherein the amount of the organic compound is 2 to 20 parts by weight per 100 parts by weight of the barium sulfate substrate.

12. A method for producing barium sulfate powder, comprising:
adding an organic compound that has a C4 or longer carbon chain and/or a siloxane bond to a slurry having a temperature of 40° C. to 100° C. and containing a barium sulfate substrate having a number average primary particle size of 1 to 100 nm, wherein
the powder comprises an organic compound on its surface,
the powder is in the form of a compressed compact has a contact angle with distilled water of 10 to 170 degrees, and
the powder has a bulk specific gravity of 0.6 g/cm 3 or less.

13. The method for producing barium sulfate powder according to claim 12 ,
wherein the amount of the organic compound is 2 to 20 parts by weight per 100 parts by weight of the barium sulfate substrate.

Assignees

• Sakai Chemical Industry Co

Inventors

• Yamamoto Tsutomu
• Ogata Hironobu
• Hamamura Hiroaki
• Asada Masayuki

Classifications

• C01P2006/63

  a* (red-green axis) · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C09D177/00

  Coating compositions based on polyamides obtained by reactions forming a carboxylic amide link in the main chain (based on polyhydrazides C09D179/06; based on polyamide-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• C08K9/06

  with silicon-containing compounds · CPC title

• C09D7/62

  modified by treatment with other compounds · CPC title