The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2019
Filed:
Nov. 06, 2015
Sakai Chemical Industry Co., Ltd., Osaka, JP;
Masayuki Asada, Fukushima, JP;
SAKAI CHEMICAL INDUSTRY CO., LTD., Sakai-shi, Osaka, unknown;
Abstract
It is an object of the present disclosure to provide a method for inexpensively producing a high-performance barium sulfate powder which is obtained by using inexpensive barium sulfide as a raw material, has a high whiteness degree, and can suppress the generation of volatile components. A method for producing a barium sulfate powder comprises a step of heat treating a raw barium sulfate powders obtained by using barium sulfide as a raw material at 600 to 1300° C., wherein a retention time X (minutes) at a heat treatment temperature of t° C. is more than time expressed by the following general formula: X (minutes)=A×10×e, where A is 8 or more, and an upper limit of X is 3000 minutes in the formula.