公开(公告)号：US20210139709A1

公开(公告)日：2021-05-13

申请号：US16341280

申请日：2017-10-18

Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.

Inventor： Tsutomu YAMAMOTO ,  Hironobu OGATA ,  Hiroaki HAMAMURA ,  Masayuki ASADA

IPC: C09C3/12 ,  C09C1/00 ,  C09C3/08 ,  C08K9/06 ,  C08K9/04 ,  C08K3/30 ,  C09D7/62 ,  C09D7/40

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.

公开(公告)号：US20170320750A1

公开(公告)日：2017-11-09

申请号：US15524163

申请日：2015-11-06

Applicant: SAKAI CHEMICAL INDUSTRY CO., LTD.

Inventor： Masayuki ASADA

IPC: C01F11/46

CPC classification number: C01F11/462 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/20 ,  C01P2004/38 ,  C01P2004/61 ,  C01P2004/62 ,  C01P2004/80 ,  C01P2006/37 ,  C01P2006/62 ,  C01P2006/63 ,  C01P2006/64 ,  C01P2006/80 ,  C09C1/027

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 comprising 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×106×e(−0.015×t) A is 8 or more, and an upper limit of X is 3000 minutes in the formula.