Sakai Chemical Industry Co., Ltd.

Masayuki Asada

Hiroyuki Izumikawa

Hironobu Ogata

Tsutomu Yamamoto

Hiroaki Hamamura

Yusuke Shimizu

Junichi Miyake

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.

Barium sulfate powder and resin composition comprising same

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&#xb0; C., wherein a retention time X (minutes) at a heat treatment temperature of t&#xb0; C. is more than time expressed by the following general formula: X (minutes)=A&#xd7;10&#xd7;e, where A is 8 or more, and an upper limit of X is 3000 minutes in the formula.

Method for producing barium sulfate powder and barium sulfate powder

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Fukushima, Japan

Masayuki Asada