Method of producing surface-treated barium sulfate

Details Method of producing surface-treated barium sulfate Method of producing surface-treated barium sulfate

1984-12-31

1985-11-05

Kight, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

106308B, 106291, 106308Q, C09C 128, C01G 2306

Patent

active

045514976

ABSTRACT:
A method of producing surface-treated barium sulfate is disclosed which has an improved dispersibility in resins and coating compositions. The method comprises adding an aqueous solution of an alkali silicate to an aqueous slurry of barium sulfate which contains barium ion in excess to deposit barium silicate on the surface of barium sulfate, and then adding to the slurry a mineral acid to decompose the barium silicate to hydrous silica. The thus surface-treated barium sulfate may be further coated with hydrous metal oxides such as alumina or with a silane coupling agent so as to have a more improved dispersibility.

REFERENCES:
patent: 3840381 (1974-10-01), Watanbe

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