Antimony oxide pigment and process of manufacture

Details Antimony oxide pigment and process of manufacture Antimony oxide pigment and process of manufacture

1977-04-18

1978-02-21

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308B, C09C 100

Patent

active

040750329

ABSTRACT:
The present invention provides a process for the surface treatment of antimony oxide for use as a pigment in paints or plastics wherein a hydrous oxide or mixture of oxides is precipitated onto the antimony oxide pigment. Specifically, this invention concerns the precipitation of hydrous oxides of titania, alumina or silica. In operation, the pH of an aqueous slurry of antimony oxide is adjusted to be within a specified pH range and the coating of the antimony oxide is effected by adding an amount of the hydrous oxide to cause precipitation of the hydrous oxide upon the antimony oxide pigment. The present invention contemplates an improved antimony oxide pigment having a first coating of amorphous alumina and a second coating of boehmite alumina. The present invention also contemplates an improved antimony oxide pigment having a first coating of titania and a second coating of alumina.

REFERENCES:
patent: 2882178 (1959-04-01), Dunn, Jr. et al.
patent: 3545994 (1970-12-01), Lott, Jr. et al.
patent: 4022636 (1977-05-01), Murray

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