Preparation of thermally stable lead chromate pigments

Details Preparation of thermally stable lead chromate pigments Preparation of thermally stable lead chromate pigments

1984-06-28

1985-07-23

Lieberman, Paul

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

1062873, 106306, C08K 300

Patent

active

045307253

ABSTRACT:
Thermally stable lead chromate pigments or pigments containing lead chromate, which have high color strength and are provided with a precipitated coating containing silicon dioxide, are prepared by a process in which an aqueous pigment suspension is mixed once or several times with an aqueous MgSiF.sub.6 solution, the pH being maintained at 4.5-9.5 and the temperature at 50.degree.-95.degree. C., and the pigment is then separated off and worked up, these steps being carried out in a conventional manner.

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patent: 4054465 (1977-10-01), Ziobrowski
patent: 4059459 (1977-11-01), Higgins
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