Pigments containing lead chromate

Details Pigments containing lead chromate Pigments containing lead chromate

C - Chemistry, Metallurgy

09

C

6/203

C09C 1/14 (2006.01) C07C 49/84 (2006.01) C09C 1/20 (2006.01) C09C 3/06 (2006.01)

Patent

CA 1065557

METHOD FOR THE MANUFACTURE OF A LEAD CHROMATE CONTAINING PIGMENT HAVING A LOW ACID SOLUBLE LEAD CONTENT ABSTRACT OF THE DISCLOSURE A process for the production of lead chromate- containing pigments such as the light chrome yellows and the molybdate oranges and reds having a low content of acid soluble lead, good color and tinting properties and excellent resistance to industrial environments is described. The process comprises forming a lead chromate-containing precipitate in acidic aqueous medium containing chloride ions and an excess of lead ions in the absence of a pH buffering agent, coating the precipitate with a silicon and antimony compound, adjusting the pH of the medium to below 7 and recovering, the coated precipitate as a pigment. -1-

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