Process for granulating lead chromate-containing pigments

Details Process for granulating lead chromate-containing pigments Process for granulating lead chromate-containing pigments

C - Chemistry, Metallurgy

09

C

18/502, 117/48.1

C09C 1/20 (2006.01) C08J 3/22 (2006.01) C08K 9/04 (2006.01) C09C 3/04 (2006.01)

Patent

CA 1113315

Abstract of the Disclosure A process is described for the production of high yields of lead chromate-containing pigments in a nondusting granular form. The process involves agitating in aqueous medium designated amounts of lead chromate-containing pigment, a friable, low molecular weight hydrocarbon-type resin softening at 50-95°C. and a cationic surfactant at a temperature above the softening point of the resin and continuing agitation at a temperature within the range of about 5 to about 20°C. above the softening point of the resin until the pigment dispersion is granulated. The process provides yields of at least 70% of granules in the particle size range of about 0.1 to about 4 millimeters. The granules are particularly useful as colorants for air-drying enamel coating systems and plastics.

308814

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