Process for granulating lead chromate-containing pigments

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

1977-08-22

1978-11-28

Derrington, James H.

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106308M, 106309, 260 4255, C08K 910

Patent

active

041274210

ABSTRACT:
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 a lead chromate-containing pigment, a friable, low molecular weight hydrocarbon-type resin softening at 50.degree.-95.degree. 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.degree. to about 20.degree. 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.

REFERENCES:
patent: 3586654 (1971-06-01), Lerman et al.
patent: 3755244 (1973-08-01), Hart
patent: 3773535 (1973-11-01), Burgyan et al.

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