| 摘要 |
<p>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.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 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.</p> |
