| 摘要 |
Lead chromate-containing pigments having improved dispersibility, heat stability and resistance to abrasion in thermoplastic systems are described. The improved pigments of this invention comprise silica coated lead chromate-containing pigment particles having absorbed on their coated surfaces from 1 to 15% based on the weight of the coated particles of certain liquid organopolysiloxanes. The pigments are produced by contacting silica-coated lead chromate-containing pigment particles with the desired amount of the liquid organopolysiloxane and recovering the resulting particles, both of the contacting and recovery steps being carried out under conditions which do not effect substantial polymerization or curing of the organopolysiloxane.
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