METALLIC CHROMATE PIGMENT COMPOSITIONS AND PROCESS FOR PREPARING THEM

摘要

Metal chromate and particularly lead chromate pigment compositions exhibiting low dusting characteristics and improved heat stability in thermoplastics are described. The pigment compositions consist essentially of a metal chromate-containing pigment and the combination of certain fatty acid salts with normally liquid ester plasticizers. Lead chromate pigment compositions containing the combination of a zinc salt of a fatty acid with benzoate, phthalate, stearate or phosphate plasticizers are particularly preferred and exhibit reduced dusting as well as outstanding advantages in heat stability not realizable with either the fatty acid salt or plasticizer alone or by silica encapsulation of the pigment particles.