Metal chromate pigment compositions

Details Metal chromate pigment compositions Metal chromate pigment compositions

C - Chemistry, Metallurgy

09

C

6/194

C09C 1/20 (2006.01) C08K 9/04 (2006.01) C09C 1/08 (2006.01) C09C 1/34 (2006.01) C09C 3/00 (2006.01)

Patent

CA 1122356

IMPROVED METAL CHRONATE PIGMENT COMPOSITIONS Abstract of the Disclosure 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, by weight, from 50 to 85 % of a metal chromate-containing pigment selected from strontium, zinc or lead chromate, from 7.5 to 30 % of at least one water-insoluble zinc, aluminium, magnesium or calcium salt of a fatty acid containing at least 12 carbon atoms and from 7.5 to 20 % of at least one normally liquid ester plasticizer. 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.

329974

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