Lead chromate pigment with improved thermal stability

Details Lead chromate pigment with improved thermal stability Lead chromate pigment with improved thermal stability

1976-10-07

1977-11-22

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106308B, 427215, C09C 120, C09C 306

Patent

active

040594599

ABSTRACT:
Dense silica-coated lead chromate pigment prepared by adding from 0.2% to 1% by weight of a soluble silicate compound to an aqueous solution of chromate, and, optionally, at least one of sulfate and molybdate, contacting the aqueous solution with an aqueous lead salt to precipitate the base lead chromate pigment, treating the pigment with at least one hydrous oxide, and applying from 2% to 40% by weight of dense, amorphous silica to the treated lead chromate pigment. The resulting dense silica-coated lead chromate pigment exhibits higher thermal stability in plastics than conventional dense silica-coated lead chromate pigment.

REFERENCES:
patent: 2030009 (1936-02-01), Lederle
patent: 2365171 (1944-12-01), Botti
patent: 3370971 (1968-02-01), Linton

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