Production of improved chromium oxide green pigment

Details Production of improved chromium oxide green pigment Production of improved chromium oxide green pigment

1976-02-06

1978-01-10

Douglas, Winston A.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

423596, C09C 134

Patent

active

040677478

ABSTRACT:
A process for the production of chromium oxide green pigment comprising heating a mixture of ammonium dichromate with at least the stoichiometrically equivalent quantity of a sodium salt selected from the group consisting of chloride and sulfate over a period of at most about 15 minutes to a pigment-forming temperature of about 800 to 1100.degree. C in the presence of about 1 to 45% water based on the weight of the mixture, calcining the mixture at a temperature in the above-mentioned range, and separating the formed pigment from the salts. The mixture may be formed in situ by reaction of sodium dichromate with ammonium chloride or sulfate in the presence of water. The presence during calcining of organic modifiers such as sawdust or of boron compounds such as borax increases, tinting strength and disproportionately affect color. The pigments are brighter, and of higher tinting strength than heretofore produced.

REFERENCES:
patent: 1429912 (1922-09-01), d'Adrian
patent: 2156451 (1939-05-01), Grasshoff et al.
patent: 3278261 (1911-10-01), Kearley

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