Pigment consisting of a mixture of chromium oxide and iron oxide

Details Pigment consisting of a mixture of chromium oxide and iron oxide Pigment consisting of a mixture of chromium oxide and iron oxide

1985-09-30

1986-11-25

Lilling, Herbert J.

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

1062862, 1062863, 106302, 524407, 524567, C08K 320, C08K 310, C04B 1434, C09C 162

Patent

active

046247106

ABSTRACT:
This invention relates to a gray vinyl polymer material having improved tolerance to sunlight and other sources of infra red radiation. The vinyl polymer contains an inorganic pigment composed of chromium oxide (Cr.sub.2 O.sub.3) and iron oxide (Fe.sub.2 O.sub.3) wherein the weight ratio of the oxides is about 3:1. The pigment may be blended with titanium dioxide (TiO.sub.2) to give a continuous spectrum of shades ranging from dark gray to light gray. The pigment is prepared by co-calcining the oxides of chromium and iron in finely divided form (-325 mesh) at a relatively low (900.degree.-950.degree. C.) temperature followed by grinding of the co-calcined product to 99% -325 mesh.

REFERENCES:
patent: 3528839 (1970-09-01), Weber
patent: 3561989 (1971-02-01), Weber
patent: 4205996 (1980-06-01), Eppler
patent: 4424292 (1984-01-01), Ravinovitch et al.
patent: 4457784 (1984-07-01), Bernhard

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