Pigment consisting of a mixture of chromium oxide and iron oxide useful in high infra red reflectance gray vinyl composition
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United States of America Patent
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Nov 25, 1986
Grant Date -
N/A
app pub date -
Sep 30, 1985
filing date -
Sep 30, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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