Abstract: Desirable buff rutile pigment compositions are described which comprise about 40 to about 55% by weight of titanium, from about 0.4 to about 5 parts by weight of cobalt, from about 7 to about 14% by weight of tungsten, from 0.01 to about 5 parts by weight of lithium and from about 0.1 to about 20 parts by weight of cerium.

Abstract: Desirable high infra red reflecting brown rutile pigment compositions are described which comprise from about 40 to about 50% by weight of titanium, from about 2.3 to about 4.5% by weight of manganese, from about 7.3 to about 11% by weight of tungsten, from 0.05 to about 5% of lithium and from about 0.1 to about 20% of cerium.The invention also relates to the method of preparing the brown rutile pigment compositions and to the use of such pigments as colorants for polyvinyl halide compositions, and in particular, polyvinyl chloride compositions.

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.

Abstract: A new antimony-free yellow pigment is prepared by calcining anatase titanium dioxide with a limited quantitative combination of nickel, tungsten, zinc, lithium, cerium and magnesium compounds.