White pigments zirconium oxide

Although arkelite is not known to have been used specifically as a pigment, zirconium oxide q.v ) is hstedby the Colour Index (1971) as Cl 77990/Pigment White 12. 

Cobalt. Without a doubt cobalt 2-ethyIhexanoate [136-52-7] is the most important and most widely used drying metal soap. Cobalt is primarily an oxidation catalyst and as such acts as a surface or top drier. Cobalt is a transition metal which can exist in two valence states. Although it has a red-violet color, when used at the proper concentration it contributes very Httie color to clear varnishes or white pigmented systems. Used alone, it may have a tendency to cause surface wrinkling therefore, to provide uniform drying, cobalt is generally used in combination with other metals, such as manganese, zirconium, lead, calcium, and combinations of these metals. 

Titanium white pigments, commercial production of, 19 388 Titanium white rutile pigment, 19 391 Titanium zinc oxide, 5 603 Titanium-zirconium-molybdenum (TZM) alloy, 17 14-15 Titanocene, 25 118 Titanocene catalysts, 16 19 Titanocene dichloride, 25 105 Titanocene synthons, 25 116 Titanocycles, 25 116... 

Zinc oxide (ZnO) is widely used as an active filler in rubber and as a weatherability improver in polyolefins and polyesters. Titanium dioxide (TiOj) is widely used as a white pigment and as a weatherability improver in many polymers. Ground barites (BaS04) yield x-ray-opaque plastics with controlled densities. The addition of finely divided calcined alumina or silicon carbide produces abrasive composites. Zirconia, zirconium silicate, and iron oxide, which have specific gravities greater than 4.5, are used to produce plastics with controlled high densities. 

Zirconium oxide n. Zr02. Pigment white 12 (77990). A natural mineral, baddeleyite. Present commercial grades are unsuitable as pigment grade in paint vehicles. Density, 5.68 g/cm particle size, 1.0-2.0 pm refractive index, 2.1-2.2. Syn zirconium dioxide, zirconia, and bad-deleyite. 

Zirconium oxide is used for making sanitary ware white and opaque. The oxide has also been used in place of TiO as the pigment for white camouflage paints for use in snow environments. ZrO simulates snow more closely in the infrared and microwave spectrum. 

Zirconia zor- ko-ne-o n [NL, fr. ISV zircon] (1797) (zirconium oxide) Zr02. A white monoclinic powder used as a pigment when good electrical properties are required. Kirk-Othmer Encyclopedia of Chemical Technology Pigments-Powders, John Wiley and Sons, New York, 1996). 

Although natural baddeleyite has not been identified as a pigment, its S3mthetic equivalent, zirconium oxide (. v.), is listed as Cl 77990/Pigment White 12. 

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