Patent ID: 6174360
Filing Date: 2001-01-16
Classification: C01P,C08K,C09C,C09D

Abstract:
A solid solution comprising a host component having the corundum-hematite crystalline structure, said host component comprising chrome oxide, and a guest component, said guest component being incorporated into the crystalline lattice structure of said host component, said guest component comprising metal oxides or precursors thereof having as cations the elements iron, aluminum, and titanium, said solid solution having a Y CIE tri-stimulus value below 14 as measured on a neat pressed cup powder sample using a Diano Matchscan II Spectrophotometer using a 1931 CIE 2 degree observer with a C Illuminant in accordance with the procedures set forth in ASTM Standard E308 (1996), Standard Practice for Computing the Colors of Objects by Using the CIE System, and a reflectance above 70% as measured on a neat pressed cup powder sample using a Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory at a wavelength of 2.5 .mu.m.