C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
23/126, 23/224,
C09C 1/00 (2006.01) C01B 13/36 (2006.01) C01B 17/20 (2006.01) C01B 19/00 (2006.01) C09C 1/34 (2006.01)
Patent
CA 2007949
Abstract of the Disclosure A pigment of irregular-shaped particles is described which comprises crystallites of the empirical formula AxByCz wherein A and B are different; A is cobalt, nickel, copper, zinc, cadmium, iron, manganese or any combination thereof; B is aluminum, chromium, molybdenum, iron, vanadium, manganese or any combination thereof; C is oxygen, selenium, tellurium or sulfur; x is 1, 2 or 3; y is 2 or 3; and z is greater than 3; the crystallites have an average size of from about 75 to about 600 Angstroms; and the surface area of the pigment particles is greater than zero up to about 20 m2/g. In one embodiment, when the pigment contains a mixture of copper oxide, iron oxide, manganese oxide and no chromium, the pigment contains no more than 10% of manganese, and when the pigment contains copper oxide, chromium oxide, and manganese oxide, the pigment con- tains up to about 5% of manganese oxide, the mole ratio of chromium to copper is no greater than about 1.3 to 1. A process for preparing such pigments also is described which comprises the steps of (1) reacting a soluble salt of A and a soluble acid or acid salt of B with a soluble base in water to form a precipltate, provided that when C is Se, Te or S, the reaction is conducted in the presence of a soluble Se, Te or S compound, (2) recovering the precipitate, (3) calcining the precipitate at a temperature of from about 500 to about 1200°C, and (4) comminuting the calcined precipitate in a fluid-energy mill wherein the particles are reduced in size by particle- to-particle contact.
Gall Mark E.
Palka Eugene
Roberts Brian D.
Sullivan Thomas J.
Thakur Deepak S.
Engelhard Corporation
Gall Mark E.
Palka Eugene
Roberts Brian D.
Sim & Mcburney
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