Pigments stable at high temperatures

Details Pigments stable at high temperatures Pigments stable at high temperatures

C - Chemistry, Metallurgy

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C01G 49/00 (2006.01) C01G 3/00 (2006.01) C01G 11/00 (2006.01) C01G 45/00 (2006.01) C01G 51/00 (2006.01) C08K 3/24 (2006.01) C09C 1/22 (2006.01)

Patent

CA 1130984

PIGMENTS STABLE AT HIGH TEMPERATURES Abstract of the Invention A pigment capable of withstanding elevated tempera- tures such as 175°C is provided by the formation of a spinel of iron and other metal, such as Cu, Ca, Cd, Co, Ba, Sr, Mg, Mn, and Li. The pigment is made by a method which does not involve a step of calcining at high temperature, such as 600°C to 1100°C, but rather involves precipitation from aqueous solution and subsequent exposure to elemental oxygen, as by aeration, to form submicron-sized particles of desired spinel. Colors other than yellow may be obtained, and the spinels of Fe-Ba and Fe-Sr have magnetic properties.

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