Pigments stable at high temperatures

Details Pigments stable at high temperatures Pigments stable at high temperatures

1980-04-28

1981-09-15

Carter, Herbert T.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252 6263, 106301, 106304, C01G 4100

Patent

active

042897459

ABSTRACT:
A pigment capable of withstanding elevated temperatures such as 175.degree. 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.degree. C. to 1100.degree. 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.

REFERENCES:
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patent: 3075919 (1963-01-01), Gruber et al.
patent: 3822210 (1974-07-01), Iwase et al.
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patent: 3887479 (1975-06-01), McLain
patent: 3904421 (1975-09-01), Slimizer
patent: 4025449 (1977-05-01), Pezzoli et al.
patent: 4075029 (1978-02-01), Nuss
patent: 4097392 (1978-06-01), Goldman et al.

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