Inorganic pigments and method for preparing same

Details Inorganic pigments and method for preparing same Inorganic pigments and method for preparing same

1979-08-22

1980-10-28

McCarthy, Helen M.

Compositions: coating or plastic

Materials or ingredients

106 734, 423306, 423593, C09C 100

Patent

active

042305004

ABSTRACT:
There are disclosed new greenish-yellow, yellow and orange-yellow pigments which consist substantially of bismuth vanadate of monoclinic structure, bismuth phosphate of monoclinic structure and aluminum phosphate of orthorhombic structure and which, in the case of the yellow and orange-yellow pigments, also comprise a compound based on Bi.sub.2 O.sub.3 and V.sub.2 O.sub.5 the X-rays diffraction pattern of which shows the following peaks: 1.87, 1.88, 2.41, 2.77, 2.80, 3.11, 3.82 and 7.6 A. The new pigments are characterized by a dominant wave length .lambda..sub.D of from 573 to 586 m.mu., and have a molar ratio of Bi.sub.3 O.sub.3 /P.sub.2 O.sub.5 equal to 1, and a Bi.sub.2 O.sub.3 /V.sub.2 05 molar ratio of from 1.39 to 5.59, inclusive, while their molar ratio Al.sub.2 O.sub.3 /V.sub.2 O.sub.5 lies within specified ranges of values. Also disclosed is a method for preparing the new pigments by calcining, in the presence of air, BiPO.sub.4, Al.sub.2 O.sub.3 and V.sub.2 O.sub.5 or compounds which generate Al.sub.2 O.sub.3 and V.sub.2 O.sub.5 during the calcination.

REFERENCES:
patent: 4026722 (1977-05-01), Hess
patent: 4115141 (1978-09-01), Piltingsrud

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