Bismuth vanadate pigments and process for preparing same

Details Bismuth vanadate pigments and process for preparing same Bismuth vanadate pigments and process for preparing same

1979-10-04

1981-02-17

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106288B, 106306, 106309, C09C 100, C09C 102, C09C 104

Patent

active

042512832

ABSTRACT:
New greenish-yellow pigments based on BiVO.sub.4 are disclosed. The pigments consist of the product obtained by the calcination, in the presence of air, of a mixture of BiPO.sub.4, V.sub.2 O.sub.5 and an oxide MeO, in which Me is Ca, Ba, Mg or Zn, said calcining being conducted at a temperature of between 500.degree. and 800.degree. C. when Me is Ca, Ba or Mg; and between 500.degree. and 700.degree. C. when Me is Zn, the calcination being then followed by a slow cooling down and by wet grinding. These pigments show a molar ratio Bi.sub.2 O.sub.3 /P.sub.2 O.sub.5 equal to 1 while their molar ratios Bi.sub.2 O.sub.3 /V.sub.2 O.sub.5 are within given ranges, which depend on the nature of Me.

REFERENCES:
patent: 4026722 (1977-05-01), Hess
patent: 4063956 (1977-12-01), Higgins
patent: 4115141 (1978-09-01), Piltingsrud
patent: 4115142 (1978-09-01), Hess

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