Molybdenum or tungsten containing bismuth vanadate yellow pigmen

Details Molybdenum or tungsten containing bismuth vanadate yellow pigmen Molybdenum or tungsten containing bismuth vanadate yellow pigmen

1981-02-23

1982-02-23

McCarthy, Helen M.

Compositions: coating or plastic

Materials or ingredients

423593, 106306, C09C 100

Patent

active

043167462

ABSTRACT:
This invention relates to new inorganic yellow pigments consisting or consisting essentially of Bi.sub.1-(x/3) M.sub.x V.sub.1-x O.sub.4 in which M is Mo or W.
The value of x varies from 0.075 to 0.317 in the case of Mo and from 0.059 to 0.265 in the case of W. These pigments are composed of only the tetragonal crystalline phase of the scheelite type when M is Mo; when M is W, also the orthorhombic crystalline phase .gamma.Bi.sub.2 WO.sub.6 is present.
These pigments may also contain a crystalline phase consisting of orthorhombic BaSO.sub.4 ; in such case the amount of BaSO.sub.4 may reach 80% by weight of the pigment.

REFERENCES:
patent: 4063956 (1977-12-01), Higgins
patent: 4115142 (1978-09-01), Hess
patent: 4230500 (1980-10-01), Balducci et al.
patent: 4272296 (1981-06-01), Balducci et al.

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