Ferro Corporation

Christine J Byrne

Robert P Blonski

John J Welch

John J Maloney

Ivan H Joyce

Richard A Pipoly

This invention relates to a process for making a bismuth-vanadium-molybdenum-containing composition comprising: (A) preparing three separate aqueous compositions comprising: a first aqueous composition having a pH in the range of about 0.5 to about 4; a second aqueous composition comprising bismuth and having a pH in the range of about 0.2 to about 3; and a third aqueous composition comprising at least one salt of vanadium and at least one salt of molybdenum and having a pH in the range of about 9 to about 14; (B) adding said second aqueous composition and said third aqueous composition simultaneously to said first aqueous composition to form a fourth aqueous composition, and maintaining said fourth aqueous composition at a temperature in the range of about 30.degree.C. to about 90.degree.C. for up to about 4 hours, said fourth aqueous composition comprising precipitated solids; (C) separating said solids from said fourth aqueous composition; and (D) heating said solids at a temperature in the range of about 250.degree.C. to about 675.degree.C. for about 0.5 to about 30 hours to provide said bismuth-vanadtum-molybdenum-containing composition. This invention also relates to bismuth-vanadium-molybdenum-containing compositions made by the foregoing process, and to colored compositions containing such bismuth-vanadium-molybdenum-containing compositions.

Process for making bismuth-vanadium-molybdenum-containing compositions

This invention relates to colorants represented by the formula

Bismuth-containing colorants

A method for the synthesis of mixed metal oxide crystalline powders comprises the steps of preparing a raw material mixture containing at least two different metal cations; adding a template material to the mixture and blending it therewith; initiating formation of a mixed metal oxide by calcination of the mixture and the template material, whereby particles of the mixed metal oxides are formed; and thereafter recovering the mixed metal oxide particles. Mixed metal oxide crystalline powders comprise a template material; and metal oxides which form pigment classes of material containing the template material, the pigment classes being selected from the group consisting of borate, garnet, olivine, phenacite, phosphate, priderite, pyrochlore, sphene, spinel and zircon, as well as perovskite crystal classes of material containing the template, all of which have a uniform particle morphology and particle size ranging between about 0.2 to 100.mu. with minimal comminution.

Growing community of inventors

Olmsted Township, OH, United States of America

Christine J Byrne