Gray-black encapsulated pigments and method for their preparatio

Details Gray-black encapsulated pigments and method for their preparatio Gray-black encapsulated pigments and method for their preparatio

1990-03-02

1991-05-28

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106439, 106450, 427215, C09C 162

Patent

active

050191691

ABSTRACT:
Gray-black pigments are prepared by encapsulating iron titanates of formula FeTiO.sub.3 in zirconium silicate crystals. Manufacture is by calcining a mixture of zirconium oxide having a particle size distribution of 6 to 10 .mu.m and a specific surface area of 2 to 5.2 m.sup.2 /g, silicon dioxide and iron and titanium oxides or Fe and Ti compounds forming oxides in the presence of mineralizers under oxidizing conditions at 800 to 1300.degree. C. Finely divided FeTiO.sub.3 can also be used.

REFERENCES:
patent: 3488204 (1970-01-01), Jordan et al.
patent: 3847639 (1974-11-01), Broll
patent: 4482390 (1984-11-01), Airey et al.
patent: 4788080 (1988-11-01), Hojo et al.
patent: 4874433 (1989-10-01), Kiss et al.

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