Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1990-03-02
1991-04-16
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106472, 106474, 106475, 427215, C09C 162, C09C 148
Patent
active
050082230
ABSTRACT:
The grayish-black encapsulated pigments contain carbon black particles with specific surface areas of 10 to 1000 m.sup.2 /g (BET) encapsulated in colorless crystals of zirconium silicate. In order to produce the pigments, mixtures of zirconium oxide with a particle size distribution (D50 values) between 7 and 10 .mu.m and a spec. surface between 2 and 4 m.sup.2 /g, silicon oxide, carbon black and mineralizers are heated under reducing conditions to 900.degree. to 1400.degree. C. and calcined for 0.5 to 8 hours and recalcined under oxidizing conditions to remove the non-included carbon black. The encapsulated pigments of the invention are suitable for the pigmented coloration of glazes.
REFERENCES:
patent: 3488204 (1970-01-01), Jordan et al.
patent: 4482390 (1984-11-01), Airey et al.
patent: 4788080 (1988-11-01), Hojo et al.
patent: 4874433 (1989-10-01), Kiss et al.
Hanich Juergen
Kiss Akos
Kleinschmit Peter
Speer Dietrich
Bell Mark L.
Degussa - Aktiengesellschaft
Jones Deborah
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