Method for making grey-black inclusion pigments

Details Method for making grey-black inclusion pigments Method for making grey-black inclusion pigments

1992-03-12

1993-04-27

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106400, 106401, 106472, 106475, 106481, C08K 336, C08K 304

Patent

active

052058662

ABSTRACT:
Gray-black inclusion pigments are made using zirconium silicate as the encasing substance and carbon black particles as the inclusion phase by annealing a mixture of zirconium dioxide, a source for silicon dioxide, carbon black and mineralizers under reducing conditions at 900.degree.-1400.degree. C. The process uses zeolites with an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of more than 4, preferably more than 10, as the SiO.sub.2 source. The depth of the color can be increased by also using an adhesion agent, especially silicon oil. The use of the zeolites facilities the employment of different zirconium dioxide qualities and permits the production of pigments with higher carbon black inclusion rates.

REFERENCES:
patent: 3189475 (1965-06-01), Marquis et al.
patent: 4047970 (1977-09-01), Morriss et al.
patent: 4482390 (1984-11-01), Airey et al.
patent: 4874433 (1989-10-01), Kiss et al.
patent: 5008223 (1991-04-01), Speer et al.
Somasundaran, P. "Theories of Grinding" in: Onoda, Jr. et al. (ed.) Ceramic Processing Before Firing (New York, John Wiley & Sons, 1978), p. 116.

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