Pigment process for durable pigments

Details Pigment process for durable pigments Pigment process for durable pigments

1997-02-27

1999-11-02

Bell, Mark L.

Compositions: coating or plastic

Materials or ingredients

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

106436, 106437, 106438, 106441, 106446, 106450, 106454, C09B 136

Patent

active

059762373

ABSTRACT:
Improved coated inorganic pigments having a first coating of Al.sub.2 O.sub.3, SiO.sub.2, or optionally other oxide such as a source of P.sub.2 O.sub.5, or mixtures thereof, an optional coating of ZrO.sub.2, SnO.sub.2, TiO.sub.2, SiO.sub.2, CeO.sub.2 or mixtures thereof, and a final coating of Al.sub.2 O.sub.3 which exhibit good durability, dispersibility, and optical properties in plastic or paint compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an inorganic pigment is milled to achieve a particular particle size distribution, a first coating of Al.sub.2 O.sub.3, SiO.sub.2, or optionally other oxide such as a source of P.sub.2 O.sub.5, or mixtures thereof is precipitated onto the pigment material within a first pH range, an optional amount of ZrO.sub.2, SnO.sub.2, SiO.sub.2, TiO.sub.2, CeO.sub.2 or mixtures thereof is added to the aqueous slurry within a second pH range to obtain an optional coating over the first coating, and a final coating of Al.sub.2 O.sub.3 is added over the prior coating(s).

REFERENCES:
patent: 3515566 (1970-06-01), Moody et al.
patent: 5332433 (1994-07-01), Story et al.
patent: 5607504 (1997-03-01), Schmid et al.
patent: 5650002 (1997-07-01), Bolt
patent: 5700318 (1997-12-01), Brand et al.

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