Pigments and their preparation by coating with oxides of Zr-Si-A

Details Pigments and their preparation by coating with oxides of Zr-Si-A Pigments and their preparation by coating with oxides of Zr-Si-A

1982-09-30

1984-05-08

McCarthy, Helen M.

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308B, 106309, C09C 136

Patent

active

044472706

ABSTRACT:
Titanium dioxide pigment of improved durability in paints comprises a particulate core of rutile titanium dioxide having an inner coating on the core of an oxide or hydrous oxide of zirconium, and a coating of dense amorphous silica on the inner coating. The pigment optionally has an outer coating of a hydrous oxide of aluminium.
The pigments contain the oxide of hydrous oxide of zirconium in an amount of up to 5% expressed as ZrO.sub.2 and an amount of dense amorphous silica of up to 12% by weight expressed as SiO.sub.2 on the weight of TiO.sub.2.
The pigments when incorporated in paints have extremely high durability.

REFERENCES:
patent: Re27818 (1973-11-01), Werner
patent: 2885366 (1959-05-01), Iler
patent: 3552995 (1971-01-01), Powell
patent: 3650793 (1972-03-01), Goodspeed et al.
patent: 4125412 (1978-11-01), West
patent: 4222789 (1980-09-01), Jacobson
patent: 4328040 (1982-05-01), Panek et al.

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