Weather resistant titanium dioxide pigment having improved optic

Details Weather resistant titanium dioxide pigment having improved optic Weather resistant titanium dioxide pigment having improved optic

1979-03-26

1980-04-22

Poer, James

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

106308B, C09C 136

Patent

active

041993705

ABSTRACT:
A weather-resistant TiO.sub.2 pigment having improved optical properties is provided. The pigment is substantially encapsulated with a coating of an amorphous, dense silica in an amount between about 1% and about 7%; a coating of a voluminous silica in an amount between about 1% and about 8%; and preferably a coating of a precipitated alumina in an amount between about 2% and about 8%. In a particularly preferred embodiment the pigment further includes an innermost coating of a precipitated alumina in an amount between about 0.2 and 0.6%, the percentages of silica and alumina being calculated as % SiO.sub.2 and Al.sub.2 O.sub.3 by weight, based on the final treated TiO.sub.2 pigment. A process for manufacturing the pigment is further provided.

REFERENCES:
patent: 3928057 (1975-12-01), DeColibus
patent: 4075031 (1978-02-01), Allen

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