Compositions: coating or plastic – Materials or ingredients – Miscellaneous
Patent
1982-09-30
1984-05-08
McCarthy, Helen M.
Compositions: coating or plastic
Materials or ingredients
Miscellaneous
106308B, 106309, C09C 136
Patent
active
044472714
ABSTRACT:
Titanium dioxide pigment having a high durability when used in paints comprises a particulate core of rutile titanium dioxide having an inner coating of dense amorphous silica on which is carried an outer coating of a hydrous oxide of zirconium. Optionally the pigment has an outer coating of a hydrous oxide of aluminum.
The amount of dense amorphous silica is up to 12% by weight expressed as SiO.sub.2 and the amount of hydrous oxide of zirconium is up to 5% expressed as ZrO.sub.2 on the weight of TiO.sub.2. The outer coating of hydrous oxide of aluminium can be present in an amount of up to 6% by weight expressed as Al.sub.2 O.sub.3 on the weight of TiO.sub.2.
A combination of these coatings has been found to be extremely advantageous in producing a paint containing the pigment having a very good durability and resistance to weathering.
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.
Howard Peter B.
O'Donnell Derek
McCarthy Helen M.
Tioxide Group PLC
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