Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1990-06-26
1992-11-24
Buffalow, Edith
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
106438, 106443, 106600, B32B 516
Patent
active
051659956
ABSTRACT:
The object of the invention is a process for coating a titanium dioxide pigment according to which a dispersion of titanium dioxide in water is formed, optionally in the presence of a dispersing agent, such as a water soluble silicate and/or an aminoalcohol, whereafter to the titanium dioxide pigment dispersion (1) an acidic hydrolysable titanium compound in an amount of 0.1 to 1.5% by weight calculated as TiO.sub.2, (2) a water soluble phosphate in an amount of 0.1 to 1.0% by weight calculated as P.sub.2 O.sub.5, (3) an acidic hydrolysable zirconium salt in an amount of 0.1 to 1.4% by weight calculated as ZrO.sub.2, is added, the slurry is made alkaline with a base, and (4) a water soluble hydrolysable alkaline aluminium compound is added in an amount of 0.5 to 5.5% by weight calculated as Al.sub.2 O.sub.3, whereby all the percentages by weight are calculated from the weight of the TiO.sub.2 -pigment and the alkaline slurry formed is neutralized with an acid and the coated titanium dioxide pigment is recovered. The produced pigment has excellent gloss and weather resistance properties.
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patent: 4328040 (1982-05-01), Panek et al.
patent: 4447271 (1984-05-01), Howard et al.
Buffalow Edith
Kemira Oy
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