Treatment of pigment

Details Treatment of pigment Treatment of pigment

C - Chemistry, Metallurgy

09

C

6/206

C09C 3/00 (2006.01) C09C 1/36 (2006.01)

Patent

CA 1050210

TREATMENT OF PIGMENT ABSTRACT OF THE DISCLOSURE There is provided a process for the treatment of titanium dioxide pigment in such a manner that there becomes associated with the pigment a number of hydrous metal oxides or a phosphate so that the pigment, when incorporated in a paint, has a reduced photochemical activity. An aqueous dispersion of titanium dioxide is formed and contains as a dispersant 0.1% to 0.3% by weight of monoisopropanolamine, a water-soluble phosphate in an amount of from 0.05% to 0.5% by weight expressed as P2O5 or a mixture thereof, or a water- soluble silicate in an amount of 0.1% to 0.5% by weight expressed as SiO2 used alone or together with the monoiso- propanolamine or the phosphate or a mixture thereof. The next step is adding to the aqueous dispersion a water-soluble phosphate in an amount of 0.05% to 1.0% by weight expressed as P2O5 when the dispersing agent is not solely a phosphate, a water-soluble hydrolysable acidic compound of zirconium in an amount of from 0.2% to 2.5% by weight expressed as ZrO2, a water-soluble hydrolysable acidic compound of aluminium in an amount of from 0.2% to 2.5% by weight expressed as Al2O3, a water-soluble compound of silicon in an amount of from 0% to 1% by weight expressed as SiO2 and a water-soluble hydrolysable alkaline compound of aluminium in an amount of from 0.5% to 2.5% by weight expressed as Al2O3. The pH of the dispersion then is adjusted, if necessary, to a value of from 6.5 to 8 5 prior to recovering the treated pigment from the dispersion.

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