Production of readily dispersible titanium dioxide pigments...

Details Production of readily dispersible titanium dioxide pigments... Production of readily dispersible titanium dioxide pigments...

C - Chemistry, Metallurgy

09

C

117/48.1

C09C 1/36 (2006.01) B01J 13/02 (2006.01) C08K 9/10 (2006.01) C09C 3/10 (2006.01)

Patent

CA 1139999

ABSTRACT PRODUCTION OF READILY DISPERSIBLE TITANIUM DIOXIDE PIGMENTS In the homogeneous coating of a titanium dioxide piment with an organic polymer in which an aqueous solution of a polymer containing carboxyl groups is added to a dispersion of titanium dioxide in water, the polymer is applied to the pigment, the coated pigment is separated off from the aqueous medium, washed, dried and, optionally ground, the improvement which comprises employing as the polymer a polymer of the formula Image in which R1 each independently is hydrogen or methyl, R2 is hydrogen, or alkyl or cycloalkyl containing from 1 to 8 carbon atoms, M is sodium or potassium, R3 is hydrogen, alkyl or cycloalkyl containing from 1 to 12 carbon atoms, or hydroxyalkyl containing from 2 to 6 carbon atoms, m = 0.2 to 1.5, and n = 0 to 0.5, the polymer being added to the titanium dioxide dispersion in the form of a weakly alkaline aqueous solution in about 0.05 to 2.5% by weight based on the titanium dioxide. Le A 19 078

335774

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