Titanium dioxide pigments, method for production thereof and...

Details Titanium dioxide pigments, method for production thereof and... Titanium dioxide pigments, method for production thereof and...

C - Chemistry, Metallurgy

09

C

C09C 1/36 (2006.01) C08K 9/06 (2006.01) C09C 3/06 (2006.01) C09C 3/12 (2006.01)

Patent

CA 2384642

The titanium dioxide pigment of the present invention comprises titanium dioxide particles, the coating layer containing the aluminum phosphate compound and the coating layer containing the hydrolyzate of the organosilane compound, on the surface of the particles, in which a difference in water content between 100°C and 300°C, determined by the Karl Fischer method, is not greater than 1500 ppm, and is thus excellent in light fastness, hydrophobicity and dispersibility. In particular, the titanium dioxide pigment of the invention is extremely advantageous as a colorant for plastics, which requires light fastness (resistance to discoloration) lacing resistance and dispersibility, to a high degree.

Cette invention a trait à un pigment au dioxyde de titane, comportant des particules de dioxyde de titane enrobées d'une couche à base d'un composé de phosphate d'aluminium ainsi que d'une couche à base d'un hydrolysat d'un composé organique de silane, la différence entre la teneur hygrométrique mesurée selon la méthode de Karl Fisher à 100 DEG C et à 300 DEG C étant égale ou inférieure à 1 500 ppm. La résistance à la lumière de ce pigment est remarquable ainsi que son hydrophobie et sa dispersabilité. Il se révèle très avantageux lorsqu'il est utilisé comme colorant pour plastiques, lesquels exigent une forte résistance à la lumière (résistance à la décoloration) ainsi qu'une très bonne dispersabilité.

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