TITANIUM DIOXIDE BASED PIGMENT (VERSIONS), METHOD FOR PRODUCTION THEREOF, METHODS OF MAKING DECORATIVE PAPER AND COATING MATERIALS, DECORATIVE PAPER, DECORATIVE COATING MATERIAL AND LIMINATE Russian patent published in 2013 - IPC C09C1/36 C09C3/06 D21H17/69 D21H19/38 C01G23/47 

FIELD: chemistry.

SUBSTANCE: titanium dioxide based pigment contains titanium dioxide particles in rutile form, having a coating. The coating contains aluminium phosphate, aluminium oxide, titanium oxide and silicon oxide. The particles are characterised by specific surface area, calculated according to a Brunauer-Emmet-Teller (BET) equation, of at least 15 m²/g. To obtain coated pigments, an aqueous suspension of uncoated titanium dioxide particles is prepared first, followed by addition of aluminium-containing and phosphorus-containing components. Further, while maintaining pH 4-9, an alkaline silicon-containing component and at least one pH regulating component, one of which is an acidic titanium-containing component, are then added. The formed suspension is then filtered, washed and dried and the precipitate is ground to obtain coated particles.

EFFECT: invention increases opacity of decorative paper.

22 cl, 5 ex, 1 tbl