Method for treating the surface of a titanium dioxide pigment

C - Chemistry – Metallurgy – 09 – C

Patent

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C09C 1/36 (2006.01) D21H 17/69 (2006.01)

Patent

CA 2532552

The invention relates to a method for treating the surface of a titanium dioxide, said method enabling the production of pigments with an enhanced retention and opacity, wherein a constantly high opacity can be achieved with less pigment. The method is characterized in that an aluminum constituent and a phosphorous constituent are initially added to a TiO2 suspension, during which the pH value thereof does not fall below 10. The pH value of the suspension is then lowered to 9 by adding an acid component. The pigment produced according to the invention is excellently suitable for use as decorating paper.

Procédé de traitement de surface d'un dioxyde de titane permettant d'obtenir des pigments à rétention et à opacité améliorées, une opacité élevée inchangée pouvant être obtenue avec moins de pigment. Ledit procédé consiste d'abord à introduire un constituant phosphore et un constituant aluminium dans une suspension de TiO¿2?, la valeur pH de cette suspension ne s'abaissant pas au-dessous de 10 lors de cette opération. Ensuite, la valeur pH de la suspension est abaissée à une valeur inférieure à 9 par ajout d'un constituant acide. Le pigment fabriqué selon ledit procédé est parfaitement adapté pour être utilisé dans du papier de décoration.

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