Method for the surface treatment of a titanium dioxide pigment

Details Method for the surface treatment of a titanium dioxide pigment Method for the surface treatment of a titanium dioxide pigment

2006-12-12

2006-12-12

Green, Anthony J. (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C106S444000, C428S403000

Reexamination Certificate

active

07147702

ABSTRACT:
The invention relates to a method for the surface treatment of a titanium dioxide that leads to pigments with improved retention and improved opacity, where consistently high opacity can be obtained using less pigment. The method is characterised in that an aluminium component and a phosphorus component are first added to a TiO2suspension, during which process its pH value does not drop below 10. The pH value of the suspension is subsequently lowered to below 9 by adding an acid component. The pigment produced by the method according to the invention is eminently suited to use in decorative laminating paper.

REFERENCES:
patent: 5165995 (1992-11-01), Losoi
patent: 5665466 (1997-09-01), Guez et al.
patent: 6342099 (2002-01-01), Hiew et al.

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