High opacity TiO 2 pigment and production method

Details High opacity TiO 2 pigment and production method High opacity TiO 2 pigment and production method

2007-01-30

2010-11-30

Hailey, Patricia L (Department: 1793)

Compositions: coating or plastic

Materials or ingredients

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

C106S442000, C106S443000, C106S446000, C428S143000, C428S144000, C428S145000, C428S403000

Reexamination Certificate

active

07842131

ABSTRACT:
The invention relates to a rutile titanium dioxide pigment for use in decorative laminating papers that yields higher opacity of the papers compared to the prior art, as well as a method for its manufacture. The pigment displays a surface coating that contains aluminum phosphate, aluminum oxide, silicon oxide and titanium oxide. The silicon oxide is precipitated in fluffy form. The coated particles display a BET value of at least 15 m2/g.The manufacturing method is characterized in that an aluminum and a phosphorus component are first added to a TiO2suspension. Thereafter, an alkaline silicon component, an acid-reacting titanium component and, optionally, a further pH-regulating component are added, the pH value being set in the range from 4 to 9 in this context.

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