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PROCESS FOR THE PREPARATION OF MIXED MINERAL FLOCKS BASED ON TIO2, COMPOSITION BASED ON TIO2 AND SIO2 AND ITS USE AS AN OPACIFYING AGENT IN PARTICULAR IN THE PAPER INDUSTRY
PROCESS FOR THE PREPARATION OF MIXED MINERAL FLOCKS BASED ON TIO2, COMPOSITION BASED ON TIO2 AND SIO2 AND ITS USE AS AN OPACIFYING AGENT IN PARTICULAR IN THE PAPER INDUSTRY
The invention concerns a method for preparing a composition based on TiO2 useful as opacifier which consists in mixing with an aqueous TiO2 dispersion an aqueous dispersion of at least an inorganic spacer, in conditions such that the two mineral species combine into mixed mineral flocs wherein the TiO2 particles are globally spaced from one another by the spacer particles and/or aggregates. The invention also concerns a composition based on TiO2 and SiO2 characterised in that the TiO2 and SiO2 particles are combined therein in the form of mixed mineral flocs based on TiO2 and SiO2 wherein the TiO2 particles are globally isolated from one another by said silica aggregates and its use as opacifier, in particular in the paper industry.
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