| abstract |
Aqueous dispersion containing: - at least one metal oxide selected from the group consisting of alpha-aluminium oxide, cerium oxide, silicon dioxide, titanium dioxide and zirconium dioxide and in addition at least one transition aluminium oxide which is present in the form of aggregates of primary particles, wherein - the total content of metal oxide and transition aluminium oxide is from 60 to 75% by weight, based on the total amount of the dispersion, - the content of transition aluminium oxide is from 30 to 45% by weight, based on the total amount of the dispersion, - the BET surface area of the transition aluminium oxide is from 30 to 90 m /g, - the mean aggregate diameter of the transition aluminium oxide is less than 100 nm, - the mean particle diameter of the metal oxide is from 100 to 500 nm, and - a dispersant selected from the group consisting of polyaluminium hydroxychloride, polyaluminium hydroxynitrate and/or polyaluminium hydroxysulphate. |