Dispersion containing titanium dioxide

A process for the preparation of an aqueous dispersion, said process comprising:

• placing
• an aggregated titanium dioxide powder, corresponding to a desired amount in the dispersion,
• at least one amino alcohol and
• at least one carboxylic acid are placed in water,
• producing a pre-dispersion by introduction of energy in an amount of less than 1000 kJ/m3,
• dividing the pre-dispersion into at least two partial streams,
• placing said partial streams under a pressure of at least 500 bar in a high-energy mill,
• venting said partials streams via a nozzle,
• allowing said partial streams to come together in a gas-or liquid-filled reaction space, and
• optionally adding a preservative;
• wherein said aggregated titanium dioxide powder has a specific surface area of from 20 to 150 m2/g and is added in such an amount that the desired dispersion comprises at least 20 wt. % titanium dioxide,
• wherein said at least one amino alcohol has from 1 to 6 carbon atoms,
• wherein said at least one carboxylic acid is selected from the group consisting of a dibasic carboxylic acid having from 2 to 6 carbon atoms, a hydroxycarboxylic acid having from 2 to 6 carbon atoms, and mixtures thereof,
• wherein, in said dispersion, the aggregated titanium dioxide powder has a mean, volume-related aggregate diameter of less than 150 nm,
• wherein said dispersion comprises the amino alcohol in an amount of from 2.5 to 7.0 μmol/m2 of specific surface area TiO2, and
• wherein said dispersion comprises the carboxylic acid in an amount of from 1.0 to 3.5 μmol/m2 of specific surface area TiO2.