Patent ID: 8911638

Claim:
A process for the preparation of a pourable silicon dioxide dispersion, comprising: supplying water, at least one polyol and optionally an additive from a reservoir and circulating the mixture of the water and polyol via a rotor/stator machine; while the rotor/stator is running, continuously or discontinuously introducing via a filling device a silicon dioxide powder to the mixture of the water and polyol; closing said filling device and continuing the dispensing until the current uptake of the rotor/stator machine is largely constant; and then adding an amount of a substance having an alkaline action so that a dispersion pH of 10<pH≦12 results, said substance having an alkaline action being added such that no gel formation takes place; to obtain said silicon dioxide dispersion which is stable and pourable; wherein an average, number-related aggregate diameter of silicon dioxide particles in dispersion is less than 200 nm, said pourable silicon dioxide dispersion comprising: at least 35 wt. % of said silicon dioxide powder, based on the total amount of the dispersion, 10 to 35 wt. % of said at least one polyol, based on the total amount of the dispersion, 20-55 wt. % of water, based on the total amount of the dispersion, 0 to 10 wt. % of an additive, based on the total amount of the dispersion, and said substance having an alkaline action in an amount so that a pH of 10<pH≦12 is established; and wherein said silicon oxide dispersion is pourable at room temperature.