Process for the manufacture of dispersible alumino-silicates

A process for the production of an aqueous/aqueous-acidic dispersion of an alumino-silicate comprising:

• hydrolyzing jointly or separately from each other in space or time at least one hydrolyzable aluminum compound and at least one hydrolyzable organosilicon compound, at a temperature of from 50 to 98° C., wherein the alumninum compound/silicon compound ratio is from 99.5 wt. %:0.5 wt. % to 50 wt. %:50 wt. %, each referring to Al2O3:SiO2:;
• during or after the hydrolysis subjecting the hydrolysis reaction products to hydrothermal aging in an aqueous/aqueous-acidic media at a temperature of from 80 to 220° C. for a period of time greater than 0.5 hour;
• recovering a dry powder of the aged alumino-silicate;
• and
• dispersing the alumino-silicate powder in an aqueous/aqueous-acidic media is an amount of greater than 90% wt. without the addition of or treatment with any organic solvent.