| abstract |
The invention relates to a process for the preparation of modified SiO₂ gels, called "xerogels", and to the xerogels thus produced themselves and their use.n n n The xerogels are prepared by acidifying an aqueous water glass solution, polymerizing the resulting silica by adding a base to an SiO₂ gel, largely washing the water out of the gel with an organic solvent, reacting it with a silylating agent and then at -30 up to 200 ° C and 0.001 to 20 bar. |