| 摘要 |
PCT No. PCT/EP96/00308 Sec. 371 Date Jul. 24, 1997 Sec. 102(e) Date Jul. 24, 1997 PCT Filed Jan. 26, 1996 PCT Pub. No. WO96/22942 PCT Pub. Date Aug. 1, 1996The invention relates to a process for the production of modified SiO2 aerogels in which a) a silicatic lyogel is prepared, b) if desired, the lyogel prepared in step a) is subjected to a solvent exchange with another organic solvent, c) the gel obtained in step a) or b) is reacted with at least one chlorine-free silylating agent, and d) the gel obtained in step c) is dried subcritically, wherein the chlorine-free silylating agent is a compound of the formula I <IMAGE> (I) wherein each R1 is identical or different and is selected from a group consisting of linear C1-C6-alkyl radicals, branched C1-C6-alkyl radicals, cyclohexyl radicals and phenyl radicals, R2, R3 and R4 are identical or different and are selected from the group consisting of hydrogen atoms, linear C1-C6-alkyl radicals, branched C1-C6-alkyl radicals, cyclohexyl radicals and phenyl radicals; and n=1, 2 or 3. |
