| abstract |
Spherical polysilsesquioxane particles are prepared by reacting trialkoxysilanes of formula, (I)n nRSi(OR 1 ) 3 (I),n where R represents a C 1-16 hydrocarbon radical whose carbon chain may be interrupted by nonadjacent —O— groups, R 1 represents a C 1-4 alkyl radical, with acidified water having a pH≤6 with stirring to produce a hydrolysate, in a second step mixing the hydrolysate with a solution of NaOH and/or KOH, and in a third step storing the mixture is stored for at least 8 h before isolating polysilsesquioxane particles thus formed. |