| abstract |
Process for the preparation of polyether siloxanes whose polyether residues are bonded to the polysiloxane skeleton by Si-C bonds, polysiloxanes having the general average formula in which at least one radical R² is a radical of the general formula is with a compound having at least one epoxy group in amounts such that at least two epoxy groups are present in one OH group, in the presence of Lewis acids at temperatures of ≦ 60 ° C. or in the presence of complex catalysts which accelerate the attachment of epoxy groups to hydroxyl groups, reacted at temperatures up to 140 ° C and the reaction is carried out, if appropriate, in the presence of an inert solvent.n n n The polyether siloxanes obtained have defined functionality and are free from excess, unreacted polyol components. |