Patent ID: 7834122

Claim:
A process for preparing a polysiloxane of the general formula [M′ D n ] 3 T (I), where M′=QSiY 2 O 1/2 D=SiY 2 O 2/2 T=SiZO 3/2 Q=identical or different organic radicals bearing ammonium functions, Y=identical or different radicals from the group consisting of alkyl, aryl or alkaryl having 1 to 30 carbon atoms, preferably methyl or phenyl, in particular methyl, Z=identical or different radicals from the group consisting of alkyl, aryl or alkaryl having 1 to 30 carbon atoms, preferably methyl or phenyl, in particular phenyl, n=5 to 250, which comprises applying conventional conditions to equilibrate phenyltris(dimethylsiloxy)silane with cyclic siloxanes in a first stage and subsequently to hydrosilylate these in a second stage with epoxides comprising double bonds and to react the epoxysilanes thus obtained with tertiary amines in a third stage to give the corresponding ammonio-bearing siloxanes.