Patent ID: 8486188

Claim:
A process for preparing polyhydroxy-functional polysiloxanes comprising branched polyglycidol polyether radicals and having the general formula where Z=C 1 -C 14 alkylene, RK=unbranched polyether radical composed of alkylene oxide units having 1-6 carbon atoms, and/or aliphatic and/or cycloaliphatic and/or aromatic polyester radical having a weight-average molecular weight of between 200 and 4000 g/mol, R=polyhydroxy-functional branched polyglycidol polyether radical, which consists of a branched polyglycidol group or contains a branched polyglycidol group, R 2 and R 3 independently of one another are C 1 -C 14 alkyl aryl or aralkyl, —O(C 1 -C 14 alkyl, aryl or aralkyl), —OCO(C 1 -C 14 alkyl, aryl or aralkyl), —O—CO—O(C 1 -C 14 alkyl, aryl or aralkyl), —OSO 2 (C 1 -C 14 alkyl, aryl or aralkyl), —H, —Cl, —F, —OH, —R, or —RK, R 4 =C 1 -C 14 alkyl, aryl or aralkyl, A=1-20, B=2-300, and C=0-20; and if C=0 then R 3 ═R and/or R 2 ═R, wherein at least one allylic or methallylic starter compound is reacted with at least one glycidol or glycidol carbonate such that an allyl polyether or methallyl polyether modified with one or more branched polyglycidol radicals is formed, and then the allyl polyether or polyethers or methallyl polyether or polyethers thus prepared is or are subjected to addition reaction with an Si—H-functional alkyl polysiloxane in the presence of an acid-buffering agent.