Patent ID: 7514518

Claim:
A process for preparing a defined organopolysiloxane product, comprising reacting halosilane with alcohol and water in the presence of the defined organopolysiloxane in a first reaction unit comprising a distillation column, optionally a reflux condenser, and a vessel already containing previously prepared defined organopolysiloxane which has at least the same number of siloxane units and alkoxy group as the defined organopolysiloxane product, said previously prepared organopolysiloxane being present in said vessel prior to said reacting of halosilane with alcohol and water, heating the contents of the vessel to boiling under reflux and introducing halosilane to be reacted into the column above the lower column end, removing hydrogen halide formed from the distillation column, and removing organopolysiloxane from the vessel continuously to a degree in which it is formed, wherein halosilane, alcohol and water are added continuously to the first reaction unit in such amounts that more water is always present in the reaction unit than is consumed by the added Si-halogen units of the halosilanes.