Process for manufacture of aqueous emulsions of silicone oils and resins.

摘要

This invention relates to a process for manufacturing a more stable and less shear sensitive aqueous emulsion of high molecular weight silicone oils and resins. Direct emulsification of high molecular weight silicone oil or resin is avoided by using a select group of reactive low molecular weight silicones, which may also contain silanes, and which reactants are polymerized in the emulsion with an appropriate surface active catalyst in a separate storage vessel, after rapid formation of a grease and dilution to the emulsion have been completed and after the emulsion has been transferred to the storage vessel. The rapid formation of the grease precursor and dilution to an emulsion and the removal of the resulting emulsion to a separate vessel for condensation polymerization allows this process to be practiced as a batch, continuous or semicontinuous process. The use of a condensation polymerization process also results in the elimination of unwanted cyclic by-products in the polymer of the oil or resin emulsion.