POLYORGANOSILOXANE EMULSIONS WITH LARGE PARTICLE SIZE AND PROCESS FOR THEIR PREPARATION

Abstract

A process for preparing storage-stable, aqueous polyorganosiloxane emulsions includes preparing an emulsifier-water mixture that includes at least one alkyl polyglycoside (B) and water (C) and optionally further emulsifiers (D), optionally thickeners (E) and optionally further additives (F). The process also includes preparing a preliminary emulsion by addition of at least one polyorganosiloxane (A) to the emulsifier-water mixture. The preliminary emulsion is prepared under the action of low shear forces using stirring devices with a maximum peripheral speeds of 4.5 m/s. The process yields polyorganosiloxane emulsions having a particle size D(50) of 1 μm to 50 μm, based on the D(50) value of the volume distribution measured in accordance with the principle of Fraunhofer diffraction (according to ISO 13320).

CPC Classifications