Silicone-based antifoam compositions

摘要

A silicone-based antifoam composition, in the form of an emulsion, is disclosed herein which is prepared from the reaction of (A) a primary silicone composition and (B) a polydiorganosiloxane having condensable terminal groups in a nonpolar organic medium selected from the group consisting of polyisobutylene or mineral oil. The reaction of the primary silicone composition (A) and the polydiorganosiloxane (B) produces a secondary silicone composition, which forms the discontinuous phase of the emulsion and the nonpolar organic medium forms the continuous phase of the emulsion. The product composition of this invention exhibits antifoam efficacy greater than that of the primary silicone composition alone.