Dow Corning Corporation

Doris Jean Brecht

Lenin J Petroff

Ronald Paul Gee

Kenneth Christopher Fey

James B McGee

Russell Allen Elms

William J Ollinger, Deceased

By John Ollinger, Legal Representative

A silicone-based antifoam composition, in the form of an emulsion, 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 and 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 resulting composition of the invention exhibits antifoam efficacy greater than that of the primary silicone composition.

Silicone-based antifoam compositions cross-reference to related

There is disclosed a foam control composition comprising (I) a silicone defoamer reaction product and (II) a silicone glycol copolymer, which composition is particularly effective in defoaming highly acidic or highly basic aqueous systems. The compositions of the present invention can further comprise (III) a finely divided filler, and/or (IV) a trimethylsilyl or hydroxyl endblocked polyorganosiloxane.

Silicone foam control compositions

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Sumner, MI, United States of America

Doris Jean Brecht