Dow Corning Corporation

Dow Corning Toray Company, Ltd.

Dow Silicones Corporation

Dow Toray Co., Ltd.

Alain Hilberer

Serge Creutz

Jianren Zeng

Sung-Hsuen H Chao

Haruhiko Furukawa

Tatsuo Souda

Pascal Delbrassinne

Masakado Kennoki

Corina Pagnoni

Fabian Rouffiange

Emilie Navet

Laurent Vermeire

Sung-Hsuen Chao

An anti-foaming agent containing (A) an organopolysiloxane and a finely powdered inorganic filler, (B) a polyoxyalkylene group-containing branched chain organopolysiloxane, and (C) an anionic surfactant. This anti-foaming agent exhibits stable anti-foaming performance even at high temperatures that reach, for example, 80QC or under strongly alkaline conditions and produces no aggregates.

Anti-foaming agent and pulp production method

In a process for separating a solid material from a suspension of the solid material in water, an organopolysiloxane polyalkylene oxide copolymer comprising a branched organopolysiloxane structure is added to the suspension of solid material in water and the suspension is drained. The organopolysiloxane polyalkylene oxide copolymer comprising a branched organopolysiloxane structure increases the rate of drainage of the suspension.

Drainage of an aqueous composition

A process for making a foam control composition comprising a cross-linked polyorganosiloxane in which is dispersed a filler, with hydrophobic surface, comprising step (A) mixing (i) a finely divided filler, (ii) a polyorganosiloxane having on at least two reactive substituents, for example on average two reactive substituents, and (iii) a polyorganosiloxane having at least three reactive substituents, capable of addition reaction via hydrosilylation; (B) hydrosilylation reaction of components (ii) and (iii) until the mixture at least partially gels, followed by applying shearing forces to this at least partially gelled mixture. Optionally step (A) comprises a diluent or solvent and after step (B) an emulsification step is carried out to make the foam control composition into an O/W emulsion. Also a process for controlling foam in an aqueous environment by using a foam control composition according to the invention, selected from inks, coatings, paints, detergents, black liquor of from those encountered during pulp and paper manufacture, waste water treatment, textile dyeing processes or the scrubbing of natural gas.

Process for making and using foam control compositions

A foam control composition comprises a polydiorganosiloxane fluid comprising units of the formula where each group R, which may be the same or different, is selected from an alkyl group having 1 to 36 carbon atoms or an aryl group or aralkyl group having up to 36 carbon atoms, the mean number of carbon atoms in the groups R being at least 1.3, and an additive composition of melting point 35 to 100&#xb0; C. comprising a substantially non-polar organic material, preferably a polyol substantially fully esterified by carboxylate groups each having 7 to 36 carbon atoms.

Silicone foam control compositions

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Recquignies, France

Alain Hilberer