Dow Corning Toray Company, Ltd.

Dow Corning Corporation

Jianren Zeng

Alain Hilberer

Sung-Hsuen H Chao

Haruhiko Furukawa

Tatsuo Souda

Serge Creutz

Jacqueline L'Hostis

Corina Pagnoni

Pascal Delbrassinne

Masakado Kennoki

Fabian Rouffiange

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

This invention relates to a foam control composition comprising: (A) a silicone antifoam comprising (i) an organopolysiloxane having at least one silicon-bonded substituent of the formula X&#x2014;Ar, wherein X represents a divalent aliphatic group bonded to silicon through a carbon atom and Ar represents an aromatic group, (ii) an organosilicon resin having the formula RSiOwhere Rrepresents a hydrocarbon, a hydrocarbonoxy or a hydroxyl group and a has an average value of 0.5 to 2.4, and (iii) a hydrophobic filler; and (B) an organopolysiloxane resin having at least one polyoxyalkylene group in which the organopolysiloxane resin comprises tetrafunctional siloxane units having the formula SiOand monofunctional siloxane units having the formula RSiO, wherein the total number of tetrafunctional siloxane units in the resin is at least 50% based on the total number of siloxane units, and Rrepresents a hydrocarbon group. The foam control composition may be added to a potentially foaming liquid, particularly a detergent, such as an HDL detergent.

Foam control composition

Silicone antifoaming agent of the present invention demonstrates excellent antifoaming effect with regard to aqueous foaming systems, and is especially suitable for use in conjunction with inks where it significantly suppresses development of cissing during use of ink. The silicone antifoaming agent is characterized by comprising a polyoxyalkylene-modified silicone that has polyoxyalkylene groups expressed by general formula (1) and (2) given below and contains 10 to 200 diorganosiloxane units in one molecule, said polyoxyalkylene-modified silicone satisfying the following conditions: 3&#x2266;E&#x2266;90 and 0.01&#x2266;E/(E+P)&#x2266;0.45, wherein P is the total number of oxypropylene units (&#x2014;CHO&#x2014;) and E is the total number of oxyethylene units (&#x2014;CHO&#x2014;) contained in one molecule.

Silicone antifoaming agent

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Chiba, Japan

Jianren Zeng