Wacker Chemie Ag

Wacker-chemie Gmbh

Josef Wimmer

Willibald Burger

Elisabeth Hoelzlwimmer

Christoph Deckert

Markus Grandl

Corinna Sage

Christian Herzig

Holger Rautschek

Martina Joachimbauer

Christine Wolf

Erika Zscheile

Elisabeth HÖLZLWIMMER

Defoamer compositions which act rapidly and over an extended period of time employ organopolysiloxanes having alkylene linking groups bridging siloxy groups, a filler, a silicone resin, and phosphoric acid.

Defoaming formulations containing organopolysiloxanes

Rapid and long lasting defoaming is accomplished by use of a defoamer formulation employing an organopolysiloxane having siloxy groups linked by an alkylene group, a filler, a silicone resin, a silanol-terminated organopolysiloxane, and an inorganic or organic acid.

Defoamer formulations with rapid knockdown and extended performance contain specific polyorganosiloxanes having alkylene linkages between siloxy groups, silicone resins, fillers, a polyoxyethylene surfactant, and an organic or inorganic acid.

Effective and long lasting defoamer compositions are prepared by admixing an organopolysiloxanes, a hydrophilic silica, a hydrophobic silica, optionally an organopolysiloxanes resin, and optionally a water insoluble inorganic compound, at a temperature of 50&#xb0; C. to 250&#xb0; C. until the viscosity of the composition has decreased to at least half its original viscosity prior to heating.

Method for producing antifoam compositions

(A) Siloxane-based antifoams and (B) silicone polyethers prepared by reacting organopolysiloxanes (1) containing 0.05% to 1.6% by weight of Si-bonded hydrogen atoms

Defoamer formulations

Defoamer compositions of high effectiveness containing at least one siloxane-based antifoam and polysiloxane copolymers obtained by coupling a polysiloxane bearing active-hydrogen-containing hydrophilic polymer moieties by means of a di- or polyisocyanate.

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Burghausen, Germany

Josef Wimmer