Wacker Chemie Ag

Markus Grandl

Elisabeth Hoelzlwimmer

Josef Wimmer

Christoph Deckert

Corinna Sage

Ernst Selbertinger

Gerhard Beer

Werner Limmer

Elisabeth HÖLZLWIMMER

An aqueous of pre-crosslinked organopolysiloxanes and process for producing the same. The aqueous dispersion is preferably aqueous emulsion, including pre-crosslinked organopolysiloxanes which contains on average at least one structural unit of the general formula SiRO—Y—SiROand units of the formula RSiO. Where Y is a radical of the formula—R—[NR—R—]—NR—OC—[C(Z)(H)]—[C(Z)(H)]—CO—NR—[R—NR]—Rand where R, R, R, R, k1, k2, x, Zand Zhave a definition a set forth within herein. Additionally, the sum of k1+k2 is ≥1, the that at least one radical Zor Zis a hydroxyl or NHRgroup, preferably a hydroxyl group, and so the bridging group Y contains at least one hydroxyl or NHRgroup, preferably at least one hydroxyl group.

Aqueous dispersions of pre-crosslinked organopolysiloxanes

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.

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Burghausen, Germany

Markus Grandl