Wacker Chemie Ag

Wacker-chemie Gmbh

Wolfgang Ziche

Uwe Scheim

Volker Stanjek

Ernst Selbertinger

Susanne Straussberger

Richard Weidner

Holger Rautschek

Frank Achenbach

Wolfgang Hechtl

Willibald Burger

Wolfram Schindler

Oliver Schaefer

Norman Dorsch

Christof Brehm

Andreas Koellnberger

Anton Heller

Gabriele Dineiger

Andreas Köllnberger

Klaus Obermeier

Markus Winterer

Defoamer compositions containing a plurality of defined organopolysiloxanes exhibit very short initial foam collapse and yet exhibit long lasting defoaming activity when added to aqueous media prone to foaming.

Defoaming formulations containing organopolysiloxanes

Curable silicone rubber compositions of high viscosity can be ballistically printed if the melt flow index is within a defined shear thinning range and the viscosity is also within a defined range.

Highly viscous silicone compositions for producing elastomeric molded parts by means of ballistic generative methods

Textile fabrics are rendered water repellent yet breathable by impregnating with an organopolysiloxanes of the formulaRSiO[SiR(OR)O][SiRO][SiRRO]SiR&#x2003;&#x2003;(I).

Method for impregnating textiles with compositions containing alkoxypolysiloxane

Cyclopentadienyl platinum complexes bearing ethylenic unsaturation are efficient photocatalysts for hydrosilylation of compounds containing aliphatic carbon-carbon multiple bonds, while exhibiting extended dark time, and are particularly useful in addition-curable organopolysiloxane compositions.

Platinum complexes and their use in compounds that can be cross-linked by a hydrosilylation reaction

Moisture curable one-component organosilicon compositions exhibiting excellent resilience and adhesiveness contain an &#x3b1;-alkoxysilyl-terminated base polymer, aminoalkylalkoxysilane adhesion promoter, and polyolefin bearing succinic anhydride groups.

Cross-linkable organosilicon-based compositions

Silicone foams having good foam structure and rapid cure are produced from foamable mixtures containing a physical blowing agent and an organically modified organopolysiloxane containing at least one urea or urethane group and an alkoxy(alkyl)siloxy unit.

Silicon-containing foams

In the preparation of aminoorganylsilanes and cyclic aminosilanes by reaction of an organyl amine with a haloorganylsilane, the byproduct halide salt of the amine reactant is decomposed to amine by addition of a base whose halide salt forms a liquid phase at a temperature below 200&#xb0; C., and the liquid base halide is separated from the reaction mixture.

Method for producing amino-organosilanes

Undesired polymerization of (meth)acrylatoalkoxysilanes during their industrial preparation and handling is accomplished by avoiding contact with surfaces containing more than 1% by weight of iron.

Method for preventing polymerization of unsaturated organosilicon compounds

Siloxane copolymers are prepared stepwise by reacting an aminoalkyldiorganoalkoxysilane with a di- or polyisocyanate to form an alkoxysilyl-terminated urea compound, and the urea compound or its reaction product with water is subsequently reacted with a di- or polysilanol-functional polymer to form a copolymer.

Method for producing siloxane copolymers

Crosslinkable polymers containing organopolysiloxane, polyurea, and/or polyurethane moieties further contain at least one photopolymerizable ethylenically unsaturated group and a photoinitiator which allows crosslinking upon exposure to radiation.

Crosslinkable siloxane urea copolymers

Organopolysiloxaneurea polymers with good melt viscosity but which effectively crosslink in the presence of moisture contain alkylalkoxysilane or alkylaminoalkylalkoxysilane groups pendant to the polymer chain. The polymers are useful as non-creeping hot melt adhesives, and for other uses as well.

Cross-linkable siloxane urea copolymers

The invention relates to moisture-crosslinkable organopolysiloxane-polyurea block copolymers, to a process for preparing the crosslinkable organopolysiloxane-polyurea block copolymers, and to their use; to crosslinkable compositions comprising the crosslinkable organopolysiloxane-polyurea block copolymers, to the preparation of the crosslinkable compositions, to their vulcanization, and to the use of the vulcanizates.

Crosslinkable siloxane-urea copolymers

Aqueous dispersions containing organopolysiloxane/polyurea copolymers prepared by reacting aminoalkyl-functional organopolysiloxanes with a diisocyanate in water in the presence of a protonating acid, and optionally one or more surfactants and/or protective colloids. The organopolysiloxane/polyurea polymers may be prepared without the presence of ionic groups if desired.

Dispersions containing organopolysiloxane/polyurea copolymers

The present invention relates to a process for preparing organyloxysilyl-terminated polymers which have increased stability toward atmospheric moisture, by reacting hydroxy-terminated organic polymers with isocyanato-functional silanes in the presence of at least one catalyst selected from the group consisting of bismuth and zinc compounds, and to crosslinkable compositions comprising such polymers.

Preparation of organyloxysilyl-terminated polymers

Organopolysiloxane compositions obtainable by reaction of (a) essentially linear organopolysiloxanes which are terminated at both ends by Si-bonded hydroxy groups, (b) optionally, plasticizers, (c) at least one dialkylaminomethylalkyldialkoxysilane chain extender and/or partial hydrolysate thereof, (d) at least one deactivator, (e) optionally, one or more alkyltrialkoxysilanes and/or partial hydrolysates thereof, and (f) optionally, catalysts for accelerating the reaction of silane (e) with Si&#x2014;OH groups, are useful in low-modulus compositions which can be crosslinked at room temperature, in particular, compositions which crosslink with elimination of alcohols.

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Burghausen, Germany

Wolfgang Ziche