Wacker Chemie Ag

Marko Prasse

Uwe Scheim

Detlev Ostendorf

Frank Sandmeyer

Georg Loessel

Lars Zander

Volker Stanjek

Holger Rautschek

Peter Schoeley

Michael A Brook

Daniel Schildbach

Yang Chen

Herbert Soellradl

Steffen Doerrich

Marco Kauschke

Stephan Marrack

Peter Schöley

Georg Lössel

Steffen DÖRRICH

Herbert Söllradl

Curable organopolysiloxane compositions contain (D) fillers and (K) amines, wherein the radicals and indices have the definition specified in claimWhen coarse and fine grained fillers are employed, the composition can be used to mold artificial stone.

Curable organopolysiloxane compositions

Branched organopolysiloxanes are prepared from alkoxysilanes and polydiorganosiloxanes over two stages by basic equilibration and subsequent acid-catalyzed reaction with water to the desired degree of condensation, wherein the entire process does not require the use of additional organic solvent, no wastewater is generated and the process is particularly suitable for the controlled production of so-called DT resins.

Process for preparing branched organopolysiloxanes

Addition curable composition containing specific silicone resins containing aliphatically unsaturated groups and an organic compound containing unsaturated groups such as acrylate or methacrylate groups are suitable when used with fine and coarse fillers to produce artificial stone with both high hardness and high flexural strength.

Synthesis of organyloxyfunctional organosilicon compounds is facilitated by a two-step process using a basic lithium, guanidine or amidine catalyst in the first step, and a phosphorus compound having a P&#x2550;O linkage in a second step.

Process for preparing organosilicon compounds containing organyloxy groups

Aqueous dispersions which are storage stable and cure to tack-free elastomers upon removal of water contain water, alkoxysilyl-terminated polyethers and alkoxy-functional siloxanes, optionally catalysts, fillers, and other additives customary in dispersions of organosilicon compounds.

Aqueous dispersions of organosilicon compounds

Artificial stone having excellent mechanical and weatherability properties is prepared from a highly filled crosslinkable organosilicon composition where the filler comprises at least 20 weight percent of coarse fillers, the organosilicon component contains silicon-bonded alkoxy and or hydroxyl groups, with a catalyst containing a metal compound and an amidine or guanidine.

Multistep continuous and semicontinuous hydrolysis and condensation of chlorosilanes with alcohol containing minimal water in a column in a first step to form a silicone resin intermediate, followed by further condensation provides silicone resins in reproducible fashion substantially free of hydrogen chloride, without reactor gelatin.

Process for preparing organopolysiloxanes

Moisture-curing adhesives simultaneously having high tensile strength and elongation are prepared by admixing a silane-terminated polyurethane or polyether polymer having a defined and limited molecular weight, finely divided silica, and an organosilicon compound containing basic nitrogen.

Compositions on the basis of organyloxysilane-terminated polymers

Highly condensed silicon resins are obtained by a three step continuous procedure without the use of organic solvent, by preliminarily forming a partial alkoxylate by reacting a chlorosilane with alcohol containing no or a minimal amount of water, feeding the partial alkoxylate to a reaction column to form a silicone resin of low degree of condensation, and further condensing the silicone resin intermediate thus formed to produce a silicone resin product.

Method for producing organopolysiloxanes

Moisture curable RTV-1 silicone elastomers with hydrophilic surfaces are produced from crosslinkable compositions containing a polyoxyethylene ether glycol terminated with both a Chydrocarbon group and an alkoxysilyl group.

Cross-linkable compositions based on organosilicon compounds

Crosslinkable compositions contain a calcium carbonate-rich filler coated with a carboxylic acid of the formulaR&#x2014;(OCR&#x2014;C(&#x2550;O)OH). The compositions exhibit low modulus, good adhesion to substrates, and low skin formation time.

Cross-linkable compositions

The invention relates to materials which are based on organosilicon compounds, are storable with exclusion of water and are crosslinkable to elastomers on ingress of water at room temperature, which comprise organic acids and basic nitrogen or basic phosphorus, to processes for preparation thereof and to moldings produced therefrom.

Crosslinkable materials based on organosilicon compounds

Moisture-curable organosilicon compositions which are storable in the absence of water, and crosslinkable on admission of water at room temperature to give elastomers, are based on organosilicon compositions containing:

Crosslinkable substances based on organosilicon compounds contain encapsulated biocides which maintain their effectiveness for extended periods.

Crosslinkable substances based on organosilicon compounds

Organosilicon compounds having organyloxy groups are prepared by reacting an organosilicon compound (A) having at least one silanol group with a compound (B) containing at least two organyloxy groups in the presence of a component (C) comprising a zinc chelate (C1) and at least one additive (C2) selected from the group consisting of compounds containing basic nitrogen (C21) and alcohols (C22). The products are useful in compositions which crosslink at room temperature.

Growing community of inventors

Glaubitz, Germany

Marko Prasse