Wacker Chemie Ag

Michael Stepp

Uwe Paetzold

Daniel Schildbach

Laszlo Fabry

Karl-Heinz Felix

Dominik Auer

Volker Stanjek

Frank Achenbach

Detlev Ostendorf

Andreas Koellnberger

Markus Merget

Arvid Kuhn

Barbara Mueller

Michael Mueller

Albert Hausberger

Uwe Pätzold

Birgit Peschanel

Holger Wadewitz

Christian Schierlinger

HyungDae Jin

Rabih Makki

Ufuk Karabiyik

Leonie Deichner

Inge Schreiber

Herbert Koller

Martin Sebald

Barbara Muller

Barbara MÜLLER

Hydrosilylative crosslinking compositions containing an aliphatically unsaturated compound which is the reaction product of an alkali metal siliconate and a chlorosilane and a coupler having two silicon bond hydrogen atoms have high compression and damping characteristics when cured.

Crosslinkable organopolysiloxane compositions

An organo(poly)siloxane (A) consists of units of general formula (I) RSiO, where R is selected from the radicals R, —OR, R, Rand Q, wherein Rdenotes a monovalent substituted or unsubstituted hydrocarbon radical having 1 to 18 carbon atoms, Rdenotes a hydrogen atom or a monovalent substituted or unsubstituted hydrocarbon radical having 1 to 6 carbon atoms, Rdenotes a monovalent aliphatic unsaturated hydrocarbon radical having 2 to 18 carbon atoms, Rdenotes a monovalent thiol-functionalized hydrocarbon radical, Q is a nitrogen functional group of formula (II) —CRR—NRR, where Rand Reach independently denote hydrogen or a substituted or unsubstituted hydrocarbon radical, and Rand Reach independently denote hydrogen or the methyl radical. The organo(poly)siloxane (A) contains per molecule at least one unit of general formula (III) Q-Si(OR)O, at least 1 aliphatically unsaturated radical R, and at least 2 thiol-functionalized groups R.

Polysiloxanes with radiation- and moisture-cross-linkable groups

Urea-functional organopolysiloxanes containing units of the formulaRSiO&#x2003;&#x2003;(I),where R is a radical Ror a radical &#x2014;ORor a radical Q, Q is a urea-functional radical of the formula&#x2014;R&#x2014;[NR&#x2014;R&#x2014;]NRR&#x2003;&#x2003;(II),where the radicals Rare identical or different and are each a radical R' or a radical R, where R&#x2032; is hydrogen or a monovalent C-C-hydrocarbon radical where Ris radical of the formula &#x2014;C(&#x2550;O)&#x2014;NH, and where at least one urea-functional radical Q having a radical Ris present per molecule are prepared by reacting amino-functional organopolysiloxanes comprising units of the formulaR&#x2032;SiO&#x2003;&#x2003;(IV),where A is an amino-functional radical of the formula&#x2014;R&#x2014;[NR&#x2032;&#x2014;R&#x2014;]NR&#x2032;R&#x2003;&#x2003;(V),with the proviso that at least one amino-functional radical A is present per molecule in the organopolysiloxanes made up of units of the formula (III),with ortho-substituted aryl carbamates of the formulaR&#x2014;Ar&#x2014;O&#x2014;C(&#x2550;O)&#x2014;NH&#x2003;&#x2003;(VI),where Ar is an ortho-substituted aryl radical.

Method for preparing urea-functional siloxanes

Linear organopolysiloxanes of the structure M-(T-M)-M are prepared by reaction of lithium and/or sodium silanolates with chlorosilanes. The products contain at least two groups selected from silicon-bonded hydrogen and aliphatically unsaturated groups.

Reactive siloxanes and process for the production thereof

Pulverulent alkali metal alkyl siliconates having lesser hydroscopicity and improved hydrophobicity in construction materials are produced by spray drying an aqueous solution of an alkali metal alkylsiliconate having a defined range of alkali metal content, a low alcohol content, and a low chlorine content.

Method for producing pulverulent solids from alkali salts of silanols

Siloxanes which are liquid at 25&#xb0; C. and 1 bar, have 2% to 12% by weight of silanol groups and are of the formula (1):MDTQM'D&#x2032;T&#x2032;&#x2003;&#x2003;(1),

Process for preparing siloxanols from metal salts of silanols

Cyclic siloxanes are prepared economically by reaction of an alkali metal siliconate having a mol ratio of alkali metal cation to silicon of less than one or their hydrolysis/condensation products or mixture thereof, with a halosilane.

Method for producing siloxanes from alkali salts of silanols

Vulcanizates produced by crosslinking of mixtures including alpha-functional polysiloxanes have high relative permittivities at high electric breakdown strengths which renders them suitable as a dielectric material for applications in actuators, generators or sensors in robotics, orthopedics, electrically controllable 'artificial muscles,' and transducers producing electricity from kinetic energy.

Cross-linkable mixtures having alpha-functional polysiloxanes

The content of phosphorus in polycrystalline silicon prepared by the Siemens process is reduced by treating phosphorus-containing steel surfaces with an &#x3b1;-amino-functional alkoxysilane. The treated surface exhibits less corrosion in an atmosphere of moist hydrogen chloride, and less loss of phosphorus as a result.

Treatment of steel surfaces

Solid silanol salts are produced by drying an alkali siliconate solution in a fixed bed dryer containing solids.

Method for producing solids from alkali salts of silanols

The invention relates to a method (a) for producing aminoorganyltriorganylsilanes of the general formula (1) R'RSi&#x2014;R&#x2014;NRR(1), a method (b) for producing cyclic aminosilanes of the general formula (4), and a method (III) for producing silylorganoamines of the general formula (7) RRSi&#x2014;R&#x2014;NR&#x2014;R&#x2014;SiRR(7), wherein amines are reacted with halogen organylsilanes, wherein R&#x2032;, R, R, R, R, R, R, R, R, R, R, R, R, R, R, n, and s have the meanings specified in claims 1 to 3, wherein after the reaction, the ammonium halides of the amines produced as by-products are released by adding a base (B) to the reaction mixture, the amines are removed from the reaction mixture by distillation, two liquid phases are formed by further adding base (B) to the reaction mixture, wherein the one phase contains at least 90 wt % of the hydrohalide of the base (B) and said phase is separated. 

Method for producing aminoorganosilanes

Solid alkali metal salts of organosilanols and/or their hydrolysis/condensation products are prepared by hydrolysis of organosilanes in water and in the presence of a basic alkali metal salt. The products contain predominately methyl and ethyl organic groups, and Cor higher hydrocarbon groups as well. The solid salts effectively hydrophobe building materials, while being easily mixed with water.

Organosiliconate powders, method for the production thereof and use thereof for hydrophobizing mineral building materials

The invention provides a process for preparing carbamatoorganosilanes (S) of the general formula (7) in which a haloorganosilane (S1) of the general formula (8) is reacted with a metal cyanate (MOCN) and an alcohol (A) of the general formula (9) in the presence of at least one aprotic solvent (L), where R, Rand Rare each an unsubstituted or halogen-substituted hydrocarbyl radical having 1-10 carbon atoms, Ris a divalent unsubstituted or halogen-substituted hydrocarbyl radical which has 1-10 carbon atoms and may be interrupted by nonadjacent oxygen atoms, X is a halogen atom, and x is a value of 0, 1, 2 or 3, where the removal of the solid metal halides formed as by-products and of any solid metal cyanate residues still present is preceded by distillative removal of at least 50% of the solvent (L).

Process for preparing carbamatoorganosilanes

Organosilanolate powders having a low cation to silicon ratio provide superior hydrophobing ability. The powders may be prepared on an industrial scale by hydrolysis of a silane with a basic salt solution, adding an inert organic solvent, and removing gaseous or alcoholic hydrolysis products by evaporation or distillation, precipitating the organosilanolate as a fine powder.

Water-soluble organosiliconate powder

Trichlorosilane production is increased while simultaneously lowering environmental burden due to destruction and disposition of high boilers by feeding high boilers from trichlorosilane production or from polycrystalline silicon production into a fluidized bed for production of trichlorosilane from metallic silicon and hydrogen chloride.

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Ueberackern, Austria

Michael Stepp