Abstract: An organo(poly)siloxane (A) consists of units of general formula (I) RnSiO(4-n/2), where R is selected from the radicals R1, —OR2, Ru, RS and Q, wherein R1 denotes a monovalent substituted or unsubstituted hydrocarbon radical having 1 to 18 carbon atoms, R2 denotes a hydrogen atom or a monovalent substituted or unsubstituted hydrocarbon radical having 1 to 6 carbon atoms, Ru denotes a monovalent aliphatic unsaturated hydrocarbon radical having 2 to 18 carbon atoms, RS denotes a monovalent thiol-functionalized hydrocarbon radical, Q is a nitrogen functional group of formula (II) —CR5R6—NR4R3, where R3 and R4 each independently denote hydrogen or a substituted or unsubstituted hydrocarbon radical, and R5 and R6 each 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(OR7)2O1/2, at least 1 aliphatically unsaturated radical Ru, and at least 2 thiol-functionalized groups RS.

Abstract: A silicone composition, a method for coating a substrate and a process for producing a composite molding.

Abstract: Urea-functional organopolysiloxanes containing units of the formula RnSiO(4-n)/2??(I), where R is a radical R1 or a radical —OR2 or a radical Q, Q is a urea-functional radical of the formula —R5—[NR4—R6—]xNR4R3??(II), where the radicals R4 are identical or different and are each a radical R4? or a radical Ru, where R4? is hydrogen or a monovalent C1-C6-hydrocarbon radical where Ru is radical of the formula —C(?O)—NH2, and where at least one urea-functional radical Q having a radical Ru is present per molecule are prepared by reacting amino-functional organopolysiloxanes comprising units of the formula R?nSiO(4-n)/2??(IV), where A is an amino-functional radical of the formula —R5—[NR4?—R6—]xNR4?R3??(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 formula R7—Ar—O—C(?O)—NH2??(VI), where Ar is an ortho-substituted aryl radical.

Abstract: 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.

Abstract: Siloxanes bearing radicals of the formula -A-NR12-m(CR22—CR32—CN)m ??(2), are able to absorb SO2 and then safely desorb SO2 while minimizing thermal runaway conditions.

Abstract: Linear organopolysiloxanes of the structure M-(T-M)n-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.

Abstract: Urea-functional organopolysiloxanes containing units of the formula RnSiO(4-n)/2 ??(I), where R is a radical R1 or a radical —OR2 or a radical Q, Q is a urea-functional radical of the formula —R5—[NR4—R6—]xNR4R3 ??(II), where the radicals R4 are identical or different and are each a radical R4? or a radical Ru, where R4? is hydrogen or a monovalent C1-C6-hydrocarbon radical where Ru is radical of the formula —C(?O)—NH2, and where at least one urea-functional radical Q having a radical Ru is present per molecule are prepared by reacting amino-functional organopolysiloxanes comprising units of the formula R?nSiO(4-n)/2 ??(IV), where A is an amino-functional radical of the formula —R5—[NR4?—R6—]xNR4?R3 ??(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 formula R7—Ar—O—C(?O)—NH2 ??(VI), where Ar is an ortho-substituted aryl radical.

Abstract: Linear organopolysiloxanes of the structure M-(T-M)n-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.

Abstract: 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.

Abstract: Siloxanes which are liquid at 25° C. and 1 bar, have 2% to 12% by weight of silanol groups and are of the formula (1): MaDbTcQdM?eD?fT?g??(1), are prepared by reacting metal salts of silanols of the formula (2): R1Si(OH)4?l?m(O?Zr+/r)m??(2) or condensation products thereof with silanes of the formula (3): R?nSiX4?n??(3) in a ratio which is calculated by: mol of organosiliconate of the general formula (2): mol of silane of the general formula (3)=x*(4?n)/m, where x=0.8 to 1.2.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Siloxanes which are liquid at 25° C. and 1 bar, have 2% to 12% by weight of silanol groups and are of the formula (1): MaDbTcQdM?eD?fT?g ??(1), are prepared by reacting metal salts of silanols of the formula (2): R1Si(OH)4?l?m(O?Zr+/r)m ??(2) or condensation products thereof with silanes of the formula (3): R?nSiX4?n ??(3) in a ratio which is calculated by: mol of organosiliconate of the general formula (2): mol of silane of the general formula (3)= x*(4?n)/m, where x=0.8 to 1.2.

Abstract: 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.

Abstract: Alkali metal siliconates with low contents of water and alcohol are economically prepared in a three stage process where organoalkoxysilanes are reacted with a basic alkali metal salt to form an alcohol-rich hydrolysate, the hydrolysate is dried to a powder containing 0.5-5 wt. % alcohol, and residual alcohol is reduced in a post-treatment third step.

Abstract: Weathering-resistance and hydrophobicity of paints and coatings are enhanced by addition of a composition comprising an organopolysiloxanes bearing pendent aminoalkyl groups and fatty acid ester-based epoxy group-containing compounds.

Abstract: 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.

Abstract: Organopolysiloxanes containing a large proportion of methylene-bonded polar groups have high relative permittivities, and are especially useful as thermally stable dielectrics. A methoxymethyl alkoxysilane starting material is easily synthesized, and can be incorporated into the polymers by conventional methods known in organosilicon chemistry.

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