Abstract: The invention describes (i) reaction systems for the production of siloxanes bearing acetoxy functions, comprising a) silanes and/or siloxanes bearing alkoxy groups and/or b) silanes and/or siloxanes bearing acetoxy groups, c) silanes and/or siloxanes bearing hydroxy groups, d) optionally simple siloxane cycles and/or DT cycles, e) a reaction medium, comprising acetic anhydride, perfluoroalkanesulfonic acid and preferably acetic acid, (ii) a process for producing linear or branched siloxanes bearing acetoxy functions and also the use of same for producing polyethersiloxanes.

Abstract: Compounds are based on polyether-modified polybutadiene, where the polyether-modified polybutadiene contains repeat units selected from the divalent radicals: The radical B has at least one ester group.

Abstract: A universal adhesion promoter contains a compound based on polybutadiene having at least one repeat unit selected from the following divalent radicals:

Abstract: A defoamer composition contains a compound based on polybutadiene having at least one repeat unit selected from the divalent radicals:

Abstract: A reaction product containing a non-cyclic alkoxy-functional polysiloxane is produced by heating a reaction system, which contains a cyclic polyorganosiloxane of the formula [(R12SiO)2/2]n, where the subscript n is an integer of at least 4 and each R1 is an alkyl group or aryl group; a silane of the formula R2(4?m)Si(OR3)m, where the subscript m is an integer from 1 to 4, each R2 independently is an alkyl group or aryl group, a hydrocarbyl group or a halogenated hydrocarbyl group and each R3 independently is an alkyl group; and a catalyst system comprising a metal trifluoromethanesulfonate of the formula [M]+[CF3SO3]?, where M is a metal atom selected from sodium (Na) and potassium (K), and a Brønsted acid, wherein Brønsted acids having a pKa?3.0, preferably having a pKa?2.0, particularly preferably having a pKa??0.0 are used.

Abstract: Branched SiOC-linked polyethersiloxanes have the following formula (I) where R1 is an alkyl radical having 1 to 4 carbon atoms or a phenyl radical, but preferably 90% of the radicals R1 are methyl radicals; b has a value of from 1 to 10; a has a value of from 1 to 200, preferably 10 to 100, a value of from 3 to 70 when b is ?1 and ?4, or a value of from 3 to 30 when b is >4; and R2 denotes identical or different polyether radicals, but at least one radical R2 is a structural element radical of formula (II): where p=at least 2, preferably p=2-6, particularly preferably p=3.

Abstract: SiOC-based polyethersiloxanes are prepared based on linear ?,?-hydroxy group-bearing siloxanes. In a first step, ?,?-acetoxy group-bearing linear polysiloxanes are prepared. In a second step, the ?,?-acetoxy group-bearing linear polysiloxanes are converted into the desired organosiloxane units, preferably shorter organosiloxane units, wherein the thus converted organosiloxane units have ?,?-acetoxy groups. In a third step, the ?,?-acetoxy group-bearing linear polysiloxanes from step 2 react with polyetherols to give SiOC-based polyethersiloxanes.

Abstract: The invention describes (i) reaction systems for the production of siloxanes bearing acetoxy functions, comprising a) silanes and/or siloxanes bearing alkoxy groups and/or b) silanes and/or siloxanes bearing acetoxy groups, c) silanes and/or siloxanes bearing hydroxy groups, d) optionally simple siloxane cycles and/or DT cycles, e) a reaction medium, comprising acetic anhydride, perfluoroalkanesulfonic acid and preferably acetic acid, (ii) a process for producing linear or branched siloxanes bearing acetoxy functions and also the use of same for producing polyethersiloxanes.

Abstract: SiOC-bonded polyether siloxanes are produced by transesterification of alkoxysiloxanes with polyetherols in the presence of trifluoromethanesulfonate as catalyst. The computational total water content of the reactants including alkoxysiloxanes and polyetherols is ?5000 ppm by mass, advantageously ?300 ppm by mass, preferably ?150 ppm by mass, more preferably ?100 ppm by mass, in particular ?50 ppm by mass. The determination of the individual water contents is performed beforehand, preferably by titration according to Karl Fischer.

Abstract: An aqueous polyorganosiloxane hybrid resin dispersion can include at least one polyorganosiloxane hybrid resin, at least one amphiphilic emulsifier, and water.

Abstract: A binder for a marine coating composition comprising the reaction product of a polysiloxane unit A? and at least one second monomer B? that undergoes a polymerisation reaction with said polysiloxane unit A? so as to form a copolymer of structure -[ABAB]- wherein the backbone of said copolymer comprises a plurality of hydrolysable ester functional groups that will hydrolyse in the presence of seawater.

Abstract: A reaction product containing a non-cyclic alkoxy-functional polysiloxane is produced by heating a reaction system, which contains a cyclic polyorganosiloxane of the formula [(R12SiO)2/2]n, where the subscript n is an integer of at least 4 and each R1 is an alkyl group or aryl group; a silane of the formula R2(4?m)Si(OR3)m, where the subscript m is an integer from 1 to 4, each R2 independently is an alkyl group or aryl group, a hydrocarbyl group or a halogenated hydrocarbyl group and each R3 independently is an alkyl group; and a catalyst system comprising a metal trifluoromethanesulfonate of the formula [M]+[CF3SO3]?, where M is a metal atom selected from sodium (Na) and potassium (K), and a Brønsted acid, wherein Brønsted acids having a pKa?3.0, preferably having a pKa?2.0, particularly preferably having a pKa??0.0 are used.

Abstract: Branched SiOC-linked polyethersiloxanes have the following formula (I) where R1 is an alkyl radical having 1 to 4 carbon atoms or a phenyl radical, but preferably 90% of the radicals R1 are methyl radicals; b has a value of from 1 to 10; a has a value of from 1 to 200, preferably 10 to 100, a value of from 3 to 70 when b is ?1 and ?4, or a value of from 3 to 30 when b is >4; and R2 denotes identical or different polyether radicals, but at least one radical R2 is a structural element radical of formula (II): where p=at least 2, preferably p=2-6, particularly preferably p=3.

Abstract: SiOC-bonded polyether siloxanes are produced by transesterification of alkoxysiloxanes with polyetherols in the presence of trifluoromethanesulfonate as catalyst. The computational total water content of the reactants including alkoxysiloxanes and polyetherols is ?5000 ppm by mass, advantageously ?300 ppm by mass, preferably ?150 ppm by mass, more preferably ?100 ppm by mass, in particular ?50 ppm by mass. The determination of the individual water contents is performed beforehand, preferably by titration according to Karl Fischer.

Abstract: SiOC-based polyethersiloxanes are prepared based on linear ?,?-hydroxy group-bearing siloxanes. In a first step, ?,?-acetoxy group-bearing linear polysiloxanes are prepared. In a second step, the ?,?-acetoxy group-bearing linear polysiloxanes are converted into the desired organosiloxane units, preferably shorter organosiloxane units, wherein the thus converted organosiloxane units have ?,?-acetoxy groups. In a third step, the ?,?-acetoxy group-bearing linear polysiloxanes from step 2 react with polyetherols to give SiOC-based polyethersiloxanes.

Abstract: A curable composition can have a surface with amphiphilic properties which is thus able to counteract biofouling. The curable composition includes: a component A: at least one polysiloxane, a component B: at least one polyether bearing silyl groups and/or a reaction product of a polyether bearing silyl groups with one or more isocyanate-containing compounds, and a component C: at least one catalyst.

Abstract: The present invention provides for the use of nitrogen compounds of formula (I) and/or of corresponding quaternized and/or protonated compounds for production of polyurethanes, compositions containing these compounds and polyurethane systems, especially polyurethane foams, which have been obtained using the compounds.

Abstract: An aqueous polyorganosiloxane hybrid resin dispersion includes at least one polyorganosiloxane hybrid resin and at least one emulsifier based on partly hydrolysed polyvinylacetates. The dispersion has a solids content of 30.0% by weight-70.0% by weight, preferably 45.0% by weight-55.0% by weight, based on the polyorganosiloxane hybrid resin dispersion, and the residual solvent content is <6.0% by weight, preferably <2.5% by weight, more preferably <1.0% by weight, based on the polyorganosiloxane hybrid resin dispersion.

Abstract: The use of zinc ketoiminate complexes in the production of polyurethanes is described, wherein the zinc ketoiminate complexes are obtainable by reacting a zinc compound with certain ketimines.

Abstract: The use of zinc ketoiminate complexes in the production of polyurethanes is described, wherein the zinc ketoiminate complexes are obtainable by reacting a zinc compound with certain ketimines.