Wacker-chemie Gmbh

Karl-Heinrich Wegehaupt

Karl Braunsperger

Johann Muller

Jurgen Burkhardt

Dieter Gerhardinger

Wilhelm Marsch

Rudolf Kaufmann

Gunter Von Au

Jorg Patzke

Hans-Rudolf Pfeffer

Manfred Leiser

Volker Frey

Gerhard Preiner

August Schiller

Paul Hittmair

Gunter Stohr

Gerhard Kreis

Fridolin Stary

Carlos Weise

Ferdinand Pradl

Matthias Scherer

Wolfgang Wagner

G/u/ Nter Von Au

Rudolf Pusch

Hans R Pfeffer

Johannes Reisacher

A process for preparing diorganopolysiloxanes containing terminal triorganosiloxy groups which comprises reacting in a 1st step, a cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolyzate with from 0.05 to 3 percent by weight of triorganochlorosilane, based on the weight of the cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolyzate employed in the presence of from 1 to 50 ppm by weight of phosphonitrile chloride, based on the total weight of the organosilicon compounds employed, to form a reaction mixture containing .alpha.-triorganosiloxy-.omega.-chlorodiorganopolysiloxane, and in a 2nd step, adding to the reaction mixture obtained in the 1st step and containing the .alpha.-triorganosiloxy-.omega.-chlorodiorganopolysiloxane, a diorganopolysiloxane having one Si-bonded hydroxyl group in each of the terminal units in an amount of from 1 to 1.2 gram-moles of Si-bonded hydroxyl group in this diorganopolysiloxane per gram-atom of Si-bonded chlorine in the triorganochlorosilane, and in a 3rd step, adding hexaorganodisilazane to the reaction mixture of the 2nd step in order to deactivate the phosphonitrile chloride and remove hydrogen chloride from the diorganopolysiloxanes containing terminal triorganosiloxy groups and thereafter removing the low-boiling components by distillation.

Process for preparing diorganopolysiloxanes having terminal

A process for preparing diorganopolysiloxanes having terminal Si-bonded hydroxyl groups which comprises reacting an organosilicon compound selected from a cyclic diorganopolysiloxane, a diorganodichlorosilane hydrolysis product and mixtures thereof with from 0.1 to 3 percent by weight of a diorganodichlorosilane, based on the weight of the organosilicon compound, i.e., the cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolysis product employed, in the presence of from 1 to 50 ppm by weight of phosphonitrile chloride, based on the total weight of the organosilicon compound and diorganodichlorosilane employed, to form diorganopolysiloxanes containing an Si-bonded chlorine atom in each of the terminal units, then treating the reaction mixture with water or an aqueous solution, separating off the aqueous phase from the diorganopolysiloxanes containing an Si-bonded hydroxyl group in each of the terminal units and thereafter removing the low boiling constituents by distillation.

Process for preparing diorganopolysiloxanes having terminal Si-bonded

Organosilicon compounds and organopolysiloxane compositions which are crosslinked by the addition of Si-bonded hydrogen with SiC-bonded vinyl groups and contain the organosilicon compounds as additives for improving the adhesion of the resultant elastomers on the substrates on which they are formed.

Organosilicon compounds and crosslinkable organopolysiloxane

The invention relates to thermoinsulating moldings containing porous, inorganic thermoinsulating materials and having an organopolysiloxane coating thereon, in which an uncoated thermoinsulating molding is coated with a diorganopolysiloxane containing rod-shaped styrene-(meth)acrylate copolymers which are obtained from a free radical copolymerization of styrene and (meth)acrylate in the presence of the diorganopolysiloxane.

Thermoinsulating moldings containing a porous, inorganic

The present invention relates to a corrosion resistant coating for metal reinforcing structures that are used in porous concrete which comprises coating the metal reinforcing structures with an organopolysiloxane elastomer obtained by crosslinking a diorganopolysiloxane-based composition by the condensation reaction or by the addition of Si-bonded hydrogen to an aliphatic carbon-carbon double bond, in which the composition contains a copolymer that is obtained via a free radical copolymerization of styrene and a (meth)acrylic acid ester in the presence of the diorganopolysiloxane.

Anticorrosion coatings for porous concrete metal reinforcing structures

A method for improving the adhesion of elastomers derived from compositions which are crosslinked by a condensation reaction and which are based on diorganopolysiloxanes containing rod-shaped copolymers formed by the free-radical copolymerization of styrene and (meth)acrylic acid ester in the presence of the diorganopolysiloxanes, to an undercoating consisting of an epoxy resin and pitch or tar, which comprises applying a primer having SiC-bonded organic groups to the undercoating prior to the application of the crosslinkable composition, in which the primer consists of a solution of

Method for improving the adhesion of elastomers to a coated substrate

Asphaltic concrete surfaces are protected from undesirable changes by applying a composition comprising a diorganopolysiloxane containing rod-shaped styrene-n-butyl acrylate copolymers which are obtained from the free-radical copolymerization of said monomers in the presence of the diorganopolysiloxane onto an asphaltic concrete surface and thereafter crosslinking the diorganopolysiloxane composition to form an elastomeric coating thereon. The asphaltic concrete surface may be coated with a primer prior to the application of the crosslinkable diorganopolysiloxane composition in order to improve the adhesion of the resultant crosslinked elastomer containing the rod-shaped copolymers. These asphaltic concrete coatings are especially useful in, for example, hydraulic engineering.

Protective coatings for asphaltic concrete surfaces and methods for

A method for preparing diorganopolysiloxanes containing fluoroalkyl and/or fluoroalkyloxyalkyl groups which comprises hydrolyzing dichlorosilanes containing fluororalkyl and/or fluoroalkyloxyalkyl groups and thereafter equilibrating the hydrolyzed product in the presence of a compound having the formula

Method for preparing diorganopolysiloxanes containing fluoroalkyl groups

Compositions which are stable in the absence of moisture, but crosslink to form elastomers in the presence of moisture at room temperature comprising a diorganopolysiloxane having terminal condensable groups and a silicon compound having at least three oxime groups per molecule bonded to silicon via oxygen, in which a mixture containing a silane having four oxime groups bonded to a silicon atom via oxygen, and a silane having a hydrocarbon radical bonded to a silicon atom via a SiC-bonding and having three oxime groups bonded to the silicon atom via oxygen, or an oligomer of the silane mixture is substituted for at least a portion of the silicon compound having at least three oxime groups per molecule bonded to silicon via oxygen.

Oxime containing compositions which crosslink in the presence of

Hydrophobic fibers are prepared by treating fibers with a composition containing an organopolysiloxane having Si-bonded hydrogen atoms as essentially its only reactive group, and a platinum catalyst which is inhibited by a compound which is volatile under the conditions at which the organopolysiloxane containing Si-bonded hydrogen atoms is deposited on the fiber.

Method for imparting hydrophobic properties to fibers

Hydrophilic coatings are obtained by applying to a substrate a composition containing an aqueous soluble organopolysiloxane which is capable of being crosslinked by the addition of Si-bonded hydrogen atoms to SiC-bonded aliphatic multiple bonds, and having at least one oxyalkylene unit bonded to a silicon atom and an aqueous soluble catalyst which promotes the addition of Si-bonded hydrogen atoms to the SiC-bonded aliphatic multiple bonds and thereafter crosslinking the organopolysiloxane by the addition of the Si-bonded hydrogen atoms to the SiC-bonded aliphatic multiple bonds to form a hydrophilic coating on the substrate. The aqueous soluble organopolysiloxane may be obtained from a mixture consisting of equal parts of a mixed hydrolysate, prepared from 1.7 moles of dimethyldichlorosilane, 1 mole of [acetoxy-(hexaethyleneoxy)propyl]-methyldichlorosilane and 0.3 mole of vinylmethyldichlorosilane, and a mixed hydrolysate prepared from 1 mole of dimethyldichlorosilane, 1 mole of [acetoxy(hexaethyleneoxy)-propyl]-methyl-dichlorosilane and 1 mole of methyldichlorosilane.

Hydrophilic coatings and process for preparing the same

Elastomers which are obtained by crosslinking an organopolysiloxane composition containing a diorganopolysiloxane, an organic peroxide and calcium hydroxide which has been treated with an organosilicon compound to impart hydrophobic properties thereto.

Organopolysiloxane elastomers

Organopolysiloxanes having substituted carbamoyloxy groups (.tbd.SiOCO--NH--) bonded to silicon via oxygen, which are prepared by reacting an organopolysiloxane containing Si-bonded hydroxyl groups with an organic isocyanate in the presence of an organic tin compound. The stability of the organopolysiloxanes containing carbamoyloxy groups may be improved if the organopolysiloxane having Si-bonded hydroxyl groups is reacted with an organic isocyanate in the presence of an organic tin compound which is supported on a solid carrier and then the reaction product is filtered under anhydrous conditions to remove the supported organic tin compound.

Process for the preparation of organopolysiloxanes

Silicon containing compounds having Si-bonded hydrogen are added to an aliphatic multiple bond in the presence of a platinum catalyst selected from the group consisting of platinum compounds of the formula

Addition of Si-bonded hydrogen to an aliphatic multiple bond

A method for stabilizing organopolysiloxanes which are obtained from the condensation and/or equilibration of organosilicon compounds in the presence of phosphoronitrile chlorides which comprises treating the organopolysiloxanes with ammonia or an amine of the general formula

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Burghausen, Germany

Karl-Heinrich Wegehaupt