Wacker-Chemie Gmbh

Wacker Chemie Ag

Buss-Sms-Canzler Gmbh

Johann Schuster

Horst Muller

Thomas Hierstetter

Volker Frey

Richard Weidner

Herbert Barthel

Otto Schneider

Nils Becker

Michael Stepp

Josef Fuerst

Anton Maier

Johann Mersch

Herbert Eck

Gerald Fleischmann

Rudolf Hager

Mario Heinemann

Fridolin Stary

Manfred Heisler

Rainer Naef

Richard Birneder

Otto Rothenaicher

Stefan Dietl

Christof Woerner

Ferdinand Pradl

Martin Piehler

August Altenbuchner

Ludwig Hager

Alois Schlierf

Dieter Duschl

Thomas Frese

Stefan Schneiderbauer

Helmut Vorbuchner

Kerstin Zeiler

Helmut Wohrl

Peter Webeck

Hermann Blank

Dominik Becher

Heinrich Glocklhofer

Christof Wörner

Gerhard Skroch

Helmut Woehrl

Claus Hoefl

Lutz Eismann

Claus HÖFL

Reinhard Rothenaicher

Volatile siloxanes, particularly those of a cyclic nature, are removed from high viscosity silicone polymers and high viscosity silicone compositions by evaporation in a short path evaporator.

Devolatization of highly viscous silicone fluids in the short path evaporator

Irradiation curable addition crosslinkable organosilicon compositions employ a cyclopentadienyl platinum photocatalyst, and are rendered storage stable by incorporation of selected organophosphorus compounds, while cure is substantially unaffected.

Silicone compositions crosslinkable by irradiation with UV light

A housing having a heatable housing jacket, which surrounds a treatment chamber and forms a rotationally symmetrical treatment surface extending in the axial direction, and a drivable rotor, arranged in the treatment chamber and extending coaxially, for producing a material film on the treatment surface. The rotor comprises a hollow shaft, arranged in a manner distributed over the circumference of which are spreading elements. The hollow shaft surrounds a condensation space, in which a condenser is arranged. At least some of the spreading elements are configured as transport elements, which impart a transporting component to the material in the direction from the material inlet to the material outlet. Some of the spreading elements are configured as transport elements and some as distributing elements, which project from the hollow shaft and which comprise teeth, the shearing edge of which encloses an angle of less than 45&#xb0; relative to the axial direction.

Device for the thermal treatment of viscous material, in particular for the thermal separation of material components contained in viscous material

Organosilicon compounds in a process exhaust stream from silicone production are removed by contacting the exhaust stream with a semipermeable silicone membrane which is selectively permeable to organosilicon compounds and oxygen relative to nitrogen. The pressure on the permeate side of the membrane is preferably less than the pressure on the retentate side.

Continuous process for cleaning process waste air obtained in the production of silicones

Organopolysiloxane compositions having a 25&#xb0; C. viscosity of at least 500 Pa&#xb7;s., are continuously prepared by mixing and kneading organopolysiloxanes and fillers in a first process stage, in a kneading cascade having at least two kneading chambers arranged in series each containing two kneading tools on parallel axes, capable of being driven in corotating or counterrotating directions, the chambers connected to one another by means of openings through which material can pass in a direction transverse to the axes of the kneading tools, the first kneading chamber having a feed opening and the last kneading chamber having a discharge opening, to give raw mixtures and kneading and degassing the raw mixtures, in a second process stage at from 100&#xb0; C. to 250&#xb0; C. in a continuously operated double trough kneader having a discharge screw.

Process for the continuous preparation of high viscosity silicon compositions

Base compositions for addition-crosslinking silicone compositions are continuously produced by, in a first stage, homogeneously mixing and kneading organopolysiloxanes and flowable prehydrophobized oxidic reinforcing fillers in a continuous kneading machine with kneading chambers arranged alongside one another. In a second, downstream, stage of the process, the compositions produced in the first stage are subjected to aftertreatment in a mixing apparatus in which the compositions have been subjected to a mixing procedure with introduction of shear force.

Continuous process for the production of base compositions for improved-stability silicone compositions

Base compositions for silicone compositions with viscosity &#x3c;500,000 mPas are continuously produced by, in a first stage, homogeneously mixing and kneading organopolysiloxanes (A) and prehydrophobized oxidic reinforcing fillers (B) in a continuous kneading cascade with kneading chambers arranged alongside one another, and in a second downstream stage, the compositions produced in the first stage of the process are subjected to aftertreatment in a mixing apparatus where the compositions have been subjected to a mixing procedure with introduction of shear force.

Continuous process for the production of organopolysiloxane compositions

A process for preparing organopolysiloxane compositions (A) having a viscosity measured at 25&#xb0; C. of at least 500 Pa&#xb7;s., wherein organopolysiloxanes (O) and fillers (F) are mixed and kneaded in a first process stage in a kneading cascade having at least two kneading chambers arranged in series adjacent one another, each containing kneading tools having parallel axes and capable of being driven in co-rotating or counter-rotating directions, the chambers connected to one another by means of openings through which material can pass in a direction transverse to the axes of the kneading tools, with the first kneading chamber having a feed opening and the last kneading chamber having a discharge opening, to give raw mixtures, and the raw mixtures are kneaded and degassed in a reciprocating kneader in a second process stage.

Process for the continuous preparation of high-viscosity silicone compositions

A process for the continuous preparation of addition-crosslinking silicone rubbers from a base composition containing at least one polyvinyl polysiloxane and at least 10% by weight, based on the liquid silicone rubber, of hydrophobicized filler, by removing the base composition from a container whose volume reduces proportionally with the amount removed, and conveying the composition by way of a pump with a positive pressure difference to two further pumps () which convey the base composition onward, so a component A is prepared continuously by admixing at least one metal catalyst with one stream of the base composition, and a component B is prepared continuously and simultaneously by admixing the crosslinker and inhibitor with a second stream of the base composition, where the metal catalyst, crosslinker, and inhibitor are fed by way of a feed unit which meters in each of the substances.

Process for the continuous preparation of two-component addition-crosslinking silicone compositions

The invention relates to crosslinkable materials based on organopolysiloxanes. Said materials are characterized in that in addition to organopolysiloxanes they contain at least one low-molecular organosilicon compound with 2 to 17 silicon atoms comprising units of the formula (I) R R (OR ) SiO , R , R , R , a, b and c having the meaning given in claim 1 provided that low-molecular organosilicon compounds comprising units of the formula (I) where b is 0 have at least one unit of the formula (I) in which a is 0 or 1, and at least one unit of the formula (I) in which a is 3.

Crosslinkable organopolysiloxane materials

The invention relates to aliphatically unsaturated organosilicon compounds having 2 to 17 silicon atoms, to processes for their preparation and to their use in crosslinkable organopolysiloxane compositions, especially in compositions which can be crosslinked peroxidically or by hydrosilylation.

Organosilicon compounds, processes for their preparation, and their use in crosslinkable organopolysiloxane compositions

The organopolysiloxane compositions are prepared by mixing

Process for the preparation of storage-stable organopolysiloxane

Organosilicon compounds, processes for their preparation, and their use

The organopolysiloxane compositions are prepared by

Continuous process for preparing storage-stable organopolysiloxane

Organopolysiloxane resin powders having a mean particle diameter (median value d.sub.50,3) of from 70 to 300 .mu.m and a proportion of resin particles having a diameter &lt;45 .mu.m of less than 5 percent by weight, based on the total weight of the organopolysiloxane resin powder.

Organopolysiloxane resin powder, process for its preparation and its use

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Emmerting, Germany

Johann Schuster