Abstract: The invention relates to a ceramic flash TV evaporator for the evaporation coating of picture tubes with aluminum, containing a cavity whose width tapers in cross section through the evaporator from the upper edge of the evaporator to the lower edge of the evaporator, which is defined by the fact that the transition of the side walls of the evaporator to the underside of the evaporator is elliptically rounded in cross section at least over part of the longitudinal axis of the evaporator.
Abstract: Shaped body based on polycrystalline SiC and having a density of greater than 90% of its theoretical density and graphite layer on its surface, wherein the graphite layer is crystalline, has a thickness of 0.1-100 &mgr;m and has been produced by thermal surface decomposition of the SiC after it has been sintered to closed porosity.
Type:
Application
Filed:
September 6, 2001
Publication date:
June 20, 2002
Applicant:
Wacker-Chemie GmbH
Inventors:
Hubert Thaler, Karl Schwetz, Armin Kayser
Abstract: The invention provides a process for preparing adhesives having improved adhesion, in the form of their aqueous dispersions or water-redispersible dispersion powders, by emulsion polymerization in the presence of polyvinyl alcohol with or without drying of the dispersion obtainable by this process, which comprises polymerizing a comonomer mixture comprising
Abstract: The invention provides a process for heterophase reactions in a liquid or supercritical dispersion medium, in which the starting materials are introduced into the reaction zone of a reactor provided with one or more enrichment zones and the reaction product or unreacted starting material or both starting material and reaction product are discharged via one enrichment zone in each case, wherein a) the reaction product together with the dispersion medium is discharged from the reactor via an enrichment zone, the reaction product is separated off and the dispersion medium is, if desired in countercurrent to the reaction product/dispersion medium mixture and via an enrichment zone, returned to the reaction zone, or b) unreacted starting material together with the dispersion medium is discharged, the starting material is separated from the dispersion medium and returned directly to the reaction zone and the dispersion medium is, if desired, in countercurrent to the reaction product/dispersion medium mixture and vi
Type:
Grant
Filed:
October 13, 1999
Date of Patent:
June 11, 2002
Assignee:
Wacker Chemie GmbH
Inventors:
Wolf-Dieter Hergeth, Richard Becker, Mehmet Gunaltay, Herbert Jekat, Frank Rindfleisch, Heribert Wendenburg
Abstract: A composition which is useful for producing profiles and cable insulation which retain their function in the event of fire, comprise peroxidically crosslinking or condensation-crosslinking silicone rubber, metal oxides selected from magnesium oxide, aluminum oxide, tin oxide, calcium oxide and barium oxide and metal compounds of this class which produce oxides on heating, boric acid, zinc borate, and a platinum complex having at least one unsaturated group.
Type:
Grant
Filed:
December 1, 1999
Date of Patent:
May 14, 2002
Assignee:
Wacker-Chemie GmbH
Inventors:
Dietrich Wolfer, Wilhelm Marsch, Peter Gerhardinger
Abstract: The present invention provides polishes for surfaces, comprising aminoorganopolysiloxanes (A) which are solid at room temperature, contain fluoro groups and are able to change their aggregate state reversibly as a result of changes in temperature.
Type:
Grant
Filed:
May 18, 2000
Date of Patent:
May 14, 2002
Assignee:
Wacker-Chemie GmbH
Inventors:
Bors C. Abele, Günter Mahr, Jörn Winterfeld, Franz Wimmer, Anton Spannbrucker
Abstract: A method for conveying silicon fragments has the silicon fragments being conveyed over a conveyor surface, which is made from hyperpure silicon. There is a vibrating conveyor, and during the conveying, the sharp edges of the silicon fragments are rounded and mechanical-physical decontamination takes place. The vibrating conveyor has a conveyor surface which is made from hyperpure silicon. A second vibrating conveyor unit has a conveyor surface which is made from hyperpure silicon and has passage openings therethrough.
Type:
Grant
Filed:
March 29, 2000
Date of Patent:
April 23, 2002
Assignee:
Wacker-Chemie GmbH
Inventors:
Dirk Flottmann, Franz Köppl, Matthäus Schantz, Friedrich Steudten
Abstract: The invention relates to thickeners based on fully or partially hydrolyzed vinyl alcohol copolymers with a molecular weight Mw greater than 100,000, obtainable by hydrolyzing vinyl acetate copolymers which, besides vinyl acetate units, also contain comonomer units which derive from one or more comonomers selected from the group consisting of 1-(C1-5)-alkylvinyl esters of C1-5 carboxylic acids, allyl esters, vinyl esters of alpha-branched C5-12 carboxylic acids, and C1-18-alkyl (meth)acrylates, in the form of their aqueous solution or in powder form.
Type:
Application
Filed:
August 9, 2001
Publication date:
April 11, 2002
Applicant:
Wacker-Chemie GmbH
Inventors:
Theo Mayer, Werner Bauer, Harald Zeh, Bernd Kayser, Andreas Bacher, Ulf Dietrich
Abstract: The invention relates to a process for consolidating and hydrophobicizing soil materials of clay type or of siliceous type, using alkali metal silicates and alkali metal siliconates.
Abstract: The invention relates to the use of acetalized vinyl alcohol polymers with a molecular weight Mw greater than 100 000 as thickeners, the thickeners being obtained by acetalizing partially or fully hydrolyzed vinyl acetate homopolymers, or partially or fully hydrolyzed vinyl acetate copolymers which, besides vinyl acetate units, also contain comonomer units which derive from one or more comonomers selected from the group consisting of 1-(C1-5) alkylvinyl esters of C1-5 carboxylic acids, allyl esters, vinyl esters of alpha-branched C1-12 carboxylic acids, and C1-8-alkyl (meth)acrylates.
Type:
Application
Filed:
August 9, 2001
Publication date:
April 4, 2002
Applicant:
Wacker-Chemie GmbH
Inventors:
Bernd Kayser, Andreas Bacher, Werner Bauer, Ulf Dietrich, Marion Schmitz, Harald Zeh, Theo Mayer
Abstract: Organopolysiloxane compositions prepared from an organopolysiloxane and a crosslinking agent comprising bis-4-methylbenzoyl peroxide (PMBP) and at least one compound from the group consisting of benzoyl peroxide, dicumyl peroxide, 2,5-dimethyl-hexane-2,5-di-tert-butyl peroxide (DHBP) and di-tert-butyl peroxide exhibit less tendency to yellow upon vulcanization, and can produce tear resistant, substantially odor free vulcanizates.
Abstract: A method is for processing semiconductor material, in which one or more shock waves generated using a transducer are transmitted through a liquid medium to semiconductor material in rod form. The transducer is at a distance of from 1 cm to 100 cm from the semiconductor material, and the shock waves have a pulse energy of from 1 to 20 kJ and a pulse rise time to the energy maximum of from 1 to 5 &mgr;s.
Abstract: A process for preparing polyvinyl-alcohol-stabilized polymers based on vinyl ester, ethylene, and optionally other comonomers, in the form of aqueous polymer dispersions or water-redispersible polymer powders, by means of free radical initiated continuous emulsion polymerization and optionally drying the resultant polymer dispersion, comprising carrying out the emulsion polymerization in minimally two pressurized reactors arranged in series at a temperature of from 40° C. to 100° C. and at a pressure of from 5 to 100 bar, to a residual monomer content less than 3% by weight, and continuing the polymerization in minimally one unpressurized reactor at a temperature of from 20° C. to 60° C. and at a pressure of less than 1.0 bar, wherein the polymerization is initiated using a redox system made from an oxidizing component and a reducing component, at least a portion of the reducing component introduced within the first pressurized reactor.
Abstract: The invention relates to particles comprises of organopolysiloxane microgel particles having a diameter of 5 to 200 nm and organo-aluminum compounds immobilized thereon. The particles can be used as cocatalysts together with metal compounds of the 4, 5, 6 and 8-10 sub-groups of the periodic table for oligomerization, cyclization of polymerization of olefins.
Type:
Grant
Filed:
April 19, 2000
Date of Patent:
March 19, 2002
Assignee:
Wacker-Chemie GmbH
Inventors:
Helmut Alt, Frank Baumann, Johann Weis, Alexander Köppl
Abstract: Curable addition crosslinkable organopolysiloxane materials employing a platinum catalyst selected from the group consisting of compounds of the formula
and/or oligomeric or polymeric compounds which are composed of structural units of the general formula
and optionally structural units of the general formula
R9rSiO(4−r)/2
in which
R2, R3, R4, R6, R7, R8, R9, r, s and t have the meanings stated in claim 1, may be prepared as one-component formulations having prolonged shelf life, or as two-component formulations having prolonged pot life, while maintaining desirable chemical and physical properties.
Abstract: The invention relates to a process for treating filter dusts which are produced during the melting of inorganic compounds, especially those containing fluorides and/or oxides, in which process the filter dusts are fused. The disposal of the fused filter dusts is simple.
Type:
Grant
Filed:
February 25, 2000
Date of Patent:
March 12, 2002
Assignee:
Wacker-Chemie GmbH
Inventors:
Wilfried Kalchauer, Karl Hutzler, Hubert Bruckmeier
Abstract: A continuous process for the polymer-analogous reaction of polymers bearing functional groups with reactive compounds, wherein in a first step, a mixture is prepared from the polymers bearing functional groups and the reactive compounds, and in a second step, the mixture is conducted continuously through a reaction zone and brought to reaction there.
Type:
Grant
Filed:
April 13, 1999
Date of Patent:
February 26, 2002
Assignee:
Wacker-Chemie GmbH
Inventors:
Frank Baumann, Otto Rothenaicher, Bernward Deubzer, Monika Heindl
Abstract: The invention relates to mixtures of linear organosiloxanes of the general formula 1
R3SiO—(SiR2O)n—SiR3 (1),
where
R can be identical or different and is a hydrocarbon radical having from 1 to 18 carbon atoms which is optionally substituted by fluorine, chlorine or cyano radicals and is free from ethylenically or acetylenically unsaturated bonds, and
n has values from 0 to 20,
where the mean number of carbon atoms of the radicals R is at most 3 and
where the mixtures have evaporated, measured in accordance with DIN 53249,
to an extent of from 80 to 95% by weight after 30 minutes,
to an extent of from 90 to 99% by weight after 60 minutes and
to an extent of from 95 to 100% by weight after 120 minutes.
The mixtures of linear organosiloxanes are added to cosmetic formulations.
Type:
Grant
Filed:
August 13, 1999
Date of Patent:
February 26, 2002
Assignee:
Wacker-Chemie GmbH
Inventors:
Thomas Koini, Thomas Köhler, Annemarie Huber, Manfred Meisenberger, Marianne D. Berthiaume