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Wacker Chemie Ag
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Wacker Chemie Ag patents


Recent patent applications related to Wacker Chemie Ag. Wacker Chemie Ag is listed as an Agent/Assignee. Note: Wacker Chemie Ag may have other listings under different names/spellings. We're not affiliated with Wacker Chemie Ag, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "W" | Wacker Chemie Ag-related inventors


Method for producing pulverulent solids from alkali salts of silanols

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.... Wacker Chemie Ag

Method for producing organically modified aerogels

The invention relates to a method for producing organically modified aerogels. The problem addressed by the invention is that of providing an economical method for producing hydrophobic aerogels which can be implemented cost-effectively, simply, and safely, and which operates to save on resources. This problem is solved by the provision... Wacker Chemie Ag

Method for producing molded bodies

3D moldings are prepared by applying a viscoelastic supportive material comprising a polyether and a particulate reheological additive in at least some positions where a curable structure forming material is not desired, and following completion of the molding, the supportive material is removed.... Wacker Chemie Ag

Aqueous dispersions of organosilicon compounds

Aqueous dispersions which are storage stable and cure to tack-free elastomers upon removal of water contain water, alkoxysilyl-terminated polyethers and alkoxy-functional siloxanes, optionally catalysts, fillers, and other additives customary in dispersions of organosilicon compounds.... Wacker Chemie Ag

Method for purifying contaminated gaseous hydrogen chloride

Impure gaseous hydrogen chloride from organochlorosilane hydrolysis is freed of impurities by first scrubbing with an organochlorosilane, which may be the same or different from the organochlorosilane(s) hydrolyzed, and then further scrubbing with chloromethane. The purified gaseous hydrogen chloride is preferably used in chlorosilane synthesis.... Wacker Chemie Ag

Branched organosiloxanes used as heat transfer fluid

The invention relates to a method for operating a system at an operating temperature of between 300° C. and 500° C., using a heat transfer fluid comprising branched siloxanes of general formula (I) (R3SiO1/2), (SiO4/2) in which w represents integral values of between 4 and 20, z represents integral values... Wacker Chemie Ag

Method for polymerising ethylenically unsaturated monomers

The invention relates to a method for polymerising ethylenically unsaturated monomers by free-radical initiated emulsion polymerisation in an aqueous medium in a polymerisation reactor, wherein the inside walls and optionally also the fittings in the reactor are coated by applying a deposit-inhibiting product before the reactor is filled, characterised in... Wacker Chemie Ag

Cross-linkable coating compounds based on organyl-oxysilane-terminated polymers

Floor coatings with improved properties are prepared from alkoxysilyl-functional polymers, silicone resins with a high alkoxy group content, and a filler component, at least a portion of which contains large particle sizes.... Wacker Chemie Ag

Nitriles and amines as electrolyte components for lithium-ion batteries

An electrolyte containing vinylene carbonate, an amine, a nitrile, and a conductive lithium salt is useful in lithium ion batteries to improve discharge retention after multiple charge/discharge cycles.... Wacker Chemie Ag

Cyclic phosphonamides as an electrolyte component for lithium-ion batteries

n has a value of 0, 1, 2, 3, 4 or 5. The electrolyte is used in a lithium-ion battery which comprises a cathode, an anode, a separator, and the electrolyte.... Wacker Chemie Ag

Reactor for the deposition of polycrystalline silicon

Reflective silver coatings on the inside surfaces of a Siemens reactor for polycrystalline silicon production are improved by a cold forming after-treatment of the silver coating.... Wacker Chemie Ag

Method for producing organopolysiloxanes

Highly condensed silicon resins are obtained by a three step continuous procedure without the use of organic solvent, by preliminarily forming a partial alkoxylate by reacting a chlorosilane with alcohol containing no or a minimal amount of water, feeding the partial alkoxylate to a reaction column to form a silicone... Wacker Chemie Ag

Platinum complexes and their use in compounds that can be cross-linked by a hydrosilylation reaction

Cyclopentadienyl platinum complexes bearing ethylenic unsaturation are efficient photocatalysts for hydrosilylation of compounds containing aliphatic carbon-carbon multiple bonds, while exhibiting extended dark time, and are particularly useful in addition-curable organopolysiloxane compositions.... Wacker Chemie Ag

Removal of oxygen from hydrocarbon-containing gas mixtures

The invention relates to a method for removing oxygen from hydrocarbon-containing gas mixtures, characterized in that a hydrocarbon-containing gas mixture containing 50 vol % of one or more hydrocarbons, 2 to 10 vol % of oxygen, and possibly one or more gases from the group comprising nitrogen, noble gases, hydrogen,... Wacker Chemie Ag

Oil-in-water silicone emulsion composition for die casting release agent

Organopolysiloxane emulsions having improved release properties when employed in die casting, contain an organopolysiloxane with long chain alkyl groups and/or aryl groups, and a partially hydrophobicized silica as an emulsifying agent.... Wacker Chemie Ag

Crosslinkable organopolysiloxane compositions

Moisture curable RTV-1 compositions with rapid curing and a modulus which is adjustable over a wide range include organopolysiloxanes having on-chain and side-chain silicon-bonded α-aminoalkyl groups and at least on average two silicon-bonded alkoxy groups, trialkoxyorganylsilanes and/or tetraalkoxysilanes, and organopolysiloxanes bearing alkoxysilyl groups.... Wacker Chemie Ag

Polymer master batch containing linear, ultra high molecular polydimethylsiloxanes devoid of vinyl groups

Polymer masterbatches useful for producing polymer compositions with improved abrasion resistance include a polypropylene homopolymer and a polydimethylsiloxane having a molecular weight >200,000 g/mol and being free of vinyl groups.... Wacker Chemie Ag

Processes for producing silicon

Silicon is produced by magnesiothermic reduction of silicon dioxide, wherein to achieve magnesiothermic reduction a reactant mixture is employed which contains silicon dioxide (SiO2) and magnesium (Mg) and, as moderators, magnesium oxide (MgO) and silicon (Si), and optionally further moderators.... Wacker Chemie Ag

Fluidized bed reactor for producing polycrystalline silicon granules and the assembly of such a fluidized bed reactor

Assembly of a fluidized bed reactor for the preparation of polycrystalline silicon granules by chemical vapor deposition of silicon onto seed particles and removal of polycrystalline silicon granules is facilitated without breakage and with gas tightness by a specific assembly sequence.... Wacker Chemie Ag

Production of isocyanate functional organosilanes

Isocyanate-functional silanes are prepared in high yield by pyrolysis of an O-carbamate prepared by reaction of a dialkylcarbonate with an aminoalkyl-functional silane in the presence of a basic catalyst, where the catalyst is neutralized by an acid which has a pKa of all protolysis stages of not more than 4.... Wacker Chemie Ag

Method for the hydrophobic impregnation of fired ceramic molded bodies

Fired clay moldings are hydrophobicized by applying a long chain alkyl-substituted alkoxysilane or hydrolysate thereof having up to 5 silicon atoms, and an alkoxy-functional silicone resin. The moldings, which may be roof tiles, are hydrophobicized to a significant depth, without discoloration.... Wacker Chemie Ag

Curable, highly transparent silicone composition with improved mechanics, for optical components

Cast silicone compositions with high transparency suitable for use as optical components contain a base polymer with a refractive index≧1.42, and a reinforcing particulate silica which is surface modified to have a refractive index within 0.03 of the refractive index of the base polymer, by reaction with an aryl-silane or... Wacker Chemie Ag

Water-redispersible polymer powders for carpet coating compositions

The use of redsipersible polymer powders containing no organic emulsifier for a binder in the production of carpeting is surprisingly superior to use of the same polymers in the form of an aqueous dispersion. Tuft removal force in particular, is improved. The compositions contain no thickener, or a reduced level... Wacker Chemie Ag

Fluidized bed reactor and process for producing polycrystalline silicon granules

Contamination of fluidized bed-produced polycrystalline granules by phosphorus is reduced by employing as seals and/or packings, graphite containing <500 ppmw of phosphorus.... Wacker Chemie Ag

Method for producing silicone elastomer parts

Silicon elastomer articles are prepared by a 3-D printing process by depositing droplets of high viscosity curable silicone onto a substrate layer by layer from independently spatially controllable nozzles and irradiation with independently spatially controllable electromagnetic energy.... Wacker Chemie Ag

Method for producing polycrystalline silicon

The rate of rod fallover in the production of polycrystalline silicon by the Siemens process is sharply reduced by cleaning the Siemens reactor base plate by at least a two-step procedure comprising suctioning the base plate in one step, and subsequently cleaning with liquid or solid cleaning medium in a... Wacker Chemie Ag

Method for the direct synthesis of methyl chlorosilanes in fluidized-bed reactors

Methylchlorosilanes are synthesized by an at least two stage reaction in which contact composition from a first fluidized bed reactor is fed to a second fluidized bed reactor.... Wacker Chemie Ag

Process for silane oligomer compostition preparation and use thereof

Epoxy silane oligomers are prepared from a glycidoxypropyl alkoxysilane in the presence of an alcohol and an esterification and/or transesterification catalyst, and have improved storage stability. The oligomers are particularly useful as scrub-resistant additives for aqueous architectural coatings.... Wacker Chemie Ag

Method for producing organofunctional silicone resins

Organofunctional organopolysiloxanes resins are prepared by reaction of a reactive silicone resin with a symmetrically substituted disiloxane in the presence of a heterogeneous activated silicate catalyst.... Wacker Chemie Ag

Device for insulating and sealing electrode holders in cvd reactors

Siemens CVD reactors are sealed in a manner which facilitates long production campaigns without refurbishing the seals, by the use of at least two seals, and an electrically insulating member having a thermal conductivity of from 1 to 200 W/mK, a sustained use temperature of at least 400° C., and... Wacker Chemie Ag

Purification of chlorosilanes by means of distillation and adsorption

Separation of chlorosilane mixtures containing boron, arsenic, and/or phosphorus impurities is facilitated by a distillative separation using at least one divided column, with recycle streams to a first column being passed through an external absorbent for the impurities.... Wacker Chemie Ag

Cutting apparatus

A cutting apparatus suitable for creating tunnels and subterranean roadways includes independently pivoting supports that each carry a respective independently pivoting arm and a rotatable cutting head. Each cutting head, via the supports and arms, is configured to slew laterally outward in a sideways direction and to pivot in a... Wacker Chemie Ag

Organopolysiloxane compositions which can be crosslinked by means of a condensation reaction

Moisture curable elastomer compositions are highly suitable for use as sealants, and initially contain an organopolysiloxane having condensable groups, a tri-acyloxy functional organosilicon compound, and as fillers, anhydrite and silica. The compositions have very low modulus and accommodate high joint movement, while being storage stable... Wacker Chemie Ag

Aqueous coating materials

Silicone resin dispersions containing at least one silicone resin having at least two differently substituted T units are used in aqueous coating materials producible therefrom for mineral building materials, wood or metal. The aqueous coating materials exhibit good hydrophobicity without beading, low water permeability, and acquire these properties rapidly after... Wacker Chemie Ag

09/14/17 / #20170260336

Cross-linkable masses based on organyl-oxysilane-terminated polymers

Moisture curable compositions having a low modulus and a high resilience are prepared by curing a composition containing a first polymer which predominately contains two moisture-curable silyl groups, and a second polymer which is terminated by an alkoxy group and contains but a single moisture-curable silyl group, or a hydroxyl... Wacker Chemie Ag

09/07/17 / #20170253759

Aqueous, polyvinyl alcohol stabilized vinyl acetate-ethylene-copolymer dispersion having high filler compatibility for carpet coating compositions

The invention relates to an aqueous vinyl acetate-ethylene-copolymer dispersion for carpet coating compositions, which is obtained by means of radical-initiated emulsion polymerization, in an aqueous medium, of vinyl acetate and ethylene and optionally additional ethylenically unsaturated comonomers, characterized in that, for stabilization of the dispersion, 5 to 10 wt %,... Wacker Chemie Ag

08/31/17 / #20170247515

Process for making an aminosiloxane polymer nanoemulsion

h) adding an aqueous carrier in an amount to produce a desired concentration of emulsion.... Wacker Chemie Ag

08/03/17 / #20170218136

Process for making an aminosiloxane polymer nanoemulsion

h) additionally adding an aqueous carrier in an amount to produce the desired concentration of emulsion.... Wacker Chemie Ag

07/27/17 / #20170208828

Fatty acid vinyl ester copolymers with wax qualities

Subject-matter of the invention are processes for preparing fatty acid vinyl ester copolymers by radically initiated polymerization of a) one or more vinyl esters of carboxylic acids having 16 to 22 carbon atoms and b) one or more vinyl esters of carboxylic acids having 2 to 15 carbon atoms, with... Wacker Chemie Ag

07/27/17 / #20170210856

Curable organopolysiloxane compositions

Artificial stone having excellent mechanical and weatherability properties is prepared from a highly filled crosslinkable organosilicon composition where the filler comprises at least 20 weight percent of coarse fillers, the organosilicon component contains silicon-bonded alkoxy and or hydroxyl groups, with a catalyst containing a metal compound and an amidine or... Wacker Chemie Ag

07/27/17 / #20170210957

Cross-linkable materials based on organyl-oxysilane-terminated polymers

A composition containing an alkoxysilyl-functional polymer, a phenylsilicone resin, and a non-reactive plasticizer, when cured, exhibits very high elongation without loss of tensile strength. The compositions are particularly well suited for flexible adhesives.... Wacker Chemie Ag

07/20/17 / #20170204520

Plastics material substrate having a silicon coating

Plastic material-comprising surfaces of a substrate are coated with elemental silicon by cold gas spraying by injecting a powder containing silicon into a gas and powder with a high velocity onto the substrate surface, such that the silicon forms a firmly adherent coat on the substrate surface comprising the plastics... Wacker Chemie Ag

07/13/17 / #20170198101

Cross-linkable masses based on organyloxysilane-terminated polymers

The objectionable odor of one component condensation curable organopolysiloxane compositions is eliminated by replacing all or the most substantial part of water scavenger vinyltrimethoxysilane with a phenyltrialkoxysilane, without compromising storage or curing properties.... Wacker Chemie Ag

06/22/17 / #20170174866

Process for producing organopolysiloxane compositions

Organopolysiloxane compositions are prepared with high throughput and less process time, by a process in which organopolysiloxanes, processing aids and fillers are mixed and kneaded in the presence of water to give raw mixtures and the raw mixtures are subsequently devolatilized and freed of water in a heating and devolatilizing... Wacker Chemie Ag

06/22/17 / #20170179478

Polymer composition as a binder system for lithium-ion batteries

The invention relates to an electrode coating for a lithium-ion battery, containing copolymer C or the salt thereof, copolymer C being synthesized by polymerizing a combined total of more than 70 wt % of vinyl-functional cyclic carbonate and one or more monomers from the group comprising acrylic acid and the... Wacker Chemie Ag

06/15/17 / #20170166511

Process for ruthenium-catalysed transvinylation of carboxylic acids

A process for selective transvinylation of a reactant carboxylic acid with a reactant vinyl ester to give a product vinyl ester and the corresponding acid of the reactant vinyl ester in the presence of one or more ruthenium catalysts, wherein a) the reactant vinyl ester, the reactant carboxylic acid and... Wacker Chemie Ag

06/15/17 / #20170166595

Method for producing siloxanes from alkali salts of silanols

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.... Wacker Chemie Ag

06/08/17 / #20170157807

Production of thin silicone films

Thin silicon films of high thickness uniformity and thicknesses of from 0.1 μm to 200 μm are prepared by applying a crosslinkable silicone composition to a moving carrier by means of a slot die, removing solvent, if present, and subsequently crosslinking the silicone layer formed on the carrier.... Wacker Chemie Ag

06/08/17 / #20170158516

Fluidized-bed reactor and process for preparing granular polycrystalline silicon

A fluidized-bed reactor for preparing granular polycrystalline silicon has a reactor vessel, a reactor tube and a reactor bottom within the reactor vessel, and an intermediate jacket located between the reactor tube and the reactor vessel, a heating device, at least one bottom gas nozzle for introducing of fluidizing gas... Wacker Chemie Ag

06/08/17 / #20170158600

Process for ruthenium-catalysed transvinylation of carboxylic acids

A process for selective transvinylation of a reactant carboxylic acid with a reactant vinyl ester to give a product vinyl ester and the corresponding acid of the reactant vinyl ester in the presence of one or more ruthenium catalysts, wherein a) the reactant vinyl ester, the reactant carboxylic acid and... Wacker Chemie Ag

06/08/17 / #20170159174

Reactor for producing polycrystalline silicon and removing a silicon-containing layer on a component of such a reactor

Silicon deposited by CVD and/or silico dust is removed from a polycrystalline silicon deposition reactor component by abrasion with silicon-containing particles in a gas stream.... Wacker Chemie Ag

06/01/17 / #20170152208

Method for providing an active ruthenium catalyst solution for the transvinylation of carboxylic acids

The invention relates to a method for providing a ruthenium catalyst solution which is active during the transvinylation of a surfactant vinyl ester with a surfactant carboxylic acid, comprising an Ru metal concentration of more than 0.5 wt. % based on the total weight of the ruthenium catalyst solution. The... Wacker Chemie Ag

06/01/17 / #20170152491

T7 expression system, its production and use thereof for producing recombinant proteins

The invention relates to an expression system comprising a prokaryotic cell which contains a polynucleotide construct that encodes a T7 RNA polymerase under the control of a T7 promoter and under the control of an inducible promoter. The invention also relates to an expression vector which contains a gene that... Wacker Chemie Ag

05/18/17 / #20170137445

Method for producing powders from alkali salts of silanols

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... Wacker Chemie Ag

05/18/17 / #20170137677

Compositions on the basis of organyloxysilane-terminated polymers

Moisture-curing adhesives simultaneously having high tensile strength and elongation are prepared by admixing a silane-terminated polyurethane or polyether polymer having a defined and limited molecular weight, finely divided silica, and an organosilicon compound containing basic nitrogen.... Wacker Chemie Ag

05/04/17 / #20170120210

Reactor and process for preparing granular polysilicon

A reactor for preparing granular polysilicon by deposition of polycrystalline silicon on silicon seed particles has a reaction vessel, an inner reactor tube for a fluidized bed comprising granular polysilicon and a reactor bottom within the reactor vessel, a heating device for heating the fluidized bed in the inner reactor... Wacker Chemie Ag

05/04/17 / #20170121535

Compositions of aminosiloxanes, alkoxysilicon compounds and metal carboxylates

Compositions containing an aminoalkyl-containing polydimethylsiloxane, a silicon compound containing silicon-bonded alkoxy groups, and a zirconium, titanium, or zinc carboxylate catalyst provides water repellency and stain resistance to substrates, particularly woven and non-woven textile and leather substrates.... Wacker Chemie Ag

04/27/17 / #20170113228

Silicon seed particles for the production of polycrystalline silicon granules in a fluidized bed reactor

Silicon seed particles which can be used for producing polycrystalline silicon granules in a fluidized-bed reactor are prepared by a process wherein a milling gas stream is introduced into a chamber containing polycrystalline silicon granules, as a result of which individual particles of the polycrystalline silicon granules are accelerated in... Wacker Chemie Ag

04/20/17 / #20170107394

Aqueous vinyl acetate ethylene copolymer dispersion for paper coating

The invention relates to a polymer dispersion for paper coating compositions obtainable by means of a radically initiated, aqueous emulsion polymerization of a) 60 to 97% by weight of vinyl acetate, b) 2 to 30% by weight of ethylene, c) 0.5 to 5% by weight of at least one ethylenically... Wacker Chemie Ag

04/13/17 / #20170101424

Process for hydrosilylation with addition of organic salts

Hydrosilylation of aliphatically unsaturated compounds (B) with compounds (A) bearing silicon-bonded hydrogen using a metal-containing hydrosilylation catalyst proceeds with higher yields and reduced quantities of byproducts when conducted in the presence of organic salts containing an inorganic or organic anion [Y]− and a heteroatom-containing cation [A]+ in amounts of 0.01... Wacker Chemie Ag

03/16/17 / #20170073472

Addition cross-linking silicone composition with a high water-absorption capacity

Reversibly water-absorbtive silicone rubbers are prepared from addition cross-likable organopolysiloxanes by means of a hydrosilylation catalyst, and initially contain anhydrous sodium sulfate, anhydrous magnesium sulfate, or a mixture thereof. The silicone rubbers are capable of absorbing large amounts of water.... Wacker Chemie Ag

03/16/17 / #20170073527

Hydrophobing agent for coatings

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.... Wacker Chemie Ag

03/02/17 / #20170057830

Process for producing polycrystalline silicon

Polycrystalline silicon chunks are packed for further processing and/or for shipment with minimal contamination by introducing the chunks into a cardboard container lined with a non-contaminating plastic. The process is economical, avoids the problems associated with packaging in plastic bags, and provides far less contamination and spillage during transport.... Wacker Chemie Ag

03/02/17 / #20170062827

Polymer compositions as a binder system for lithium-ion batteries

The invention relates to a polymer composition P containing: 100 parts-by-weight of polymer 1, which polymer is at least 50 g/l water-soluble at 25° C. and 1 bar, and can be produced via radical-initiated polymerisation of more than 95 wt. % of monomers from the group of acrylic acid, methylacrilic... Wacker Chemie Ag

Patent Packs
02/16/17 / #20170044370

Cross-linkable mixtures having alpha-functional polysiloxanes

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.... Wacker Chemie Ag

02/16/17 / #20170044410

Cross-linkable masses based on organyl-oxysilane-terminated polymers

RTV-1 compositions, despite containing conventional alkoxysilyl-terminated polymers, exhibit rapid cure and excellent physical properties when they further contain silicone resins, and employ metal, amidine, or guanidine curing catalysts C1 and amine-containing cocatalysts C2 in specific mole ratios.... Wacker Chemie Ag

02/09/17 / #20170036988

Process for ruthenium-catalyzed transvinylation of carboxylic acids

The invention relates to a process for transvinylation of a carboxylic acid feedstock with a vinyl ester feedstock to obtain a vinyl ester product and the corresponding acid of the vinyl ester feedstock in the presence of one or more ruthenium catalysts, wherein a) the vinyl ester feedstock, the carboxylic... Wacker Chemie Ag

02/09/17 / #20170037251

Surface-modified particulate metal oxides

Modified silica having a fraction of at least 15% T1 groups, or a greater fraction of T1 groups as compared to T3 groups, and an extractable content of less than 15 weight percent have a high proportion of surface modifying groups, and exhibit high thickening power in liquid media.... Wacker Chemie Ag

01/26/17 / #20170022141

Process for cleaning carbon dioxide-containing process gases from the preparation of vinyl acetate

The invention provides processes for cleaning carbon dioxide-containing process gases from the preparation of vinyl acetate after reaction of ethylene with acetic acid and oxygen in heterogeneously catalyzed, continuous gas phase processes, characterized in that carbon dioxide-containing process gases, for removal of carbon dioxide, are contacted with one or more... Wacker Chemie Ag

01/26/17 / #20170022320

Lactide polymerisation

The present invention relates to a compound having the formula LaM(OR1)bR2cXd wherein M is a metal selected from Ti, Zr and Hf; L is a ligand selected from permethylpentalene, (hydro)permethyl-pentalene, (hydro)pentalene, cyclopentadiene, indene and ethylene- or silane-bridged indene, preferably (bis)indene; R1 is a 1-6C alkyl, substituted or unsubstituted phenyl, or... Wacker Chemie Ag

01/12/17 / #20170008210

Method for producing silicone multi-layer composites

Multilayer silicone composites with precise thickness are produced by sequential extrusion of curable silicone films, and partially but not fully crosslinking a preceding silicone film prior to extruding a next subsequent film.... Wacker Chemie Ag

01/12/17 / #20170009020

Polysiloxanes comprising methylene-bonded polar groups

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.... Wacker Chemie Ag

01/05/17 / #20170001868

Method for producing polycrystalline silicon

Production of highly pure comminuted polycrystalline silicon from polycrystalline silicon rods produced by the Siemens process is facilitated by removal of graphite residues from the electrode ends of the rods by removing the contaminated end portions by means of mechanical impulses.... Wacker Chemie Ag

01/05/17 / #20170001869

Method for producing polycrystalline silicon

The native oxide layer on silicon support rods in the Siemens polysilicon production process is removed by heating the rods to a temperature of 1100-1200° C. and contacting the rods with hydrogen at a system pressure of 1.1E5 to 6E6 Pa. Oxide is rapidly removed, reducing overall process time and... Wacker Chemie Ag








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