Burghausen, Germany
Burghausen, Germany

Wacker Chemie AG is a worldwide operating company in the chemical business, founded 1914. The company is controlled by the Wacker-family holding more than 50 percent of the shares. The corporation is operating more than 25 production sites in Europe, Asia, and the Americas. The product range includes silicone rubbers, polymer products like ethylene vinyl acetate redispersible polymer powder, chemical materials, polysilicon and wafers for semiconductor industry. The company sells its products in more than 100 countries. As of 31 December 2010 16,314 employees have been with Wacker. Corporate annual sales in 2010 were about 4,75 billion Euros, up 28% compared to 2009.The biggest production site of Wacker Chemie is the Burghausen plant in the south-east of Bavaria, Germany, with about 10,000 employees. The US headquarters are located at Adrian, Michigan. Wikipedia.


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The object of the invention is a process for the production of silicon seed particles which can be used for the production of polycrystalline silicon granules in a fluidized bed reactor, comprising the introduction of a grinding gas stream into a chamber (5) with polycrystalline silicon granules, whereby individual particles of the polycrystalline silicon granules are accelerated in such a manner that they collide with other particles of the polycrystalline silicon granules, thereby comminuting the polycrystalline silicon granules. The invention is characterized in that the grinding gas stream is introduced into the chamber by at least one jet nozzle (4) made of hard metal.


The invention relates to cross-linkable masses containing A) 100 parts by weight of compounds of formula (I): Y-[(CR1 2)3-SiRa(OR2)3-a]b; B) at least 5 parts by weight of silicon resins containing units of formula (II): R3 c(R4O)dR5 eSiO(4-c-d-e)/2; C1) catalysts selected from metal-containing curing catalysts, guanidines and amidines, and C2) co-catalysts containing units of formula (III): DhSi(OR7)gR6 fO(4-f-g-h)/2, the groups and indices being defined as cited in claim 1. The invention also relates to methods for producing said polymers and to their use as adhesives and sealants, in particular for bonding substrates.


The invention relates to a method for separating a mixture containing at least one carboxylic acid vinyl ester of general formula R-C(O)O-CH=CH2 and at least one carboxylic acid of general formula R-COOH, wherein R in either case can be an aliphatic group having 12 to 22 C atoms or a cycloaliphatic group having 12 to 22 C atoms, or an aromatic group having 12 to 22 C atoms, and R can be identical or different, characterized in that the carboxylic acid is converted to its anhydride R-C(O)-O-C(O)-R and the carboxylic acid vinyl ester is subsequently separated.


Patent
Wacker Chemie AG | Date: 2017-01-27

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.


Patent
Wacker Chemie AG | Date: 2017-01-25

The invention relates to a method for producing powder (P) from salts of silanols, from the hydrolysis/condensation products thereof, or from silanols together with the hydrolysis/condensation products thereof and cations which are selected from alkali cations, the molar ratio of cation to silicon being 0.1 to 3. In a first step organoalkoxysilanes, the hydrolysis/condensation products thereof, or organoalkoxysilanes together with the hydrolysis/condensation products thereof, the alkoxy group being selected from methoxy, ethoxy, 1-propoxy and 2-propoxy groups, are reacted with a basic alkali salt and optionally water to produce a hydrolysate having an alcohol content from 2 to 38 percent by weight. In a second step a powder having an alcohol content of 0.5 to 5 percent by weight is produced by drying from the hydrolysate produced in the first step, and in a third step the alcohol content is reduced by an aftertreatment of the powder, the powder (P) being obtained with an alcohol content of at most 1 percent by weight. The invention further relates to a powder (P) which can be produced by the above method, the hydrolysate produced in the first step being spray-dried in the second step. The invention further relates to mixtures of construction materials containing the powder (P) which can be produced in this way, and to structural parts or to moulded bodies, which can be produced from the mixtures of construction materials.


The invention relates to compositions (Z), which contain: (i) 100 parts by weight of polydimethylsiloxanes (P) comprising aminoalkyl groups having an amine number of at least 0.1 mequiv/g of polydimethylsiloxane (P), composed of units of the general formula (I): R1 aR2 bSiO(4-a-b/2), wherein R1, R2, a and b have the meanings specified in claim 1, (ii) 1 to 80 parts by weight of a silicon compound (S) comprising alkoxy groups bound to silicon, and (iii) 0.5 to 10 parts by weight of a metal-C1-C4-carboxylate, wherein the metal is selected from Zr(IV), Ti(IV) and Zn(II); and the use of same for the treatment of porous or non-porous, absorbent or non-absorbent substrates.


The invention relates to an addition cross-linking silicone composition containing: (A) at least one polyorganosiloxane having at least two alkenyl groups per molecule and a viscosity of between 0.2 and 1000 Pas at 25C; (B) at least one SiH-functional cross-linking agent; (C) at least one hydrosilylation catalyst; (D) at least one hydratable salt; and (E) at least one filler.


Patent
Wacker Chemie AG | Date: 2017-05-24

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 one or more vinyl esters a) and one or more vinyl esters b) being metered in during the polymerization, characterized in that during the polymerization either the metering rate of vinyl ester a) or the metering rate of vinyl ester b) is reduced and the metering rate of the other of the two vinyl esters, a) or b), is increased.


Patent
Wacker Chemie AG | Date: 2017-01-25

The invention relates to a reactor for preparing granular polysilicon by deposition of polycrystalline silicon on silicon seed particles, comprising 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 tube, at least one bottom gas nozzle for introduction of fluidizing gas and at least one reaction gas nozzle for introduction of reaction gas, a feed device to introduce silicon seed particles and also an offtake line for granular polysilicon and a device for discharging reactor offgas from the reactor vessel, characterized in that a cylindrical component which has openings on its cylindrical surface, with at least 5% and not more than 95% of the cylindrical surface being open, is located between inner reactor tube and heating device.


Patent
Wacker Chemie AG | Date: 2017-02-15

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 acid feedstock and a ruthenium catalyst are fed to the reactor, and b) the transvinylation reaction is carried out, characterized in that a carbonyl-free Ru(III) carboxylate is used as the ruthenium catalyst and in that no carbon monoxide is supplied, c) the reaction is carried out at a temperature of 110 to 170 C, d) upon completion of the transvinylation reaction, the vinyl ester feedstock and the corresponding acid are separated from the reaction mixture by distillation, e) the vinyl ester product is separated by distillation from the bottom product of the distillation, and f) the remaining reaction mixture is recycled into the reactor.

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