32 results about "Polysilicon halides" patented technology

The invention is directed to a method of producing polycrystaline silicon metal from a silicon halide plasma source. The silicon halide is split into silicon and halide ions in an inductively coupled plasma and silicon ions are then condensed to form molten silicon metal that can be vacuum cast into polysilicon ingots. The halide ions are separated and recycled into silicon halide gas over a silicon dioxide bed. In this way, high grade polysilicon is produced without a metallurgical grade silicon precursor and the process these processes consumes the byproducts in a continuous manner madding it less expensive than traditional methods of producing polysilicon and more environmentally friendly.

The invention relates to a method for coating metallic effect pigments with silicon oxide, in which alkoxysilane(s) and/or silicon halide(s) in organic solvent are reacted with water in the presence of metallic effect pigments, where the reaction includes at least two steps, where (a) the reaction is carried out with addition of acid in a first step and with addition of base in a second step or where (b) the reaction is carried out with addition of base in a first step and with addition of acid in a second step. The invention further relates to the coated metallic effect pigments producible by way of the method of the invention, and also to the use thereof.

A method of preparing a trihalosilane comprising the separate and consecutive steps of (i) contacting a copper catalyst with hydrogen gas and a silicon tetrahalide at a temperature of from 500 to 1400° C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon, wherein the copper catalyst comprises a metal selected from copper and a mixture comprising copper and at least one element selected from gold, magnesium, and platinum; and (ii) contacting the silicon-containing copper catalyst with a hydrogen halide at a temperature of from 100 to 600° C. to form a trihalosilane.

A process and an apparatus for treating exhaust gases, comprising an aeration stirring tank (5) employing an aqueous alkaline liquid, and, as a posterior stage, a gas-liquid contact device (7) and/or a packed column (11). The apparatus can remove at the posterior stage harmful gases that the aeration stirring tank fails to remove, for example, water-soluble organic compounds such as ethanol, halogenated silicon compounds such as SiCl₄, and halogen gases such as F₂ and Cl₂. The process and apparatus are particularly suitable for purifying exhaust gases discharged from a semiconductor production device.

This invention discloses a process for synthesizing a dendrimer of a rubbery polymer comprising: (a) reacting a lithium terminated rubbery polymer with a halogenated silicon containing compound to produce a polymer which is terminated with halogenated silicon moieties, wherein the halogenated silicon contain compound has at least four halogen atoms which are bonded directly to silicon atoms, wherein the ratio of the lithium terminated rubbery polymer to halogen atoms in the halogenated silicon containing compound is within the range of 2:n to (n-1):n, wherein n represents the number of halogen atoms that are bonded directly to silicon atoms in the halogenated silicon containing compound, wherein the halogenated silicon containing compound contains at least three halogen atoms which are bonded directly to a silicon atom; (b) reacting the polymer which is terminated with halogenated silicon moieties with a molar excess of a tertiary alcohol to produce a polymer which is terminated with hydroxy silyl moieties; and (c) allowing the polymer which is terminated with the hydroxy silyl moieties to couple under conditions sufficient to produce a dendrimer containing siloxane linkages. It has also be found that similar dendrimers having improved processability can be make utilizing halogenated tin containing compounds in stead of the halogenated silicon containing compound.

A method of preparing a diorganodihalosilane comprising the separate and consecutive steps of (i) contacting a copper catalyst with a mixture comprising hydrogen gas and a silicon tetrahalide at a temperature of from 500 to 1400° C. to form a silicon-containing copper catalyst comprising at least 0.1% (w/w) of silicon, wherein the copper catalyst is selected from copper and a mixture comprising copper and at least one element selected from gold, magnesium, calcium, cesium, tin, and sulfur; and (ii) contacting the silicon-containing copper catalyst with an organohalide at a temperature of from 100 to 600° C. to form at least one diorganodihalosilane.

A method for preparing a reaction product including an aryl-functional silane includes sequential steps (1) and (2). Step (1) is contacting, under silicon deposition conditions, (A) an ingredient including (I) a halosilane such as silicon tetrahalide and optionally (II) hydrogen (H₂); and (B) a metal combination comprising copper (Cu) and at least one other metal, where the at least one other metal is selected from the group consisting of gold (Au), cobalt (Co), chromium (Cr), iron (Fe), magnesium (Mg), manganese (Mn), nickel (Ni), palladium (Pd), and silver (Ag); thereby forming a silicon alloy catalyst comprising Si, Cu and the at least one other metal. Step (2) is contacting the silicon alloy catalyst and (C) a reactant including an aryl halide under silicon etching conditions.

A method for removing metal impurities from silicon halide compounds such as chlorosilane monomers and/or chlorinated polysilanes is disclosed. The process involves treating a silicon halide compound with a tertiary amine and subsequently with a suitable grade of activated carbon.

A process for synthesizing a catalyst component for manufacturing ethylene polymer and co-polymer. The present invention provides a process for synthesizing catalyst component (A), comprising forming a complex by contacting the solid intermediate (B) with an aluminum compound represented by formula X_3-nAl(OY)_n, and alkyl metal (C), wherein X is halide, Y is a hydrocarbon group or chelating carbonyl group, and wherein 1 is less than or equal to n which is less than or equal to 3, and then contacting the complex with titanium halide having formula TiX₄ wherein X is halide. Solid intermediate (B) is formed by reacting magnesium metal with alkyl halide in the presence of alkoxy aluminum represented by formula Al(OR^a)₃, silicon halide represented by formula SiX₄ and alkoxy silane represented by formula Si(OR^b)₄, wherein R^a and R^b are an aromatic or aliphatic alkyl group and wherein X is halide. Alkyl metal (C) is synthesized by reacting alkyl aluminum compounds represented by formula AlR^c₃ with a secondary amine having formula HNR^d₂ and then by reacting with alkyl magnesium compounds represented by formula R^eMgR^f, wherein R^c, R^d, Re and R^f are an aromatic or aliphatic alkyl group. The catalyst component is suitable for producing ethylene polymer and co-polymer with narrow molecular weight distribution as well as improved branching compositional distribution.

Provided is a method for producing a silicon isocyanate compound-containing composition having a high purity of a monomer of a silicon isocyanate compound at an industrial grade and at low cost. A composition containing a silicon isocyanate compound is produced by reacting a silicon halide compound with a cyanate or isocyanate in the presence of a solvent and an alkanediol compound by a method comprising the following steps (A) to (D): (A) a step of mixing the cyanate or isocyanate, an azeotropic solvent, the alkanediol compound, and the solvent to produce a liquid; (B) a step of heating the liquid to remove water and the azeotropic solvent; (C) a step of adding the silicon halide compound to the liquid to generate the silicon isocyanate compound; and (D) a step of heating the liquid to distil and recover the silicon isocyanate compound.

The invention relates to a titanium family olefin polymerization catalyst additive, a catalyst comprising the titanium family olefin polymerization catalyst additive and the application of the catalyst. A preparing method comprises the steps that (1) magnesium halide is dissolved in an inert organic solvent and is in contact with alcoholic compounds, phenol compounds and a titanate mixture, and a magnesium compound solution is obtained; (2) silicon halide is in contact with the magnesium compound solution prepared in the step (1) to prepare spherical solid body particulate matter; and the spherical solid body particulate matter prepared in the step (2) is dispersed in the inert organic solvent, a titanium tetrachloride solution is added in a dripping mode, filtering, washing and drying are carried out, and the catalyst additive is obtained. The catalyst comprising the additive and a promoter is used for olefins, especially in vinyl polymerization. The olefin polymerization catalyst is good in particle morphology, high in polymerization activity and suitable for a slurry process or a vapor phase polymerization technology or a combination polymerization technology.