Patents Represented by Attorney Shao-Hua Guo
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Patent number: 7527175Abstract: To meter catalysts into a reactor, the catalyst is firstly suspended in a hydrocarbon in a reservoir and the suspension obtained is kept in motion by stirring and then fed via a three-way metering valve and an ejector into the actual reactor, wherein the suspension containing the catalyst is firstly discharged from the reservoir by means of a pump and continuously circulated by returning the suspension via the three-way metering valve within a closed piping system to the reservoir, subsequently setting a pressure in the reservoir which is from 0.1 to 30 bar higher than the pressure in the reactor and then continuously introducing the suspension into the reactor via a flow meter which controls the three-way metering valve and via a downstream ejector by pulse operation of the now open three-way metering valve.Type: GrantFiled: January 30, 2002Date of Patent: May 5, 2009Assignee: Basell Polyolefine GmbHInventors: Hermann Gebhart, Volker Dolle, Elisabeth Glattki-Mayer, legal representative, Angel Sanchez, Herbert Plötz, Peter Götz, Franz Langhauser, Klaus-Peter Mayer
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Patent number: 7524988Abstract: A method for removing aldehyde impurities from an acetic acid stream is disclosed. The method comprises reacting an acetic acid stream containing aldehyde impurities with a hydroxyl compound to form corresponding acetals. The acetals are subsequently removed from the acetic acid by, e.g., distillation.Type: GrantFiled: August 1, 2006Date of Patent: April 28, 2009Assignees: Lyondell Chemical Technology, L.P., Millennium Petrochemicals Inc.Inventors: Stephen H. Harris, Brian A. Salisbury, Ronnie M. Hanes
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Patent number: 7517938Abstract: Process for polymerizing at least one olefinic monomer selected from ethylene, propylene and 1-butene in a loop reactor in the presence of a polymerization catalyst at from 20 to 150° C., but below the melting point of a polymer to be formed, and a pressure of from 43 to 80 bar, where the polymer formed is present in a suspension in a liquid or supercritical suspension medium and wherein the suspension is circulated by means of an axial pump, wherein the polymerization is carried out at an average solids concentration in the reactor of more than 53% by weight, in the case of continuous product discharge, and at an average solids concentration in the reactor of more than 45% by weight, in the case of discontinuous product discharge, and wherein the polymerization is carried out at an ethylene concentration of at least 10 mol %, based on the suspension medium.Type: GrantFiled: September 16, 2004Date of Patent: April 14, 2009Assignee: Basell Polyolefine GmbHInventors: Shahram Mihan, Wolfgang Gsella, Peter Kölle, Joachim Wulff-Döring, Markus Meierhöfer
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Patent number: 7485749Abstract: A method for removing aldehyde impurities from an acetic acid stream is disclosed. The method comprises reacting aldehyde impurities with a hydroxyl compound in a drying distillation column or a combined column to form corresponding acetals. The acetals are subsequently removed as heavy impurities from acetic acid by distillation.Type: GrantFiled: August 22, 2006Date of Patent: February 3, 2009Assignees: Lyondell Chemical Technology, L.P., Millennium Petrochemicals inc.Inventors: Gary A. Sawyer, Wayne J. Brtko, Ronnie M. Hanes, Brian A. Salisbury
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Patent number: 7473745Abstract: Disclosed is a polyethylene composition. The composition comprises single-site multimodal resin A and single-site multimodal resin B, wherein resin A differs from resin B in molecular weight, in monomeric composition, in density, in long chain branch concentration or distribution, or in combinations thereof. Disclosed is also a method for making the polyethylene composition. The method comprises polymerizing, in the presence of two or more single-site catalysts, ethylene or its mixture with a C3-C10 ?-olefin to form a first multimodal resin and continuing the polymerization in the presence of the same catalysts but in a different hydrogen concentration, in a different monomer composition, or at a different temperature to form a second multimodal resin.Type: GrantFiled: September 2, 2005Date of Patent: January 6, 2009Assignee: Equistar Chemicals, LPInventors: Venki Chandrashekar, Mark P. Mack, Charles H. Gates, Jr., Charles S. Holland, Natalia Nagy, Sandor M. Nagy, Edward S. Vargas, Jean A. Merrick-Mack
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Patent number: 7473746Abstract: A process for polymerizing unsaturated monomers is disclosed. The process comprises polymerizing, in the presence of a late transition metal catalyst (LTMC), a variety of unsaturated monomers which are traditionally, some of which are exclusively, made by free radical polymerizations. The LTMC polymerization provides the polymer with improved properties such as no free radical residue and narrow molecular weight distribution.Type: GrantFiled: February 24, 2005Date of Patent: January 6, 2009Assignee: Equistar Chemicals, LPInventors: Jia-Chu Liu, Shao-Hua Guo
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Patent number: 7429635Abstract: Disclosed is a method of preparing an ultra-high molecular weight, linear low density polyethylene with a catalyst system that comprises a bridged indenoindolyl transition metal complex, a non-bridged indenoindolyl transition metal complex, an alumoxane activator and a boron-containing activator. The ultra-high molecular weight, linear low density polyethylene has a weight average molecular weight greater than 1,000,000 and a density less than 0.940 g/cm3.Type: GrantFiled: September 28, 2006Date of Patent: September 30, 2008Assignee: Equistar Chemicals, LPInventor: Shaotian Wang
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Patent number: 7425652Abstract: Alkanolamine compositions are disclosed. The composition comprises an alkanolamine and hydroxylamine or hydrazine. Preferred alkanolamine includes diethanolamine, triethanolamine, and mixtures thereof. The composition of the invention has significantly reduced discoloration.Type: GrantFiled: July 27, 2005Date of Patent: September 16, 2008Assignee: Lyondell Chemical Technology, L.P.Inventors: Wei Wang, Farhad Fadakar
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Patent number: 7399809Abstract: A method of modifying a polyethylene is disclosed. In the method ethylene or a mixture of ethylene and a C3-C10 ?-olefin is polymerized in an organic solvent with a Ziegler or single-site catalyst to form an initial polyethylene solution. The initial polyethylene solution is then reacted with a free radical initiator to produce a modified polyethylene. The modified polymer has an enhanced melt elasticity and increased long chain branching index, and is essentially free of gel.Type: GrantFiled: January 11, 2007Date of Patent: July 15, 2008Assignee: Equistar Chemicals, LPInventors: Andrew J. Scheie, Mark K. Reinking
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Patent number: 7393424Abstract: A gypsum composition comprising water, stucco, clay, an amine compound, a polyoxyalkylene, and a comb-branched copolymer is disclosed. The gypsum composition has improved fluidity. A method for preparing the gypsum composition is also disclosed. The method comprises mixing the components to form a slurry, casting the slurry into a product, and drying the product.Type: GrantFiled: May 16, 2007Date of Patent: July 1, 2008Assignee: Lyondell Chemical Technology, L.P.Inventors: Steven A. Schwartz, Sallie J. Lee, Frank J. Liotta, Jr., Robert M. Arrell
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Patent number: 7390919Abstract: Disclosed is a method for removing aldehyde impurities from a methyl acetate supply. The method comprises reacting the methyl acetate supply with a polyol and converting the aldehyde impurities to cyclic acetals. The acetals are subsequently removed from the methyl acetate supply by, e.g., distillation. The purified methyl acetate supply is used for carbonylation to produce acetic acid.Type: GrantFiled: October 1, 2007Date of Patent: June 24, 2008Assignee: Lyondell Chemical Technology, L.P.Inventors: Brian A. Salisbury, Ronnie M. Hanes, Noel C. Hallinan
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Patent number: 7345197Abstract: A method for removing aldehyde impurities from acetic acid is disclosed. The method comprises extracting the aldehyde impurities from a methyl iodide solution such as the decanter heavy phase with a polyol. After the aldehyde impurities are removed, the methyl iodide heavy phase can be recycled to the carbonylation.Type: GrantFiled: June 5, 2007Date of Patent: March 18, 2008Assignee: Lyondell Chemical Technology, L.P.Inventors: Noel C. Hallinan, Brian A. Salisbury
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Patent number: 7261772Abstract: A gypsum composition comprising water, stucco, clay, an amine compound, a polyoxyalkylene, and a comb-branched copolymer is disclosed. The gypsum composition has improved fluidity. A method for preparing the gypsum composition is also disclosed. The method comprises mixing the components to form a slurry, casting the slurry into a product, and drying the product.Type: GrantFiled: October 17, 2006Date of Patent: August 28, 2007Assignee: Lyondell Chemical Technology, L.P.Inventors: Steven A. Schwartz, Sallie J. Lee, Frank J. Liotta, Jr., Robert M. Arrell
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Patent number: 7232875Abstract: A comb-branched polymer is disclosed. The polymer comprises recurring units of an unsaturated carboxylic monomer, an oxypropylene-rich poly(oxyethylene-oxypropylene) macromonomer and an oxyethylene-rich poly(oxyethylene-oxypropylene) macromonomer. The comb-branched polymer can be used as a water reducing agent in cement. It gives significantly lower air entrainment in cement admixture.Type: GrantFiled: May 9, 2006Date of Patent: June 19, 2007Assignee: Lyondell Chemical Technology, L.P.Inventors: Frank J. Liotta, Jr., Edward T. Shawl
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Patent number: 7208625Abstract: A method for removing permanganate-reducing impurities from an acetic acid product is disclosed. The method comprises contacting an acetic acid product containing permanganate-reducing impurities with peracetic acid and an oxygen-containing gas. The method is particularly suitable for post treatment of acetic acid that contains permanganate-reducing impurities such as crotonaldehyde.Type: GrantFiled: August 4, 2006Date of Patent: April 24, 2007Assignee: Lyondell Chemical Technology, L.P.Inventors: Wei Wang, Shao-Hua Guo
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Patent number: 7183348Abstract: A method for modifying polyolefin-clay nanocomposites is disclosed. The method comprises shearing a melt of solution-prepared nanocomposites at an effective shear rate. The modified nanocomposite shows significantly decreased complex melt viscosity, storage modulus, and loss modulus.Type: GrantFiled: January 13, 2005Date of Patent: February 27, 2007Assignee: Equistar Chemicals, LPInventors: Mark K. Reinking, Karl P. Rufener
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Patent number: 7125939Abstract: Disclosed is a process for polymerizing olefins. The process comprises polymerizing one or more olefins with a single-site catalyst in two or more polymerization stages. The catalyst comprises a transition metal complex, an activator, and a hydroxyl functional polymer. The complex, the activator, or both are chemically bound to the hydroxyl functional polymer.Type: GrantFiled: August 30, 2004Date of Patent: October 24, 2006Assignee: Equistar Chemicals, LPInventors: Shaotian Wang, Shao-Hua Guo
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Patent number: 7091272Abstract: An olefin polymerization process is disclosed. The polymerization is performed in the presence of a clay, an activator, and a transition metal complex that has at least one pyridine moiety-containing ligand. The presence of clay increases the catalyst activity. The process is suitable for making ultra-high molecular weight polyethylenes (UHMWPE). The UHMWPE produced has increased bulk density.Type: GrantFiled: May 27, 2004Date of Patent: August 15, 2006Assignee: Equistar Chemicals, LPInventor: Jia-Chu Liu
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Patent number: 7084221Abstract: A modified aluminoxane is disclosed. Aluminoxane compounds are modified with glycol ethers or polyethers. The modified aluminoxanes are effective activators for single-site catalysts. Catalyst activated with the modified aluminoxane produces polyolefin with increased melt flow index, broadened molecular weight distribution, and improved thermal processability.Type: GrantFiled: September 16, 2004Date of Patent: August 1, 2006Assignee: Equistar Chemicals, LPInventors: Shao-Hua Guo, Shaotian Wang
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Patent number: 7078081Abstract: An essentially transparent, high density polyethylene film is disclosed. The film has a haze of 20% or less, a gloss of 40% or greater, and density within the range of 0.935 to 0.948 g/cc. The film is made by a high-stalk blown extrusion process and then uniaxially oriented in the machine direction.Type: GrantFiled: April 28, 2005Date of Patent: July 18, 2006Assignee: Equistar Chemicals, LPInventor: D. Ryan Breese