Patents by Inventor Alexander W. DeGroot
Alexander W. DeGroot has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10274465Abstract: The invention provides an apparatus for polymer chromatography, comprising at least one column that comprises a first stationary phase comprising one of the following: A) a material comprising at least one non-carbon atom, excluding glass or a metal, selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof, or B) glass, or a metal, or combinations thereof, and a material comprising at least one non-carbon atom selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof. The invention also provides a method for polymer chromatography, comprising introducing a solution, comprising a polymer, into a liquid flowing through a first stationary phase, and wherein the first stationary phase comprises one of foregoing materials (A) or (B).Type: GrantFiled: June 1, 2012Date of Patent: April 30, 2019Assignee: Dow Global Technologies LLCInventors: Rongjuan Cong, Charles M. Cheatham, Al Parrott, Wallace W. Yau, Lonnie G. Hazlitt, Zhe Zhou, Alexander W. Degroot, Matthew D. Miller
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Patent number: 9095792Abstract: The invention provides methods for chromatography of a polyolefin polymer, comprising introducing a solution of the polyolefin polymer into a liquid flowing through a liquid chromatography stationary phase, the liquid chromatography stationary phase comprising graphitic carbon. The invention also provides an apparatus for polyolefin polymer chromatography, comprising a liquid chromatography stationary phase, the liquid chromatography stationary phase comprising graphitic carbon and at least one inert filler.Type: GrantFiled: December 21, 2010Date of Patent: August 4, 2015Assignee: Dow Global Technologies LLCInventors: William L. Winniford, Rongjuan Cong, Theodore M. Stokich, Jr., Randy J. Pell, Matthew D. Miller, Abhishek Roy, Freddy Van Damme, Alexander W. Degroot, John W. Lyons, David M. Meunier
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Publication number: 20140090453Abstract: The invention provides an apparatus for polymer chromatography, comprising at least one column that comprises a first stationary phase comprising one of the following: A) a material comprising at least one non-carbon atom, excluding glass or a metal, selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof, or B) glass, or a metal, or combinations thereof, and a material comprising at least one non-carbon atom selected from molybdenum sulfide MoS2, tungsten sulfide WS2, silicon carbide SiC, boron nitride BN, or combinations thereof. The invention also provides a method for polymer chromatography, comprising introducing a solution, comprising a polymer, into a liquid flowing through a first stationary phase, and wherein the first stationary phase comprises one of foregoing materials (A) or (B).Type: ApplicationFiled: June 1, 2012Publication date: April 3, 2014Applicant: DOW GLOBAL TECHNOLOGIES LLCInventors: Rongjuan Cong, Charles M. Cheatham, Al Parrott, Wallace W. Yau, Lonnie G. Hazlitt, Zhe Zhou, Alexander W. Degroot, Matthew D. Miller
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Patent number: 8323569Abstract: Apparatus for GPC/TREF and TREF/GPC characterization of a polymer sample. The apparatus provides for the automated and integrated use of multiple TREF columns and a GPC system employing a multiple flow through detectors. In addition, a method for TREF/GPC characterization of a polymer sample by GPC analysis of TREF fractions at increasing TREF elution temperatures from multiple TREF columns operated in a coordinated and synchronized temperature cycle for increased sample throughput. Also, a method for GPC/TREF characterization of a polymer sample by GPC fractionation followed by TREF fractionation of the GPC fractionations.Type: GrantFiled: June 15, 2011Date of Patent: December 4, 2012Assignee: Dow Global Technologies LLCInventors: David T. Gillespie, Colin Lipishan, Lonnie G. Hazlitt, Alexander W. Degroot, Peter B. Arnoudse, Charles A. Williams
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Patent number: 8318896Abstract: A method for multi-dimensional chromatography of a polyolefin polymer, comprising introducing a solution of the polyolefin polymer into a liquid flowing through a first liquid chromatography stationary phase or a field flow fractionation device and subsequently flowing the solution through a second liquid chromatography stationary phase, the second liquid chromatography stationary phase comprising graphitic carbon, the polyolefin polymer emerging from the liquid chromatography stationary phase with a retention factor greater than zero.Type: GrantFiled: December 21, 2009Date of Patent: November 27, 2012Assignee: Dow Global Technologies LLCInventors: William L. Winniford, Rongjuan Cong, Theodore M. Stokich, Jr., Randy J. Pell, Matthew D. Miller, Abhishek Roy, Freddy Van Damme, Alexander W. Degroot, John W. Lyons, David M. Meunier
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Publication number: 20120227469Abstract: The invention provides a method for one-dimensional chromatography of a polyolefin polymer, comprising introducing a solution of the polyolefin polymer into a liquid flowing through a liquid chromatography stationary phase, the liquid chromatography stationary phase comprising graphitic carbon, and wherein the polyolefin polymer emerging from the liquid chromatography stationary phase has a retention factor greater than zero, and wherein the solution introduced into the liquid chromatography stationary phase is subjected to a temperature gradient, and/or the solution is subjected to a solvent gradient.Type: ApplicationFiled: December 21, 2010Publication date: September 13, 2012Applicant: Dow Global Technologies LLCInventors: William L. Winniford, Rongjuan Cong, Theodore M. Stokich, JR., Randy J. Pell, Matthew D. Miller, Abhishek Roy, Freddy Van Damme, Alexander W. Degroot, John W. Lyons, David M. Meunier
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Patent number: 8076147Abstract: A method and apparatus for chromatography of a polyolefin polymer by flowing a solution of the polyolefin polymer through liquid flowing through a graphitic carbon liquid chromatography stationary phase. The method can be used to determine the monomer to comonomer ratio of a polyolefin copolymer such as a copolymer of ethylene and 1-octene or a copolymer of propylene and ethylene.Type: GrantFiled: October 2, 2009Date of Patent: December 13, 2011Assignee: Dow Global Technologies LLCInventors: Freddy Van Damme, John W. Lyons, William L. Winniford, Alexander W. Degroot, Matthew D. Miller
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Publication number: 20110239746Abstract: Apparatus for GPC/TREF and TREF/GPC characterization of a polymer sample. The apparatus provides for the automated and integrated use of multiple TREF columns and a GPC system employing a multiple flow through detectors. In addition, a method for TREF/GPC characterization of a polymer sample by GPC analysis of TREF fractions at increasing TREF elution temperatures from multiple TREF columns operated in a coordinated and synchronized temperature cycle for increased sample throughput. Also, a method for GPC/TREF characterization of a polymer sample by GPC fractionation followed by TREF fractionation of the GPC fractionations.Type: ApplicationFiled: June 15, 2011Publication date: October 6, 2011Applicant: Dow Global Technologies LLCInventors: David T. Gillespie, Colin Li Pi Shan, Lonnie G. Hazlitt, Alexander W. Degroot, Peter B. Arnoudse, Charles Allen Williams
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Patent number: 7999039Abstract: A process of making a polymer is described. The process includes contacting one or more olefinic monomers in the presence of at least a high molecular weight (HMW) catalyst and at least a low molecular weight (LMW) catalyst in a polymerization reactor system; and effectuating the polymerization of the one or more olefinic monomers in the polymerization reactor system to obtain an olefin polymer, wherein the LMW catalyst has an RvL, defined as R v L = [ vinyl ] [ vinyl ] + [ vinylidene ] + [ cis ] + [ trans ] wherein [vinyl] is the concentration of vinyl groups in the olefin polymer produced by the low molecular weight catalyst expressed in vinyls/1,000 carbon atoms; [vinylidene], [cis] and [trans] are the concentration of vinylidene, cis and trans groups in the olefin polymer expressed in the number of the respective groups per 1,000 carbon atoms, of greater than 0.12, and wherein the HMW catalyst has a reactivity ratio, r1 of about 5 or less.Type: GrantFiled: August 16, 2004Date of Patent: August 16, 2011Assignee: Dow Global Technologies LLCInventors: Alexander W. DeGroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund Carnahan, David Gillespie, Daniel D. VanderLende
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Patent number: 7985593Abstract: Apparatus for GPC/TREF and TREF/GPC characterization of a polymer sample. The apparatus provides for the automated and integrated use of multiple TREF columns and a GPC system employing a multiple flow through detectors. In addition, a method for TREF/GPC characterization of a polymer sample by GPC analysis of TREF fractions at increasing TREF elution temperatures from multiple TREF columns operated in a coordinated and synchronized temperature cycle for increased sample throughput. Also, a method for GPC/TREF characterization of a polymer sample by GPC fractionation followed by TREF fractionation of the GPC fractionations.Type: GrantFiled: January 19, 2006Date of Patent: July 26, 2011Assignee: Dow Global Technologies LLCInventors: David T. Gillespie, Colin Li Pi Shan, Lonnie G. Hazlitt, Alexander W. DeGroot, Peter B. Arnoudse, Charles Allen Williams
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Publication number: 20110152499Abstract: A method for multi-dimensional chromatography of a polyolefin polymer, comprising introducing a solution of the polyolefin polymer into a liquid flowing through a first liquid chromatography stationary phase or a field flow fractionation device and subsequently flowing the solution through a second liquid chromatography stationary phase, the second liquid chromatography stationary phase comprising graphitic carbon, the polyolefin polymer emerging from the liquid chromatography stationary phase with a retention factor greater than zero.Type: ApplicationFiled: December 21, 2009Publication date: June 23, 2011Applicant: Dow Global Technologies Inc.Inventors: William L. Winniford, Rongjuan Cong, Theodore M. Stokich, JR., Randy J. Pell, Matthew D. Miller, Abhishek Roy, Freddy Van Damme, Alexander W. Degroot, John W. Lyons, David M. Meunier
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Publication number: 20080166817Abstract: Apparatus for GPC/TREF and TREF/GPC characterization of a polymer sample. The apparatus provides for the automated and integrated use of multiple TREF columns and a GPC system employing a multiple flow through detectors. In addition, a method for TREF/GPC characterization of a polymer sample by GPC analysis of TREF fractions at increasing TREF elution temperatures from multiple TREF columns operated in a coordinated and synchronized temperature cycle for increased sample throughput. Also, a method for GPC/TREF characterization of a polymer sample by GPC fractionation followed by TREF fractionation of the GPC fractionations.Type: ApplicationFiled: January 19, 2006Publication date: July 10, 2008Inventors: David T. Gillespie, Colin Li Pi Shan, Lonnie G. Hazlitt, Alexander W. Degroot, Peter B. Arnoudse, Charles Allen Williams
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Patent number: 7300983Abstract: A polymer composition that has a backbone chain; and a plurality of long chain branches connected to the backbone is described. The polymer composition also has a value of 2g?LCB-1g?LCB that is less than about 0.22, where 1g?LCB is the long chain branching index for a fraction of the composition having a Mw of 100,000 and 2g?LCB is the long chain branching index for a fraction of the composition having a Mw of 500,000.Type: GrantFiled: August 17, 2004Date of Patent: November 27, 2007Assignee: Dow Global Technologies Inc.Inventors: Alexander W. Degroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund M. Carnahan, David Gillespie, Daniel D. Vanderlende
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Patent number: 6875816Abstract: A polymer composition comprises: (a) a high molecular weight, branched component; and (b) a low molecular weight, branched component. Some polymer compositions are characterized by a substantial absent of amyl or methyl branches and a melt strength (MS) that satisfies the following relationship: MS ? x I 2 + y where x is greater than or equal to about 12.5 and y is greater than or equal to about 3. Some polymers are characterized by a melt strength (MS) that satisfies the following relationship: MS ? x I 2 + y where x is greater than or equal to about 3 and y is greater than or equal to about 4.5 and a molecular weight distribution of greater than 3. A process for making polymers is also disclosed.Type: GrantFiled: March 15, 2002Date of Patent: April 5, 2005Assignee: Dow Global Technologies Inc.Inventors: Alexander W. DeGroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund Carnahan, David Gillespie, Daniel D. VanderLende
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Publication number: 20030065097Abstract: A polymer composition comprises: (a) a high molecular weight, branched component; and (b) a low molecular weight, branched component.Type: ApplicationFiled: March 15, 2002Publication date: April 3, 2003Applicant: The Dow Chemical CompanyInventors: Alexander W. DeGroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund Carnahan, David Gillespie, Daniel D. VanderLende
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Patent number: RE42276Abstract: A polymer composition comprises: (a) a high molecular weight, branched component; and (b) a low molecular weight, branched component. Some polymer compositions are characterized by a substantial absent of amyl or methyl branches and a melt strength (MS) that satisfies the following relationship: MS ? x I 2 + y where x is greater than or equal to about 12.5 and y is greater than or equal to about 3. Some polymers are characterized by a melt strength (MS) that satisfies the following relationship: MS ? x I 2 + y where x is greater than or equal to about 3 and y is greater than or equal to about 4.5 and a molecular weight distribution of greater than 3. A process for making polymers is also disclosed.Type: GrantFiled: October 23, 2009Date of Patent: April 5, 2011Assignee: Dow Global Technologies LLCInventors: Alexander W. DeGroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund Carnahan, David Gillespie, Daniel D. VanderLende
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Patent number: RE43004Abstract: A polymer composition that has a backbone chain; and a plurality of long chain branches connected to the backbone is described. The polymer composition also has a value of 2g?LCB-1g?LCB g?2LCB-g?1LCB that is less than about 0.22, where 1g?LCB g?2LCB is the long chain branching index for a fraction of the composition having a Mw of 100,000 and 2g?LCB g?1LCB is the long chain branching index for a fraction of the composition having a Mw of 500,000.Type: GrantFiled: October 23, 2009Date of Patent: December 6, 2011Assignee: Dow Global Technologies LLCInventors: Alexander W. DeGroot, James C. Stevens, Sylvie Y. Desjardins, Jeffrey Weinhold, Edmund Carnahan, David Gillespie, Daniel D. VanderLende