Patents by Inventor Leming Gu
Leming Gu 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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Publication number: 20220371253Abstract: A system for halogenating olefinic-based elastomer, the system comprising a first extruder, a first kneader vessel downstream of said first extruder and in fluid communication with said first extruder, a second extruder downstream of said first kneader vessel and in fluid communication with said first kneader vessel, a second kneader vessel downstream of said second extruder and in fluid communication with said second extruder; and a third extruder downstream of said second kneader vessel and in fluid communication with said second kneader vessel.Type: ApplicationFiled: August 12, 2021Publication date: November 24, 2022Inventors: Richard D. Hembree, Michael F. McDonald, JR., Joseph A. Maier, Leming Gu, Yu Feng Wang
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Patent number: 10947375Abstract: A system for producing a functionalized olefinic-based polymer, the system comprising a polymerization zone for producing an olefinic-based polymer comprising a mixing section, a deliquifying section, and a quenching section, wherein at least one section of the polymerization zone has a defined cross-sectional area that continually decreases from a first end to a second end of said section; a devolatilization zone comprising a kneader or extruder, wherein said devolatilization zone is downstream of said polymerization zone and in fluid communication with said polymerization zone; and a functionalization zone downstream of said devolatilization zone and in fluid communication with said devolatilization zone.Type: GrantFiled: December 9, 2016Date of Patent: March 16, 2021Assignee: ExxonMobil Chemical Patents Inc.Inventors: Yu Feng Wang, Richard D. Hembree, Michael F. McDonald, Jr., Joseph A. Maier, Richard C. M. Yeh, Leming Gu, Timothy D. Shaffer, Pamela J. Wright
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Patent number: 10889704Abstract: Methods of improving Mooney stability of a brominated elastomer comprising: neutralizing a brominated elastomer effluent with a neutralizing agent and water to form a neutralized effluent comprising a hydrocarbon solvent; removing the solvent from the neutralized effluent to form a brominated elastomer slurry; and separating a brominated elastomer from the brominated elastomer slurry, wherein a Mooney stabilizer package comprising an amine-functional hindered amine stabilizer (HAS) and an acid scavenger can be added, together or separately, before the removing step are provided herein. The acid scavenger can comprise a protonatable atom with a pKa greater than the pKa of the HAS nitrogen atom. The separated brominated elastomer can have a delta Mooney of not more than about 10 Mooney units after ˜7 days at ˜80° C. Stabilized brominated elastomer compositions can be made using this method, and articles can be made from those compositions.Type: GrantFiled: March 28, 2018Date of Patent: January 12, 2021Assignee: ExxonMobil Chemical Patents Inc.Inventors: Leming Gu, Thomas R. Barbee, Joel E. Schmieg
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Publication number: 20200255643Abstract: A system for producing a functionalized olefinic-based polymer, the system comprising a polymerization zone for producing an olefinic-based polymer comprising a mixing section, a deliquifying section, and a quenching section, wherein at least one section of the polymerization zone has a defined cross-sectional area that continually decreases from a first end to a second end of said section; a devolatilization zone comprising a kneader or extruder, wherein said devolatilization zone is downstream of said polymerization zone and in fluid communication with said polymerization zone; and a functionalization zone downstream of said devolatilization zone and in fluid communication with said devolatilization zone.Type: ApplicationFiled: December 9, 2016Publication date: August 13, 2020Inventors: Yu Feng Wang, Richard D. Hembree, Michael F. McDonald, JR., Joseph A. Maier, Richard C.M. Yeh, Leming Gu, Timothy D. Shaffer, Pamela J. Wright
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Patent number: 10479845Abstract: This invention relates to a method of preparing a brominated elastomer having a stabilized Mooney viscosity. The method includes polymerizing isomonoolefins and at least one polymerizable unit to obtain an elastomer/polymer; brominating the elastomer/polymer to form a brominated elastomer effluent; neutralizing the brominated elastomer effluent to form a neutralized effluent; volatizing off the hydrocarbon solvent; and recovering a brominated elastomer. In at least one point of the process, preferably prior to any significant temperature change in the brominated polymer, a Mooney stabilizer is added into the system. Portions of the Mooney stabilizer may be added at multiple points into the process.Type: GrantFiled: September 11, 2015Date of Patent: November 19, 2019Assignee: ExxonMobil Chemical Patents Inc.Inventors: Leming Gu, Stephen T. Dalpe, Mauritz Kelchtermans, Sunny Jacob, John A. Clark, Michael F. McDonald, Jr., Torri L. Rose
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Publication number: 20180334555Abstract: Methods of improving Mooney stability of a brominated elastomer comprising: neutralizing a brominated elastomer effluent with a neutralizing agent and water to form a neutralized effluent comprising a hydrocarbon solvent; removing the solvent from the neutralized effluent to form a brominated elastomer slurry; and separating a brominated elastomer from the brominated elastomer slurry, wherein a Mooney stabilizer package comprising an amine-functional hindered amine stabilizer (HAS) and an acid scavenger can be added, together or separately, before the removing step are provided herein. The acid scavenger can comprise a protonatable atom with a pKa greater than the pKa of the HAS nitrogen atom. The separated brominated elastomer can have a delta Mooney of not more than about 10 Mooney units after ˜7 days at ˜80° C. Stabilized brominated elastomer compositions can be made using this method, and articles can be made from those compositions.Type: ApplicationFiled: March 28, 2018Publication date: November 22, 2018Inventors: Leming Gu, Thomas R. Barbee, Joel E. Schmieg
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Publication number: 20180085989Abstract: A system for halogenating olefinic-based elastomer, the system comprising a first extruder, a first kneader vessel downstream of said first extruder and in fluid communication with said first extruder, a second extruder downstream of said first kneader vessel and in fluid communication with said first kneader vessel, a second kneader vessel downstream of said second extruder and in fluid communication with said second extruder; and a third extruder downstream of said second kneader vessel and in fluid communication with said second kneader vessel.Type: ApplicationFiled: March 22, 2016Publication date: March 29, 2018Inventors: Richard D. Hembree, Michael F. McDonald, Joseph A. Maier, Leming Gu, Yu Feng Wang
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Publication number: 20170226238Abstract: This invention relates to a method of preparing a brominated elastomer having a stabilized Mooney viscosity. The method includes polymerizing isomonoolefins and at least one polymerizable unit to obtain an elastomer/polymer; brominating the elastomer/polymer to form a brominated elastomer effluent; neutralizing the brominated elastomer effluent to form a neutralized effluent; volatizing off the hydrocarbon solvent; and recovering a brominated elastomer. In at least one point of the process, preferably prior to any significant temperature change in the brominated polymer, a Mooney stabilizer is added into the system. Portions of the Mooney stabilizer may be added at multiple points into the process.Type: ApplicationFiled: September 11, 2015Publication date: August 10, 2017Inventors: Leming Gu, Stephen T. Dalpe, Mauritz Kelchtermans, Sunny Jacob, John A. Clark, Michael F. McDonald, Torri L. Rose
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Patent number: 9266849Abstract: A process for recovering a divinylarene dioxide from a crude feed stream comprising the steps of: (a) providing an effluent reaction stream containing at least one divinylarene dioxide product and other compounds; and (b) separating/recovering the divinylarene dioxide product from the other compounds of the reaction effluent from step (a); wherein the percent recovery of the divinylarene dioxide product recovered comprises greater than about 85 percent; and wherein the percent purity of the divinylarene dioxide product recovered comprises greater than about 85 percent.Type: GrantFiled: November 27, 2012Date of Patent: February 23, 2016Assignee: Blue Cube IP LLCInventors: Leming Gu, William W. Fan, Bruce D. Hook, David Jean, Dennis W. Jewell
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Publication number: 20150232437Abstract: A process for recovering a divinylarene dioxide from a crude feed stream comprising the steps of: (a) providing an effluent reaction stream containing at least one divinylarene dioxide product and other compounds; and (b) separating/recovering the divinylarene dioxide product from the other compounds of the reaction effluent from step (a); wherein the percent recovery of the divinylarene dioxide product recovered comprises greater than about 85 percent; and wherein the percent purity of the divinylarene dioxide product recovered comprises greater than about 85 percent.Type: ApplicationFiled: November 27, 2012Publication date: August 20, 2015Inventors: Leming Gu, William W. Fan, Bruce D. Hook, David Jean, Dennis W. Jewell
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Patent number: 8742055Abstract: Use a modified, amine-functionalized anion exchange resin as a catalyst to produce a bishalohydrin ether and then dehydrohalogenate the bishalohydrin ether with an aqueous inorganic hydroxide mixture to yield a liquid epoxy resin.Type: GrantFiled: December 7, 2010Date of Patent: June 3, 2014Assignee: Dow Global Technologies LLCInventors: Philip J. Carlberg, H. Robert Goltz, Leming Gu, William I. Harris, David H. West, William G. Worley, Thomas C. Young
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Patent number: 8716502Abstract: A process for preparing a divinylarene oxide including (a) reacting (i) at least one divinylarene; (ii) at least one peroxycarboximidic acid; (iii) at least one solvent; and (iv) at least one basic compound, under reaction conditions to form a reaction effluent containing a divinylarene oxide product; and then (b) evaporating the reaction effluent of step (a) to form a concentrate containing the divinylarene oxide product; and wherein the concentrate separates into two liquid phases.Type: GrantFiled: December 7, 2011Date of Patent: May 6, 2014Assignee: Dow Global Technologies LLCInventors: Leming Gu, William W. Fan, David Jean, Eric B. Ripplinger, Bruce D. Hook, David H. West
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Publication number: 20130267720Abstract: A process for preparing a divinylarene oxide including (a) reacting (i) at least one divinylarene; (ii) at least one peroxycarboximidic acid; (iii) at least one solvent; and (iv) at least one basic compound, under reaction conditions to form a reaction of fluent containing a divinylarene oxide product; and then (b) evaporating the reaction effluent of step (a) to form a concentrate containing the divinylarene oxide product; and wherein the concentrate separates into two liquid phases.Type: ApplicationFiled: December 7, 2011Publication date: October 10, 2013Applicant: DOW GLOBAL TECHNOLOGIES LLCInventors: Leming Gu, William W. Fan, David Jean, Eric B. Ripplinger, Bruce D. Hook, David H. West
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Publication number: 20120283453Abstract: Use a modified, amine-functionalized anion exchange resin as a catalyst to produce a bishalohydrin ether and then dehydrohalogenate the bishalohydrin ether with an aqueous inorganic hydroxide mixture to yield a liquid epoxy resin.Type: ApplicationFiled: December 7, 2010Publication date: November 8, 2012Applicant: Dow Global Technologies LLCInventors: Philip J. Carlberg, H. Robert Goltz, Leming Gu, William I. Harris, David H. West, William G. Worley, Thomas C. Young
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Publication number: 20120141793Abstract: A method of making an epoxy resin by condensing a polyphenol and a compound selected from epichlorohydrin, 1,3-dichloro-2-propanol, and homologs thereof in water that is free of added organic solvent at an elevated temperature and in the presence of a catalyst. The method comprises carrying out the condensation in the presence of a dispersion promoting agent whose solubility in water decreases with increasing temperature.Type: ApplicationFiled: August 24, 2009Publication date: June 7, 2012Inventors: Leming Gu, Philip J. Carlberg, David L. Burow