Patents by Inventor Nhi T. Y. Dang
Nhi T. Y. Dang 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: 20210309767Abstract: A high pressure polymerization to form an ethylene-based polymer, the process comprising the following: polymerizing a reaction mixture comprising ethylene, using a reactor system comprising at least three ethylene-based feed streams and a reactor configuration that comprises at least four reaction zones.Type: ApplicationFiled: June 18, 2021Publication date: October 7, 2021Inventors: Cornelis J.F. Hosman, Nhi T.Y. Dang, Otto J. Berbee, Joaquin Flores
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Patent number: 11111322Abstract: A polyethylene homopolymer comprising the following properties: a) a melt index (I2) from 1.0 to 3.5 dg/min; b) a Mw(abs) versus I2 relationship: Mw(abs)?A+B(I2), where A=3.20×105 g/mole, and B=?8.00×103 (g/mole)/(dg/min); c) a Mw(abs) versus I2 relationship: Mw(abs)?C+D(I2), where C=3.90×105 g/mole, and D=?8.00×103 (g/mole)/(dg/min).Type: GrantFiled: July 13, 2018Date of Patent: September 7, 2021Assignee: Dow Global Technologies LLCInventors: Cornelis F. J. Den Doelder, Nhi T. Y. Dang, Eva-Maria Kupsch, Edward L. Lee
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Patent number: 11078301Abstract: A high pressure polymerization, as described herein, to form an ethylene-based polymer, comprising the following steps: polymerizing a reaction mixture comprising ethylene, using a reactor system comprising at least three ethylene-based feed streams and a reactor configuration that comprises at least four reaction zones, and at least one of the following a) through c), is met: (a) up to 100 wt % of the ethylene stream to the first zone comes from a high pressure recycle, and/or up to 100 wt % of the last ethylene stream to a zone comes from the output from a Primary compressor system; and/or (b) up to 100 wt % of the ethylene stream to first zone comes from the output from a Primary compressor system, and/or up to 100 wt % of the last ethylene stream to a zone comes from a high pressure recycle; and/or (c) the ethylene stream to the first zone, and/or the last ethylene stream to a zone, each comprises a controlled composition; and wherein each ethylene stream to a zone receives an output from two or more cyliType: GrantFiled: June 22, 2017Date of Patent: August 3, 2021Assignee: Dow Global Technologies LLCInventors: Cornelis J F Hosman, Nhi T. Y. Dang, Otto J. Berbee, Joaquin Flores
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Patent number: 11072669Abstract: A process to form an ethylene-based polymer in a reactor system, said process comprising at least the following steps: a) injecting a first initiator mixture into the tubular reactor at location L along the reactor, b) injecting a compressed make-up CTA system at the location L1, at a distance (L?L1) from 145*Dprehehater to 1000*Dpreheater, upstream from L, and wherein Dpreheater=the inner diameter of the pre-heater in meter (m); and wherein L1 is located in the preheater, and c) optionally, injecting one or more additional compressed make-up CTA system(s) into the preheater, at one or more location: LiLi+1, Ln (2?i and 2?n), upstream from L1, and each location is, independently, at a distance from 145*Dprehehater to 1000*Dpreheater, and wherein n equals the total number of injection locations of the make-up CTA system(s) injected into the preheater, upstream from L1, and wherein (L?L1) is less than each (L?Li), (L?Li+1), (L?Ln); and d) polymerizing a reaction mixture comprising at least ethylene, the first iType: GrantFiled: June 26, 2018Date of Patent: July 27, 2021Assignee: Dow Global Technologies LLCInventors: Cornelis J F Hosman, Nhi T. Y. Dang
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Patent number: 10844146Abstract: A process to form an ethylene-based polymer, as described herein, in a tubular reactor system comprising at least three ethylene-based feeds, and at least four reaction zones, and where the weight ratio of “the ethylene-based feed to the second zone (EBF2)” to “the ethylene-based feed to the first zone (EBF1),” is from 0.50 to 1.10; and the weight ratio of “the ethylene-based feed to the third zone (EBF3)” to “the ethylene-based feed to the first zone (EBF1),” is from 0.40 to 2.50; in each zone, the polymerization takes place at a start temperature?135° C.; and (a) for three or more ethylene based feeds, the peak temperatures in the first and the second zones, are each from 200° C. to 250° C.; and/or (b) for four or more ethylene based feeds, the peak temperatures in the first, the second and the third zones, are each from 200° C. to 250° C.; and the differential in peak temperatures of the first three zones (TP1, TP2, TP3) meets at least one relationship described herein.Type: GrantFiled: June 22, 2017Date of Patent: November 24, 2020Assignee: Dow Global Technologies LLCInventors: Otto J. Berbee, Nhi T. Y. Dang, Cornelis J F Hosman, Joaquin Flores
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Publication number: 20200317826Abstract: A process to form an ethylene-based polymer, as described herein, in a tubular reactor system comprising at least three ethylene-based feeds, and at least four reaction zones, and where the weight ratio of “the ethylene-based feed to the second zone (EBF2)” to “the ethylene-based feed to the first zone (EBF1),” is from 0.50 to 1.10; and the weight ratio of “the ethylene-based feed to the third zone (EBF3)” to “the ethylene-based feed to the first zone (EBF1),” is from 0.40 to 2.50; in each zone, the polymerization takes place at a start temperature ?135° C.; and (a) for three or more ethylene based feeds, the peak temperatures in the first and the second zones, are each from 200° C. to 250° C.; and/or (b) for four or more ethylene based feeds, the peak temperatures in the first, the second and the third zones, are each from 200° C. to 250° C.; and the differential in peak temperatures of the first three zones (TP1, TP2, TP3) meets at least one relationship described herein.Type: ApplicationFiled: June 22, 2017Publication date: October 8, 2020Applicant: Dow Global Technologies LLCInventors: Otto J. Berbee, Nhi T. Y. Dang, Cornelis J F Hosman, Joaquin Flores
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Patent number: 10774159Abstract: A process to form an ethylene-based polymer comprising polymerizing a mixture comprising ethylene, in the presence of a free-radical initiator, and in a tubular reactor system comprising at least two ethylene-based feed streams, and a reactor configuration that comprises at least three reaction zones; and the inlet pressure of the first zone is <3200 Bar; and the ethylene conversion >28%, and an m value from 20 mole % to 70 mole %, where m=mol % of ethylene-based feed stream to the first zone, based on total moles of ethylene-based feed streams fed to the reactor configuration; and the ratio (Q) of a “MWDB of a broad polymer polymerized, to a “MWDN of a narrow polymer polymerized, is as follows: {(T)*(?2.3×log(m)+7)}?Q?{(T)*(?13.0×log(m)+29.8)}; at the same melt index; and “T” is the “chain transfer activity ratio” as described herein.Type: GrantFiled: June 22, 2017Date of Patent: September 15, 2020Assignee: Dow Global Technologies LLCInventors: Otto J. Berbee, Nhi T. Y. Dang, Cornelis J F Hosman, Joaquin Flores
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Publication number: 20200207889Abstract: A polyethylene homopolymer comprising the following properties: a) a melt index (I2) from 1.0 to 3.5 dg/min; b) a Mw(abs) versus I2 relationship: Mw(abs)?A+B(I2), where A=3.20×105 g/mole, and B=?8.00×103 (g/mole)/(dg/min); c) a Mw(abs) versus I2 relationship: Mw(abs)?C+D(I2), where C=3.90×105 g/mole, and D=?8.00×103 (g/mole)/(dg/min).Type: ApplicationFiled: July 13, 2018Publication date: July 2, 2020Applicant: Dow Global Technologies LLCInventors: Cornelis F.J. Den Doelder, Nhi T.Y. Dang, Eva-Maria Kupsch, Edward L. Lee
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Publication number: 20200140580Abstract: A process to form an ethylene-based polymer in a reactor system, said process comprising at least the following steps: a) injecting a first initiator mixture into the tubular reactor at location L along the reactor, b) injecting a compressed make-up CTA system at the location L1, at a distance (L?L1) from 145*Dprehehater to 1000*Dpreheater, upstream from L, and wherein Dpreheater=the inner diameter of the pre-heater in meter (m); and wherein L1 is located in the preheater, and c) optionally, injecting one or more additional compressed make-up CTA system(s) into the preheater, at one or more location: LiLi+1, Ln (2?i and 2?n), upstream from L1, and each location is, independently, at a distance from 145*Dprehehater to 1000*Dpreheater, and wherein n equals the total number of injection locations of the make-up CTA system(s) injected into the preheater, upstream from L1, and wherein (L?L1) is less than each (L?Li), (L?Li+1), (L?Ln); and d) polymerizing a reaction mixture comprising at least ethylene, the first iType: ApplicationFiled: June 26, 2018Publication date: May 7, 2020Applicant: Dow Global Technologies LLCInventors: Cornelis J F Hosman, Nhi T. Y. Dang
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Publication number: 20190292279Abstract: A high pressure polymerization, as described herein, to form an ethylene-based polymer, comprising the following steps: polymerizing a reaction mixture comprising ethylene, using a reactor system comprising at least three ethylene-based feed streams and a reactor configuration that comprises at least four reaction zones, and at least one of the following a) through c), is met: (a) up to 100 wt % of the ethylene stream to the first zone comes from a high pressure recycle, and/or up to 100 wt % of the last ethylene stream to a zone comes from the output from a Primary compressor system; and/or (b) up to 100 wt % of the ethylene stream to first zone comes from the output from a Primary compressor system, and/or up to 100 wt % of the last ethylene stream to a zone comes from a high pressure recycle; and/or (c) the ethylene stream to the first zone, and/or the last ethylene stream to a zone, each comprises a controlled composition; and wherein each ethylene stream to a zone receives an output from two or more cyliType: ApplicationFiled: June 22, 2017Publication date: September 26, 2019Applicant: Dow Global Technologies LLCInventors: Cornelis J F Hosman, Nhi T. Y. Dang, Otto J. Berbee, Joaquin Flores
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Patent number: 10358512Abstract: The invention provides an ethylene homopolymer formed from a free-radical, high pressure polymerization process in a tubular reactor system, said homopolymer comprising the following properties: (A) a density from 0.9190 to 0.9250 g/cc; (B) a hexane extractable level that is less than, or equal to, 2.6 wt %, based on the total weight of the polymer; (C) a G (at G?=500 Pa, 170C) that meets the following equation: G>D+E[log(12)], where D=150 Pa and E=?60 Pa/[log(dg/min)]; and (D) a melt index (12) from 1.0 to 20 dg/min.Type: GrantFiled: June 23, 2016Date of Patent: July 23, 2019Assignee: Dow Global Technologies LLCInventors: Stefan Hinrichs, Cornelis F. J. Den Doelder, Nhi T. Y. Dang, Otto J. Berbee
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Publication number: 20190177443Abstract: A process to form an ethylene-based polymer comprising polymerizing a mixture comprising ethylene, in the presence of a free-radical initiator, and in a tubular reactor system comprising at least two ethylene-based feed streams, and a reactor configuration that comprises at least three reaction zones; and the inlet pressure of the first zone is <3200 Bar; and the ethylene conversion >28%, and an m value from 20 mole % to 70 mole %, where m=mol % of ethylene-based feed stream to the first zone, based on total moles of ethylene-based feed streams fed to the reactor configuration; and the ratio (Q) of a “MWDB of a broad polymer polymerized, to a “MWDN of a narrow polymer polymerized, is as follows: {(T)*(?2.3×log(m)+7)}?Q?{(T)*(?13.0×log(m)+29.8)}; at the same melt index; and “T” is the “chain transfer activity ratio” as described herein.Type: ApplicationFiled: June 22, 2017Publication date: June 13, 2019Applicant: Dow Global Technologies LLCInventors: Otto J. BERBEE, Nhi T. Y. DANG, Cornelis J F HOSMAN, Joaquin FLORES
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Publication number: 20180346613Abstract: The invention provides a process to prepare an ethylene-based polymer, said process comprising polymerizing ethylene in the presence of at least one initiator system selected from the following: a) class 1 initiator system, b) class 2 initiator system, c) class 3 initiator system, or d) a combination thereof; and at a inlet pressure (P2) greater than, or equal to, 1000 Bar (100 MPa); and in a reactor system comprising at least one hyper compressor and a reactor configuration comprising at least one reactor, which comprises at least one reaction zone; and wherein the inlet pressure (P2) is reduced by at least 200 Bar, as compared to a similar polymerization, in the same reactor system, except it is operated at a higher inlet pressure (P1), and at a different hyper compressor throughput, and at a different maximum temperature for at least one reaction zone, and optionally, at a different amount of CTA system fed to the reactor configuration; and wherein, for the process, the “Ratio of total reactor consumptionType: ApplicationFiled: December 18, 2015Publication date: December 6, 2018Applicants: Dow Global Technologies LLC, Dow Brasil Sudeste Industrial Ltda.Inventors: Cornelis J F Hosman, Otto J. Berbee, Sergio E. Goncalves, Nhi T. Y. Dang
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Publication number: 20180312614Abstract: A process to form an ethylene-based polymer, in the presence of at least one free-radical, said process comprises at least the following: polymerizing a mixture comprising ethylene in a reactor configuration comprising at least four reaction zones, and comprising at least three ethylene feed streams; and wherein the ratio of (RLCBf40%), in percent, of the LCB content of the “first 40 wt % of the total polymer formed” to the “total LCB content in the final polymer” is ?29%; and wherein the amount of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the first reaction zone, is from 20 mole % to 70 mole %, based on the total moles of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the polymerization.Type: ApplicationFiled: November 10, 2016Publication date: November 1, 2018Inventors: Otto J. Berbee, Joaquin Flores, Cornelis J F Hosman, Nhi T. Y. Dang
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Publication number: 20180305475Abstract: A process is provided to form an ethylene-based polymer, in the presence of at least one free-radical, said process comprises at least the following: polymerizing a mixture comprising ethylene, in a reactor configuration comprising at least three reaction zones, and comprising two ethylene feed streams, and wherein the ratio (RLCBf40%), in percent, of the “LCB content of the first 40 wt % of the total polymer formed” to “the total LCB content in the final polymer” is ?22.5%; and wherein the amount of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the first reaction zone, is from 40 mole % to 80 mole %, based on the total moles of ethylene, and optionally one or more comonomers, and optionally one or more CTAs, fed to the polymerization.Type: ApplicationFiled: November 10, 2016Publication date: October 25, 2018Inventors: Otto J. Berbee, Joaquin Flores, Cornelis J F Hosman, Nhi T. Y. Dang
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Publication number: 20180127523Abstract: The invention provides an ethylene homopolymer formed from a free-radical, high pressure polymerization process in a tubular reactor system, said homopolymer comprising the following properties: (A) a density from 0.9190 to 0.9250 g/cc; (B) a hexane extractable level that is less than, or equal to, 2.6 wt %, based on the total weight of the polymer; (C) a G? (at G?=500 Pa, 170 C) that meets the following equation: G??D+E[log (I2)], where D=150 Pa and E=?60 Pa/[log(dg/min)]; and (D) a melt in dex (I2) from 1.0 to 20 dg/min.Type: ApplicationFiled: June 23, 2016Publication date: May 10, 2018Inventors: Stefan Hinrichs, Cornelis F. J. Den Doelder, Nhi T. Y. Dang, Otto J. Berbee