Patents by Inventor Nhi Dang

Nhi 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).

  • Patent number: 10696757
    Abstract: 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: Grant
    Filed: November 10, 2016
    Date of Patent: June 30, 2020
    Assignee: Dow Global Technologies LLC
    Inventors: Otto J. Berbee, Joaquin Flores, Cornelis J F Hosman, Nhi Dang
  • Patent number: 10494456
    Abstract: 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: Grant
    Filed: November 10, 2016
    Date of Patent: December 3, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Otto J. Berbee, Joaquin Flores, Cornelis J F Hosman, Nhi Dang
  • Patent number: 10435489
    Abstract: Ethylene-based polymer is made by a process comprising polymerizing a reaction mixture comprising ethylene and at least one chain transfer agent system; wherein the polymerization takes place in the presence of at least one free-radical initiator; and wherein the polymerization takes place in a reactor configuration comprising at least one tubular reactor with at least three reaction zones; and wherein at least two reaction zones receive an ethylene feed; and wherein the degree of polymerization in the first reaction zone is less than, or equal to, (5/LCBf)*3150; and wherein the ethylene-based polymer formed by the process comprises the following properties: (A) LCBf?(4.7+0.5*log(I2)); and (B) I2 from 0.2 to 25 dg/min.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: October 8, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Otto Berbee, Stefan Hinrichs, Nhi Dang, Juergen Siebdrat, Cornelis F. J. Den Doelder
  • Patent number: 10273318
    Abstract: 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 consumption
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: April 30, 2019
    Assignee: Dow Global Technologies LLC
    Inventors: Cornelis J F Hosman, Otto J. Berbee, Sergio E. Goncalves, Nhi Dang
  • Publication number: 20180265611
    Abstract: Ethylene-based polymer is made by a process comprising polymerizing a reaction mixture comprising ethylene and at least one chain transfer agent system; wherein the polymerization takes place in the presence of at least one free-radical initiator; and wherein the polymerization takes place in a reactor configuration comprising at least one tubular reactor with at least three reaction zones; and wherein at least two reaction zones receive an ethylene feed; and wherein the degree of polymerization in the first reaction zone is less than, or equal to, (5/LCBf)*3150; and wherein the ethylene-based polymer formed by the process comprises the following properties: (A) LCBf?(4.7+0.5*log(I2)); and (B) I2 from 0.2 to 25 dg/min.
    Type: Application
    Filed: September 20, 2016
    Publication date: September 20, 2018
    Inventors: Otto Berbee, Stefan Hinrichs, Nhi Dang, Juergen Siebdrat, Cornelis F.J. Den Doelder