Patents by Inventor Vivek Rohatgi

Vivek Rohatgi 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).

  • Publication number: 20220098342
    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.
    Type: Application
    Filed: December 10, 2021
    Publication date: March 31, 2022
    Inventors: Vivek Rohatgi, Ashish M. Sukhadia, Yongwoo Inn, Elizabeth M. Lanier
  • Patent number: 11225538
    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.
    Type: Grant
    Filed: January 28, 2020
    Date of Patent: January 18, 2022
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Vivek Rohatgi, Ashish M. Sukhadia, Yongwoo Inn, Elizabeth M. Lanier
  • Publication number: 20200157260
    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.
    Type: Application
    Filed: January 28, 2020
    Publication date: May 21, 2020
    Inventors: Vivek Rohatgi, Ashish M. Sukhadia, Yongwoo Inn, Elizabeth M. Lanier
  • Patent number: 10590213
    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: March 17, 2020
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Vivek Rohatgi, Ashish M. Sukhadia, Yongwoo Inn, Elizabeth M. Lanier
  • Publication number: 20190284315
    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.
    Type: Application
    Filed: March 13, 2018
    Publication date: September 19, 2019
    Inventors: Vivek Rohatgi, Ashish M. Sukhadia, Yongwoo Inn, Elizabeth M. Lanier
  • Publication number: 20180273712
    Abstract: Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.
    Type: Application
    Filed: May 25, 2018
    Publication date: September 27, 2018
    Inventors: Lili Cui, Ashish M. Sukhadia, Vivek Rohatgi
  • Patent number: 10017617
    Abstract: Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: July 10, 2018
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Lili Cui, Ashish M. Sukhadia, Vivek Rohatgi
  • Patent number: 9994659
    Abstract: A crosslinked metallocene-catalyzed polyethylene copolymer having a higher molecular weight (HMW) component and lower molecular weight (LMW) component wherein the HMW component is present in an amount of from about 10 wt. % to about 30 wt. % and wherein the LMW component is present in an amount of from about 70 wt. % to about 90 wt. %.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: June 12, 2018
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Vivek Rohatgi, Yongwoo Inn, Ashish M. Sukhadia, Qing Yang, Paul J. DesLauriers
  • Publication number: 20180044454
    Abstract: A crosslinked metallocene-catalyzed polyethylene copolymer having a higher molecular weight (HMW) component and lower molecular weight (LMW) component wherein the HMW component is present in an amount of from about 10 wt. % to about 30 wt. % and wherein the LMW component is present in an amount of from about 70 wt. % to about 90 wt. %.
    Type: Application
    Filed: October 24, 2017
    Publication date: February 15, 2018
    Inventors: Vivek Rohatgi, Yongwoo Inn, Ashish M. Sukhadia, Qing Yang, Paul J. DesLauriers
  • Patent number: 9828451
    Abstract: A crosslinked metallocene-catalyzed polyethylene copolymer having a higher molecular weight (HMW) component and lower molecular weight (LMW) component wherein the HMW component is present in an amount of from about 10 wt. % to about 30 wt. % and wherein the LMW component is present in an amount of from about 70 wt. % to about 90 wt. %.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: November 28, 2017
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Vivek Rohatgi, Yongwoo Inn, Ashish M. Sukhadia, Qing Yang, Paul J. DesLauriers
  • Publication number: 20170306114
    Abstract: Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.
    Type: Application
    Filed: July 7, 2017
    Publication date: October 26, 2017
    Inventors: Lili Cui, Ashish M. Sukhadia, Vivek Rohatgi
  • Patent number: 9732197
    Abstract: Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: August 15, 2017
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Lili Cui, Ashish M. Sukhadia, Vivek Rohatgi
  • Patent number: 9650459
    Abstract: Methods for controlling the die swell of an olefin polymer produced using a dual catalyst system are disclosed. The die swell of the olefin polymer can be increased or decreased as a function of the catalyst weight ratio and the reactant molar ratio used during the olefin polymerization process.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: May 16, 2017
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Jeff F Greco, Qing Yang, Vivek Rohatgi, Mark L. Hlavinka, Jim B Askew
  • Publication number: 20170066857
    Abstract: Methods for controlling the die swell of an olefin polymer produced using a dual catalyst system are disclosed. The die swell of the olefin polymer can be increased or decreased as a function of the catalyst weight ratio and the reactant molar ratio used during the olefin polymerization process.
    Type: Application
    Filed: September 9, 2015
    Publication date: March 9, 2017
    Inventors: Jeff F. Greco, Qing Yang, Vivek Rohatgi, Mark L. Hlavinka, Jim B. Askew
  • Patent number: 9493589
    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a density greater than 0.954 g/cm3, high load melt index ranging from 10 to 45 g/10 min, a ratio of high load melt index to melt index ranging from 175 to 600, a rheological slope parameter ranging from 0.15 to 0.30, and an ESCR in 10% igepal exceeding 800 hours. These polymers have the beneficial processability and die swell features of chromium-based resins, but with improved stiffness and stress crack resistance, and can be used in blow molding and other end-use applications.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: November 15, 2016
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Jeff F Greco, Qing Yang, Vivek Rohatgi, Mark L. Hlavinka, Jim B Askew
  • Patent number: 9475898
    Abstract: Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm3, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. These polymers have the processability of chromium-based resins, but with improved stiffness and stress crack resistance, and can be used in blow molding and other end-use applications.
    Type: Grant
    Filed: September 21, 2015
    Date of Patent: October 25, 2016
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Vivek Rohatgi, Jeffrey F. Greco, Yongwoo Inn, Qing Yang, Alfred E. Brown, Jr.
  • Publication number: 20160229967
    Abstract: Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.
    Type: Application
    Filed: April 21, 2016
    Publication date: August 11, 2016
    Inventors: Lili Cui, Ashish M. Sukhadia, Vivek Rohatgi
  • Patent number: 9346897
    Abstract: Disclosed herein are ethylene-based polymers having low densities and narrow molecular weight distributions, but high melt strengths for blown film processing. Such polymers can be produced by peroxide-treating a metallocene-catalyzed resin.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: May 24, 2016
    Assignee: Chevron Phillips Chemical Company LP
    Inventors: Lili Cui, Ashish M. Sukhadia, Vivek Rohatgi
  • Publication number: 20160115264
    Abstract: A crosslinked metallocene-catalyzed polyethylene copolymer having a higher molecular weight (HMW) component and lower molecular weight (LMW) component wherein the HMW component is present in an amount of from about 10 wt. % to about 30 wt. % and wherein the LMW component is present in an amount of from about 70 wt. % to about 90 wt. %.
    Type: Application
    Filed: October 24, 2014
    Publication date: April 28, 2016
    Inventors: Vivek Rohatgi, Yongwoo Inn, Ashish M. Sukhadia, Qing Yang, Paul J. DesLauriers
  • Publication number: 20160053035
    Abstract: Disclosed herein are ethylene-based polymers having a higher molecular weight component and a lower molecular weight component, and characterized by a density greater than 0.945 g/cm3, a melt index less than 1.5 g/10 min, and a ratio of high load melt index to melt index ranging from 40 to 175. These polymers have the processability of chromium-based resins, but with improved stiffness and stress crack resistance, and can be used in blow molding and other end-use applications.
    Type: Application
    Filed: September 21, 2015
    Publication date: February 25, 2016
    Inventors: Vivek Rohatgi, Jeffrey F. Greco, Yongwoo Inn, Qing Yang, Alfred E. Brown, JR.