Patents by Inventor William J. Zafian

William J. Zafian 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).

  • High pressure polyethylene tubular reactor processes for improved wire coating product
    Patent number: 11325999
    Abstract: Methods for producing polyethylene compositions having broader melt index ratio and narrower molecular weight distribution in high pressure multi-feed tubular reactors are provided. The methods are useful in multi-feed tubular reactors comprising three or more reaction zones. The first reaction zone or the first and second reaction zone having a peak temperature that is lower than standard peak temperatures for polymerization of ethylene monomer in a tubular reactor.
    Type: Grant
    Filed: September 8, 2020
    Date of Patent: May 10, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: William J. Zafian, Henri A. Lammens
  • Methods and systems for the production of high molecular weight ethylene-based polymers
    Patent number: 11292857
    Abstract: Processes and systems for preparing copolymers of ethylene and a polar comonomer include contacting an initial feed comprising ethylene and a polar comonomer with a first polymerization initiator in a continuous stirred tank reactor to form a first polymer, which may then be contacted with second polymerization initiator in a plug flow reactor to form a second polymer. The process yields a second polymer having a lower melt flow index (and higher molecular weight) with high polar comonomer content. The polar comonomer may be, for example, vinyl acetate to prepare a poly(ethylene-vinyl acetate) copolymer having a vinyl acetate content of up to about 33% while maintaining the melt flow rate less than about 10 g/10 minutes without the use of fillers.
    Type: Grant
    Filed: September 3, 2020
    Date of Patent: April 5, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventor: William J. Zafian
  • Methods And Systems For The Production Of High Molecular Weight Ethylene-Based Polymers
    Publication number: 20210130514
    Abstract: Processes and systems for preparing copolymers of ethylene and a polar comonomer include contacting an initial feed comprising ethylene and a polar comonomer with a first polymerization initiator in a continuous stirred tank reactor to form a first polymer, which may then be contacted with second polymerization initiator in a plug flow reactor to form a second polymer. The process yields a second polymer having a lower melt flow index (and higher molecular weight) with high polar comonomer content. The polar comonomer may be, for example, vinyl acetate to prepare a poly(ethylene-vinyl acetate) copolymer having a vinyl acetate content of up to about 33% while maintaining the melt flow rate less than about 10 g/10 minutes without the use of fillers.
    Type: Application
    Filed: September 3, 2020
    Publication date: May 6, 2021
    Inventor: William J. Zafian
  • High Pressure Polyethylene Tubular Reactor Processes For Improved Wire Coating Product
    Publication number: 20210095060
    Abstract: Methods for producing polyethylene compositions having broader melt index ratio and narrower molecular weight distribution in high pressure multi-feed tubular reactors are provided. The methods are useful in multi-feed tubular reactors comprising three or more reaction zones. The first reaction zone or the first and second reaction zone having a peak temperature that is lower than standard peak temperatures for polymerization of ethylene monomer in a tubular reactor.
    Type: Application
    Filed: September 8, 2020
    Publication date: April 1, 2021
    Inventors: William J. Zafian, Henri A. Lammens