Patents by Inventor Bryan Dawson

Bryan Dawson 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).

  • Propylene preliminary polymerization
    Patent number: 12319756
    Abstract: A process for propylene preliminary polymerization in liquid phase that occurs in a continuous preliminary polymerization reactor may include feeding a propylene monomer and a Ziegler-Natta catalyst system having (a) a pro-catalyst having an internal electron donor comprising a substituted phenylene aromatic diester, (b) a catalyst activator and optionally (c) an external donor, into the continuous preliminary polymerization reactor, wherein the feeding is carried out without pre-contact of the pro-catalyst with the catalyst activator, and also without pre-contact of the catalyst activator with the propylene monomer before entering the continuous preliminary polymerization reactor.
    Type: Grant
    Filed: June 27, 2022
    Date of Patent: June 3, 2025
    Assignee: BRASKEM S. A.
    Inventors: Olavo Martins Junior, Dihogenes Adriano Pozzer, Élita Cavalli, Thiago Roberto Almeida, Bryan Dawson
  • PROPYLENE PRELIMINARY POLYMERIZATION
    Publication number: 20220411545
    Abstract: A process for propylene preliminary polymerization in liquid phase that occurs in a continuous preliminary polymerization reactor may include feeding a propylene monomer and a Ziegler-Natta catalyst system having (a) a pro-catalyst having an internal electron donor comprising a substituted phenylene aromatic diester, (b) a catalyst activator and optionally (c) an external donor, into the continuous preliminary polymerization reactor, wherein the feeding is carried out without pre-contact of the pro-catalyst with the catalyst activator, and also without pre-contact of the catalyst activator with the propylene monomer before entering the continuous preliminary polymerization reactor.
    Type: Application
    Filed: June 27, 2022
    Publication date: December 29, 2022
    Applicant: Braskem S.A.
    Inventors: Olavo Martins Junior, Dihogenes Adriano Pozzer, Élita Cavalli, Thiago Roberto Almeida, Bryan Dawson
  • Low emission propylene-based polymer resins
    Patent number: 10479849
    Abstract: A propylene-based polymer resin is characterized by a low volatile emission signature. For example, the propylene-based polymer resin may have a volatile organic compound content no greater than 125 ppm, a semi-volatile organic compound content no greater than 500 ppm, and a C36 oligomeric content no greater than 250 ppm.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: November 19, 2019
    Assignee: BRASKEM AMERICA, INC.
    Inventors: Jeffrey Salek, Mark Chappell, Bryan Dawson
  • LOW EMISSION PROPYLENE-BASED POLYMER RESINS
    Publication number: 20170121432
    Abstract: A propylene-based polymer resin is characterized by a low volatile emission signature. For example, the propylene-based polymer resin may have a volatile organic compound content no greater than 125 ppm, a semi-volatile organic compound content no greater than 500 ppm, and a C36 oligomeric content no greater than 250 ppm.
    Type: Application
    Filed: November 2, 2016
    Publication date: May 4, 2017
    Inventors: Jeffrey Salek, Mark Chappell, Bryan Dawson