Patents by Inventor Daylan T. Sheppard

Daylan T. Sheppard 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).

  • Urethane exchange catalysts and methods for reprocessing cross-linked polyurethanes
    Patent number: 12116450
    Abstract: Disclosed herein are polyurethane compositions and methods for reprocessing cross-linked polyurethane compositions. The polyurethane composition comprises a network polymer and a polyurethane exchange catalyst permeated within the network polymer. The network polymer comprises a dynamic network formed from an isocyanate constitutional unit and a second constitution unit having a hydroxyl group capable of reacting with an isocyanate group of the isocyanate constitutional unit to form a urethane bond. The catalyst comprises a metal atom and a ligand coordinated to the metal atom.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: October 15, 2024
    Assignees: Northwestern University, Cornell University
    Inventors: David J. Fortman, William R. Dichtel, Daylan T. Sheppard
  • URETHANE EXCHANGE CATALYSTS AND METHODS FOR REPROCESSING CROSS-LINKED POLYURETHANE FOAMS
    Publication number: 20220267562
    Abstract: Disclosed herein are methods for reprocessing polyurethane compositions such as polyurethane foams. The method comprises introducing a polyurethane composition into a compounding device, heating the polyurethane composition to an effective bond-exchange temperature, and compounding the polyurethane composition for an effective bond-exchange time.
    Type: Application
    Filed: April 23, 2020
    Publication date: August 25, 2022
    Inventors: David J. Fortman, William R. Dichtel, Daylan T. Sheppard, Kailong Jin, Christopher J. Ellison
  • URETHANE EXCHANGE CATALYSTS AND METHODS FOR REPROCESSING CROSS-LINKED POLYURETHANES
    Publication number: 20210095067
    Abstract: Disclosed herein are polyurethane compositions and methods for reprocessing cross-linked polyurethane compositions. The polyurethane composition comprises a network polymer and a poluyurethane exchange catalyst permeated within the network polymer. The network polymer comprises a dynamic network formed from an isocyanate constitutional unit and a second constitution unit having a hydroxyl group capable of reacting with an isocyanate group of the isocyanate constitutional unit to form a urethane bond. The catalyst comprises a metal atom and a ligand coordinated to the metal atom.
    Type: Application
    Filed: April 25, 2019
    Publication date: April 1, 2021
    Inventors: David J. Fortman, William R. Dichtel, Daylan T. Sheppard