US 12,325,778 B2
Urethane exchange catalysts and methods for reprocessing cross-linked polyurethane foams
David J. Fortman, Pittsburgh, PA (US); William R. Dichtel, Wilmette, IL (US); Daylan T. Sheppard, Evanston, IL (US); Kailong Jin, Minneapolis, MN (US); and Christopher J. Ellison, Eden Prairie, MN (US)
Assigned to Northwestern University, Evanston, IL (US); Cornell University, Ithaca, NY (US); and Regents of the University of Minnesota, Minneapolis, MN (US)
Appl. No. 17/605,831
Filed by Northwestern University, Evanston, IL (US); Cornell University, Ithaca, NY (US); and Regents of the University of Minnesota, Minneapolis, MN (US)
PCT Filed Apr. 23, 2020, PCT No. PCT/US2020/029502
§ 371(c)(1), (2) Date Oct. 22, 2021,
PCT Pub. No. WO2020/219663, PCT Pub. Date Oct. 29, 2020.
Claims priority of provisional application 62/837,606, filed on Apr. 23, 2019.
Prior Publication US 2022/0267562 A1, Aug. 25, 2022
Int. Cl. C08J 11/26 (2006.01); B01J 31/04 (2006.01); B01J 31/22 (2006.01); C08G 18/08 (2006.01); C08G 18/12 (2006.01); C08G 18/24 (2006.01); C08G 18/42 (2006.01); C08G 18/48 (2006.01); C08G 18/76 (2006.01)
CPC C08J 11/26 (2013.01) [B01J 31/04 (2013.01); B01J 31/2234 (2013.01); C08G 18/12 (2013.01); C08G 18/14 (2013.01); C08G 18/242 (2013.01); C08G 18/42 (2013.01); C08G 18/4812 (2013.01); C08G 18/4833 (2013.01); C08G 18/7671 (2013.01); B01J 2531/54 (2013.01); B01J 2531/842 (2013.01); C08G 2110/0025 (2021.01); C08J 2375/06 (2013.01); C08J 2375/08 (2013.01)] 20 Claims
 
1. A method for reprocessing a polyurethane composition, the method comprising 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, wherein the polyurethane composition comprises a network polymer and an effective amount of a polyurethane exchange catalyst permeated within the network polymer, wherein the network polymer comprises a dynamic network formed from an isocyanate constitutional unit and a second constitutional unit having a hydroxyl group capable of reacting with an isocyanate group of the isocyanate constitutional unit to form a urethane bond.