Urethane exchange catalysts and methods for reprocessing cross-linked polyurethane foams
AssigneesNorthwestern University, Cornell University, Regents of the University of Minnesota
InventorsDavid J. Fortman, William R. Dichtel, Daylan T. Sheppard, Kailong Jin, Christopher J. Ellison
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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.
Claims20
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.
Dependencies are inferred from the claim text.