Urethane exchange catalysts and methods for reprocessing cross-linked polyurethanes

Urethane exchange catalysts and methods for reprocessing cross-linked polyurethanes

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 form...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Fortman, David J, Dichtel, William R, Sheppard, Daylan T
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung: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.