DEPOLYMERIZATION OF POLYURETHANES: REGENERATION OF ISOCYANATES VIA CHEMICAL RECYCLING

Abstract: the present invention discloses a one-step polyurethane (pu) depolymerization to recover isocyanates and regenerate both thermoplastic and thermoset pus. the method uses a halide-containing boron compound to depolymerize pus directly to isocyanates under mild conditions (e.g., <100� c. in toluene). also, disclosed herein is depolymerization of both model and commercially available pus and regeneration of pus using recovered isocyanates, with molecular weight distributions and thermomechanical properties that are equivalent to virgin pus with yields of up to 50%.

Inventor(s): Mridula NANDI, Robert M. O'DEA, Thomas H. EPPS, LaShanda T.J. KORLEY

CPC Classification: C08J11/22 (by treatment with organic oxygen-containing compounds)

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