Bungo Ochiai and Tomohisa Utsuno Non-isocyanate synthesis and application of telechelic polyurethanes via polycondensation of diurethanes obtained from ethylene carbonate and diamines Journal of Polymer Science Part A: Polymer Chemistry 51
Aliphatic polyurethanes could be obtained in high yields via a non-isocyanate method based on the self-polycondensation of dihydroxyurethanes obtained by the reaction of diamines and ethylene carbonate. Two-step polycondensation, consisting of the polycondensation under a N2 atmosphere followed by that under reduced pressure, was effective. The resulting polyurethane having hydroxyl groups at both of the end groups was converted to polyurethane methacrylate that served as a crosslinker for radical polymerization of methyl acrylate.
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