Production and use of non-isocyanate polyurethanes based on cyclic carbonate oligomers. A suitable non-isocyanate polyurethane and a hybrid polymer comprising other different oligomeric systems. Pollution of unstable biuret and allophanate units.
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Similar catalyst systems are used also for the copolymerization of epoxides and CO2 and ring-opening polymerization of cyclic carbonates [23, 24], and one or the other direction of the reaction depends on the process conditions. Preparative synthesis of mono- and polycyclic carbonates for research purposes are provided by the company Specific Polymers, France [25]. Bernard (Rhodia) propose a method for preparing polyhydroxy-urethanes, said method comprising reacting at least one compound (1) having a cyclic carbonate functional group and at least one hydroxyl functional group; at least one compound (2) having at least one linear carbonate functional group; at least one compound (3) having at least one primary or secondary amine functional group [26].
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