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In the present study, the synthesis of bis(cyclic carbonate) fTom carbon dioxide and bisphenol A ( or bisphenol S )-diglycidyl ether was investigated using quaternary ammonium salts as catalyst. Among the salts tested, the one having a larger alkyl group and more nucleophflic counter anion exhibited a better catalytic activity. Poly(hydmxyurethane)s were prepared by the polyaddition reaction of bis(cyclic carbonate) and diamine. The poly(hydroxyurethane) has shown higher thermal stability than conventional polyurethane, and is expected as novel reactive polyurethane. The miscibility of blends containing poly(hydroxyurethane) and poly(styrene-co-acrylonitrileXSAN) has been also studied by the optical clarity method and DSC.