Novel Polymerization Method for Polyamides by the Reaction of 2-Methyl-2-oxazoline with Aromatic Diisocyanates

Preparation methods for polyamides have been well established and various polyamides are commercially produced mainly either by polycondensation reaction of diacids and diamines, or by ring-opening polymerization of lactames. Further, several efforts focusing on developing new preparation methods for polyamides have been made for applying reaction injection molding by employing isocyanates and enamines. We have been studding ketene cyclic acetal chemistry and have designed ketene cyclic N,O-acetals by taking into consideration the fact that the beta -carbon atoms of carbon-carbon double bond in ketene N,O- acetals are more polarized and have far higher neucleophilicity than those of ketene O,O-acetals due to the stronger electron-donating property of the nitrogen atom compared to the oxygen atom. In this paper, we describe the novel polymerization method for polyamide, preparation of polyamide by the reactions of 2-methyl-2-oxazoline with polyisocyanate on the basis of the model reaction.