Abstract: The present invention relates to quaternary .beta.-hydroxy-alkyl-ammonium halides and quaternary .beta.-hydroxy-cycloalkylammonium halides, which are liquid at temperatures lower than 60.degree. C., are easily and rapidly miscible in liquid epoxides, as well as in liquid poly-isocianates, generating liquid compositions which spontaneously polymerize, with fast polymerization rate, already at temperatures comprised within the range of from 0.degree. C. to 60.degree. C., yielding a solid, insoluble polymeric material endowed with very high values of softening temperature.

Abstract: A reactive composition, rapidly polymerizable already starting from room temperature, comprises a liquid mixture consituted by at least one organic polyisocyanate, at least one compound containing one or more epoxy groups and a liquid catalyst constituted by, or containing, at least one compound falling within the scope of the general formula ##STR1## in which the substituents have the meanings reported in the following; the compound which contains the epoxy group(s) can be constituted by the catalyst only.Such a composition can turn into a polymeric material having softening temperatures as high as 300.degree. C. and even higher.