Reactive composition containing several constituents, polymers prepared therefrom and their applications

摘要

1. Process for the manufacture of polyamide base moulded objects by injection and/or moulding reaction consisting in mixing two constituents of a liquid reactive composition before injection and/or moulding, characterised in that one of the constituents is a difunctional oligomer or a polyamide of a molecular mass comprised between 300 and 6000, the functional groups of which are selected from amines and carboxylic acids, and in that the second constituent is a polyisocyanate having a viscosity in the molten state below 10 Pa.s (10,000 cps) at 170 degrees C, said constituents being present in the molten state at a temperature comprised between 120 and 300 degrees C and in proportions such that the molar ratio NCO/NH2 or COOH is comprised between 0.75 and 1.