ES322873A3 - Procedure for the obtaining of elastomeric filaments of segmented linear polymers. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Process for obtaining elastomeric filaments of segmented linear polymers, having an elastic recovery above about 90%, a voltage drop below about 20%, and an essentially linear polymer structure, characterized by reacting a finished dysfunctional polyether in hydroxyl, of molecular weight above about 600 and a melting point below about 50º C, with an organic diisocyanate in a molar ratio of greater than 1: 1, to produce a low molecular weight polymer with terminal hydroxyl groups; reacting the finished hydroxyl product with at least 2 moles of an organic diisocyanate to produce an isocyanate-terminated polymer, and then reacting the resulting isocyanate-terminated polymer with an essentially stoichiometric amount of a diprimary amine to give a product final having a polymer melting temperature above 150º C and an inherent viscosity of at least 1, measured in a solution of hexamethylphosphamide, of a concentration of 0.5 g of said final product per 100 ml of solution; said diisocyanate and said diprimary diamine being complementary monomers capable of forming a linear urea polymer, with a melting point above 200º C in the molecular weight range above 5000, said low molecular weight polymer being present in the final product in a proportion of from about 60% about 90% by weight; and forming said filaments by extruding said final product through holes. (Machine-translation by Google Translate, not legally binding)