GB615884A - Improvements in or relating to the manufacture of linear nitrogen-containing polymers - Google Patents

Abstract

Linear polymers of high molecular weight are prepared by reacting a bis chloroformic ester of a glycol with a compound containing as sole reactive radicals two amino groups until the product has film-forming properties. For products of particularly high molecular weight suitable for example for filaments, equivalent proportions of the reactants are used. The bis chloroformic ester may be prepared by treating with carbonyl chloride, a glycol, e.g. ethylene glycol, di-, tri-, tetra- or penta-methylene glycol, or di- or tri-ethylene glycol. Suitable diamines are ethylene and propylene diamine, 1-3-diamino propane, pentamethylene and hexamethylene diamine, 2-5-diamino hexane and phenylene diamines. Reaction may be at normal temperature or heat may be applied especially in the later stages of the reaction. Completion of the reaction may be assisted by reduction of the pressure or by the presence of alkaline materials. Solvent or diluent may be present and may be distilled off in the later reaction stages. Reaction at elevated temperature is preferably performed in nonoxidising atmosphere, e.g. nitrogen. The products may be formed into filaments or films, if desired, with the aid of plasticisers. These materials may be stretched in known manner.