Verfahren zum Vermindern der Konzentration an freien Carboxylgruppen in fadenbildenden linearen Terephthalsaeurepolyestern

摘要

An improvement in the process of preparing polyester filaments is disclosed as providing reinforced yarns and cords of polyester having low free-carboxyl-group contents which give superior performance in pneumatic tires and other reinforced rubber articles where heat-degradation is a problem. Reduction of free carboxyl groups is achieved by mixing with the molten polyester, prior to melt-spinning, 1,2-epoxy-3-phenoxypropane or 1,2-epoxy-3-n-hexyloxypropane.