Tire Cord Application of High-Modulus Fibers Derived from Polyamide-Hydrazides

Abstract

Abstract Recent developments in tire design have focused interest on new combinations of properties for fibers to be used in tire cords. Different fiber properties are of importance depending on whether the end use is in bias design, breaker belts, or radial design. X-500 class fibers of polyamide-hydrazides can be produced with a range of property combinations. The textile-like fiber with good tenacity, extensibility, and modulus similar to presently used organic fibers has advantages of greater dimensional stability and heat resistance. The high modulus variant shows better flex life, abrasion resistance, and water resistance than glass. X-500 class fibers can be made stronger and stiffer than glass or steel—when compared in textile units. Data, presented show typical prototype X-500 tire cord properties in the greige and the heat-treated form. Experimental tires were made using a polyamide-hydrazide X-500 fiber in the belts of radial and bias constructions. Nylon 66 and polyester were used in the carca...