| 摘要 |
A POLYESTER FILAMENTARY YARN HAVING A NOVEL INTERNAL MICROSTRUCTURE, A POLYESTER TIRE CORD PRODUCED FROM THE YARN AND A PROCESS FOR PRODUCTION THEREOF ARE PROVIDED. THE POLYESTER YARN OF THE PRESENT INVENTION COMPRISING AT LEAST 90 MOL% POLYETHYLENE TEREPHTHALATE AND HAVING A FINENESS OF 3 TO 5 DENIER PER FILAMENT WHEREIN SAID YARN SATISFIES THE FOLLOWING I )—III) CHARACTERISTICS, AFTER IT HAS BEEN TREATED FOR 3 MINUTES AT TEMPERATURE OF 240°C, TENSION OF 0.1 G/D, SAID YARN SATISFIES THE FOLLOWING IV) VII) VARIATIONS OF MICROSTRUCTURAL PHYSICAL PROPERTIES: I ) A DENSITY OF 1.38—1.39 G/CM, I) A BIREFRINGENCE INDEX IN AMORPHOUS PORTIONS OF 0.06—0.O9, III) TANδPEAK TEMPERATURE OF 140°C AND BELOW, IV) THE INCREMENT OF AN PERCENT CRYSTALLINITY(ΔX)OF 10-20 WT%, V) THE DECREMENT OF AN AMORPHOUS ORIENTATION COEFFICIENT(ΔF) OF AT LEAST 0.05, VI) THE INCREMENT OF A LONG PERIOD VALUE(ΔLP) OF AT LEAST 10 A, AND VII) THE DECREMENT OF TANδPEAK TEMPERATURE(ΔTANΔpeak) OF AT LEAST 5°C. THE FILAMENTARY YARN IS DIPPED IN A RUBBER SOLUTION TO PRODUCE A TIRE CORD WHICH EXHIBITS EXCELLENT DIMENSIONAL STABILITY AND FATIGUE RESISTANCE WHEN IT HAS BEEN INCORPORATED IN A RUBBER MATRIX OF A TIRE. |
