| 摘要 |
PCT No. PCT/KR96/00248 Sec. 371 Date Aug. 29, 1997 Sec. 102(e) Date Aug. 29, 1997 PCT Filed Dec. 26, 1996 PCT Pub. No. WO97/24478 PCT Pub. Date Jul. 10, 1997A 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) DIFFERENCE iii) characteristics, after it has been treated for 3 minutes at temperature of 240 DEG 0 C., tension of 0.1 g/d, said yarn satisfies the following iv) DIFFERENCE vii) variations of mircrostructural physical properties: i) a density of 1.38 DIFFERENCE 1.39 g/cm3, ii) a birefringence index in amorphous portions of 0.06 DIFFERENCE 0.09, iii) tan delta peak temperature of 140 DEG C. and below, iv) the increment of a percent crystallinity ( DELTA Xc) of 10 DIFFERENCE 20 wt. %, v) the decrement of an amorphous orientation coefficient ( DELTA Fa) of at least 0.05, vi) the increment of a long period value ( DELTA LP) of at least 10 ANGSTROM , and vii) the decrement to tan delta peak temperature ( DELTA tan delta peak) of at least 5 DEG C. The filamentary yam 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. |
