| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide fine fineness polyethylene naphthalate undrawn yarns having an excellent binder performance and fine fineness polyethylene naphthalate oriented yarns of an unconventional level in order to achieve a staple fiber nonwoven fabric substantially formed of polyethylene naphthalate alone and having excellent heat resistance and a large strength. <P>SOLUTION: Undrawn polyethylene naphthalate fibers has a birefringence of 0.015 to 0.040 and an intrinsic viscosity of 0.35 to 0.47 dL/g, and drawn polyethylene naphthalate fibers obtained by drawing the undrawn polyethylene naphthalate yarns has a birefringence of 0.30 to 0.40, a dry heat shrinkage percentage of -5.0 to 5.0% at 180°C, an intrinsic viscosity of 0.35 to 0.47 dL/g, and a fineness of 0.5 to 1.7 dtex. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
