| 摘要 |
PURPOSE:To obtain the titled fiber having improved flexural resistance and high strength and modulus, by carrying out the flow-drawing of an undrawn yarn of an aromatic polyamide in an inert gas atmosphere at a high temperature higher than a specific temperature, at a high drawing ratio. CONSTITUTION:The objective fiber can be manufactured by the flow-drawing of an undrawn yarn of an aromatic polyamide in an inert gas atmosphere at >=300 deg.C and at a high drawing ratio. The aromatic polyamide fiber is preferably the one having the recurring unit of formula I [R1 and R2 are H or lower alkyl; Ar1 and Ar2 are aromatic residue of formulas II-V (X is O, CO, S or SO2), etc. which may be substituted with halogen and/or lower alkyl] and/or formula VI(R3 is same as R1 and Ar3 is same as Ar1).
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