PURPOSE: To obtain the subject fiber, having the innermost and outermost layers respectively composed of polyester ether and polyamide and a dispersion mixture of both as an interlayer and excellent in high strength, high modulus, dimensional stability, etc.
CONSTITUTION: The objective fiber, composed of three layers of (A) the innermost layer, composed of a polyester ether consisting essentially of poly(ethylene-1,2-diphenoxyethane-p,p'-dicarboxylate) having ≥0.7 intrinsic viscosity [η], ≥170×10-3 birefringence (n) and ≥1.365g/cm3 density and accounting for 30-90wt.% of the objective fiber, (B) the outermost layer composed of a polyamide having ≥2.8 relative viscosity (ηr) in sulfuric acid, ≥45×10-3 birefringence (n) and ≥1.135g/cm3 density and (C) a dispersion mixture obtained by dispersing and mixing the components (A) with (B) at (30/70)-(70/30) weight ratio and having ≥6.0g/d strength, ≤20% elongation, ≥90g/d initial resistance to stretching and ≤5% dry heat shrinkage factor at 150°C.
SATO TAKUJI
NAKANO KENJI
