| 摘要 |
A poly(trimethylene terephthlate)filament yarn,which comprises 0.5 to 4.0 mass % of a fiber elongation improver particles being drawn and oriented in the longitudinal direction in the filament,having a heat distortion temperature of not lower than 40˚C and lower than 105˚C,having,in the cross section of the filament,an average particle diameter(D)of 0.03 to 0.35μm,and exhibiting a ratio(L/D)of an average particle length(L)in the longitudinal direction of the filament to the above average particle diameter(D)of 2 to 20.The filament yarn exhibits an increase percentage for a residual elongation of 30 % or more,which results from the presence of the fiber elongation improver,a double refractive index(Δn)of 0.02 to 0.07,a residual elongation of 60 to 250 % and a peak value of thermal stress of 0.18 cN/dtex or less,and thus can be produced by a high speed spinning and exhibits a high residual elongation and excellent draw twisting processability. |
