| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester based conjugated fiber and a method manufacturing the same having high durability of stretch properties excellent in stretch properties and durability of the stretch properties by forming a side by side type conjugated fiber using PTT(polytetramethylene terephthalate) and PBT (polybutylene terephthalate) and setting the intrinsic viscosity of the both components in a proper relation and elongation rate of crimps, elongation rate of stretching and stretch modulus of elongation in adequate ranges. SOLUTION: This side by side type polyester based conjugated fiber obtained by conjugating polyesters having different viscosities in a conjugating ratio of 65:35-35:65, comprises component A including PTT as main a constituent and component B including PBT as a main constituent, and the intrinsic viscosities of the component A and B satisfies the formula (Y) and the fiber has the following characters; elongation rate of crimp <=20%, elongation rate of stretching >=10%;, stretch modulus of elongation >=90% and Uster irregularity <=2.0%. Formula (Y): 1.5<=Ia/Ib<=2.5 (Ia is the intrinsic viscosity of the component A, Ib is the intrinsic viscosity of the component B).
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