POLYESTER CONJUGATE FIBER FOR SLEEPING MAT AND SOLID FIBER FOR SLEEPING MAT

摘要

PROBLEM TO BE SOLVED: To obtain a polyester conjugate fiber for sleeping mat capable of providing good solid fiber performance and excellent in washing resistance and elasticity and its solid fiber. SOLUTION: This polyester conjugate fiber is obtained by eccentrically conjugating of the polythylene terephthalate or a polyester A consisting essentially of the polyethylene terephthalate with a polyethylene terephthalate-based copolymer polyester B in which 1-4.5 mol% isophthalic acid and 1-5 mol% ethylene oxide adduct of bisphenol A are copolymerized. The conjugate fiber has 3-9 mol total of copolymerization of isophthalic acid with bisphenol A ethylene oxide adduct and <=20% percentage of hollowness and 15-60% dry heat shrinkage factor at 170 deg.C and has latent crimp performance capable of developing 50-100 numbers/2.5 cm spiral crimp by free shrinkage heat treatment at 170 deg.C.