| 摘要 |
PROBLEM TO BE SOLVED: To obtain high-shrinkage polyester staple fibers which give bulky woven fabric of high light fastness, swelling feel and soft touch by treating drawn yarns of a specific copolyester with heat under specific conditions. SOLUTION: Copolyester drawn fibers which contain isophthalic acid and 2,2-bis 4-(2-hydroxyethoxy)phenyl}propane as copolymerization components, simultaneously satisfy formulas I-III [p(a) is the molar fraction of isophthalic acid based on the whole acids in %; p(b) is the molar fraction of 2,2-bis 4-(2- hydroxyethoxy)phenyl}propane], have an intrinsic viscosity of >=0.52, a crystallinity of 15-30%, an optical birefrigence of 100×10<-3> -145×10<-3> and a shrinkage stress of >=150mg/d, are heat treated at 120-180 deg.C under -2-+5% relaxation for >=2 seconds whereby high-shrinkage polyester staple fibers are obtained with a boiling water shrinkage of <=20%, a dry heat shrinkage of 12-40% at 160 deg.C after treatment with boiling water, a dry heat shrinkage of 15-45% at 180 deg.C after treatment with boiling water, a change rate of <=15% with the lapse of time and a deformation rate >=1.2.
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