POLYESTERFASER MIT AUSGEZEICHNETER VERARBEITBARKEIT UND VERFAHREN ZUR HERSTELLUNG DERSELBEN

摘要

A polyester fiber comprising 90% or more by weight of a poly(trimethylene terephthalate), and showing a peak value of a thermal stress of 0.1 to 0.35 g/d, a boil-off shrinkage of 5 to 16%, a tenacity of 3 g/d or more, an elongation of 20 to 60%, a relationship between an elastic modulus Q (g/d) and an elastic recovery R (%) satisfying the formula (1), and a peak temperature of a loss tangent of 90 to 120 DEG C: $The\; polyester\; fiber\; of\; the\; present\; invention\; is\; a\; poly(trimethylene\; terephthalate)\; fiber\; which\; has\; an\; elongation,\; a\; thermal\; stress\; and\; a\; boil-off\; shrinkage\; in\; appropriate\; ranges,\; and\; the\; woven\; or\; knitted\; fabric\; prepared\; therefrom\; shows\; inhibition\; of\; an\; excessive\; thermal\; shrinkage\; during\; processing\; and\; manifests\; a\; low\; elastic\; modulus\; and\; a\; soft\; hand\; touch.\; Accordingly,\; the\; polyester\; fiber\; of\; the\; present\; invention\; is\; suitable\; for\; use\; in\; innerwear,\; outerwear,\; sportswear,\; legwear,\; lining\; cloths,\; swimwear\; and\; the\; like.\; In\; addition,\; the\; polyester\; fiber\; can\; be\; stably\; manufactured\; in\; high\; productivity\; by\; a\; process\; in\; which\; spinning\; and\; drawing\; are\; consecutively\; conducted\; to\; prevent\; the\; undrawn\; yarn\; from\; aging.\mathop{\mathrm{image}}$