POLYESTER YARNS PRODUCED BY HIGH SPEED MELT-SPINNING PROCESSES

摘要

A spun polyester yarn containing ethylene terephthalate as the main or only recurring unit characterized by a percentage crystallinity ( beta x102) of less than 20, a birefringence ( DELTA n) of at least 50x10-3, a function A greater than 28 and a function B>/=16 where and B=(A-100 beta ) and wherein-IV is the intrinsic viscosity of the spun yarn, DELTA n is the birefringence of the spun yarn and (dpf) is the filament decitex of the spun yarn.