PARTIALLY ORIENTED UNDRAWN POLYESTER YARN AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a partially oriented undrawn polyester yarn having remarkably improved spinnability, draw ratio and productivity while suppressing the orientation in the spinning process. SOLUTION: The partially oriented undrawn polyester yarn is composed of a copolyester copolymerized with a polyalkylene glycol and a polyfunctional molecule having >=3 ester-forming functional groups in one molecule and has a birefringence of 0.015-0.060.