METHOD FOR PREPARING POLYESTER MULTIFILAMENT YARN FOR REINFORCEMENT OF RUBBER AND POLYESTER MULTIFILAMENT YARN PREPARED BY THE SAME METHOD

摘要

Disclosed is a method of producing a polyester multifilament yarn for reinforcing rubber, and a polyester multifilament yarn produced using the method. The method includes a) adding a polymerization catalyst containing 150 to 250 ppm of an antimony compound based on an antimony metal to a terephthalic acid (TPA) and ethylene glycol (EG) to perform poly¬ merization, b) solid state polymerizing a polymer obtained in step (a), c) melt spinning a solid state polymer obtained in step (b), d) winding melt spun filaments at a speed of 1500 m/min or more to produce an undrawn yarn having a density of 1.338 g/cm or more, and e) stretching the undrawn yarn obtained in step (d) to produce a polyester multifilament yarn that has intrinsic viscosity of 0.83 or more and tenacity of 8.3 g/d or more and includes 20 microequivalents/g or less of a carboxyl end group and 1.2 wt% or less of diethylene glycol. The polyester mul¬ tifilament yarn is useful as a rubber reinforcing material to produce a treated cord, such as a tire cord.