公开(公告)号：US11180607B2

公开(公告)日：2021-11-23

申请号：US16709602

申请日：2019-12-10

Applicant: CHANG CHUN PLASTICS CO., LTD.

Inventor： Bo-Fan Xue ,  Tsai-Pang Huang ,  Yung-Sheng Lin

IPC: C08G63/183 ,  D01D5/098 ,  D01F6/62 ,  D04H1/435

Abstract: A polyester with ultra-high flowability and good stability over time is provided. The polyester can be polybutylene terephthalate (PBT) or another aliphatic polyester, whose intrinsic viscosity (IV) is less than 0.6 dL/g and a carboxylic end group (CEG) content is 15 meq/kg or less, and characterized by having a melt volume rate (MVR) of greater than 400 cm3/10 min at 250° C. A resin composition of this polyester is provided, which can be meltblown into microfibers of a uniform diameter and a concentrated diameter distribution, forming a fabric with a uniform small pore size.