Patent ID: 8105521
Filing Date: 2012-01-31
Classification: D01F,Y10T

Abstract:
1. A method of manufacturing a wholly aromatic polyamide filament, comprising: dissolving a wholly aromatic polyamide polymer in a concentrated sulfuric acid solvent to prepare a spinning liquid dope, wherein the wholly aromatic polyamide polymer is obtained by polymerizing an aromatic diamine and an aromatic diacid chloride in a polymerization solvent containing N-methyl-2-pyrrolidone; spinning the liquid dope through spinnerets to give a spun material, passing the spun material through a non-coagulation fluid layer to form the wholly aromatic polyamide filament; and feeding said aromatic diamine dissolved in the polymerization solvent and said aromatic diacid chloride into a polymerization reactor through a multiple tubular feed pipe having an inner path and an outer path, wherein one of (1) said aromatic diamine dissolved in the polymerization solvent and (2) said aromatic diacid chloride is fed through said inner path, and the other of (1) and (2) is fed through said outer path, wherein said inner path and said outer path are concentric, and wherein the formed wholly aromatic polyamide filament has a polydispersity index PDI ranges from 1.5 to 2.3.