| 摘要 |
PURPOSE:To improve dyeability and strength of totally aromatic polyamide yarn, by spinning the totally aromatic polyamide having a repeating unit mostly consisting of 4-methyl-1,3-phenylene isophthalamide and/or 6-methyl-1,3-phenylene isophthalamide, and drawing it under a specific condition. CONSTITUTION:A totally aromatic polyamide having a repeating unit comprising >=95mol% 4-methyl-1,3-phenylene isophthalamide and/or 6-methyl-1,3-phenylene isophthalamide is dissolved in N,N'-dimethl-alkylurea solvent shown by the formula (n is 2 to 3 integer) and spun into a hot air flow. The spun yarn is drawn in mixture (5-40wt% solvent concentration) of the solvent and water at 40-80 deg.C at >=3 draw ratio, immersed in the similar mixture at >=90 deg.C-<= the boiling point of the mixture and crystallized. The titled yarn having high strength and high crystallizability and improved dyeability is obtained.
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