| 摘要 |
PURPOSE:To obtain the titled filament yarn consisting of high-molecular nylon 6, by dissolving nylon 6 polymer having a specific relative viscosity and molecular weight distribution value in formic acid, etc., extruding the resultant solution through an orifice, coagulating the resultant filaments in a coagulation bath, and winding the coagulated filament yarn. CONSTITUTION:Nylon 6 polymer having >=5.0 relative viscosity (measured by using a 1.0g/dl solution in concentrated sulfuric acid at 20 deg.C) and <=6.5 molecular weight distribution value (MW/Mn) is dissolved in formic acid or an aqueous solution thereof to form a spinning solution, which is then extruded through an orifice, introduced into a coagulation bath and coagulated to give a filament yarn. The resultant filament yarn is then continuously or once wound and hot-drawn to afford the aimed filament yarn. Preferably, the aqueous solution of the formic acid contains >=80wt% formic acid, and the nylon 6 filament yarn is hot-drawn at >=5 times draw ratio.
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