| 摘要 |
Mechanically stable wet spun linear polyurethane are produced by extruding a linear polyurethane polymer solution to form a filament, passing the formed filament through at least one extraction bath to remove solvent therefrom at sufficiently high rate to effect a draw ratio of at least 1.1 and heating the extracted filament to a temperature above the second order of transition temperature and below the melting point of the linear polyurethane of the filament for a period sufficient to substantially completely relax the longitudinal stresses contained in the filament.
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