| 摘要 |
PURPOSE: To obtain the filament suitable for reinforcing plastics having high strength and high modulus by extruding a soln. of superhigh molecular polyethylene into a spinning duct under specified conditions and drawing off the product without stretching. CONSTITUTION: (A) A polyethylene with a molecular weight Mw of >=1×10<6> and (B) a solvent (such as paraffin oil) are mixed to obtain a 1-6 wt.% soln. It is extruded into a spinning duct at an extrusion temp. Tg=180-250 deg.C at an extrusion rate Vg=5-150 m/min through a spinning nozzle having nozzle aperture of diminishing cross sections toward the nozzle exit side, wherein the duct is kept at 100-250 deg.C. Gas is blown on filaments below the heating section. Filaments are drawn at a rate Vw of >=500 m/min. Further, the solvent is removed without stretching, the filaments to obtain the objective filaments.
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