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Process for producing ultra-high-tenacity polyvinyl alcohol fiber

  • US 4,698,194 A
  • Filed: 03/12/1986
  • Issued: 10/06/1987
  • Est. Priority Date: 12/12/1983
  • Status: Expired due to Term
First Claim
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1. A process for producing an ultra-high-tenacity polyvinyl alcohol fiber which comprises the steps of dissolving polyvinyl alcohol having a degree of polymerization of at least 1500 in a solvent, extruding the resulting polymer solution from a spinneret through a layer of air or inert gas into a coagulating bath wherein the polymer solidifies to form coagulated filaments, and drawing the coagulated filaments at a total effective draw ratio of at least 20 times;

  • said solvent being at least one member selected from the group consisting of dimethyl sulfoxide, glycerin, ethylene glycol, diethylene triamine, and ethylene diamine, said polymer solution having a viscosity of 100 to 5000 poise as measured when it emerges from the spinnerette; and

    said coagulating bath being a liquid selected from the group consisting of methanol, ethanol, butanol, acetone, benzene, toluene, mixtures thereof with dimethyl sulfoxide, and saturated solutions of inorganic salts.

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