Process for producing ultra-high-tenacity polyvinyl alcohol fiber
First Claim
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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Abstract
An ultra-high-tenacity multifilament fiber of polyvinyl alcohol having a degree of polymerization of at least 1500, said filament having a tensile strength of at least 12 g/d and an initial modulus greater than 280 g/d, which is produced by 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, dry-spinning the resulting polymer solution through a spinneret into an environment of air or inert gas, introducing the dry-spun filaments into a coagulating bath, and drawing the coagulated filaments at a total effective draw ratio of at least 20 times.
30 Citations
4 Claims
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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;
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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. - View Dependent Claims (2, 3, 4)
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Specification