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US 4,359,557 AGranted
Process for producing low pilling textile fiber and product of the process
AssigneeEastman Kodak Company
InventorsKenneth R. Watkins, Leron R. Dean
Life of this patent
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Abstract
Process for manufacturing polyethylene terephthalate fibers having improved low-pilling properties by admixing ethylene glycol with polyethylene terephthalate polymer in extruder and holding the resulting processed fiber at constant length while heatsetting the fiber, and preferably relaxing the fiber up to about 5% while being heatset to a controlled length; and a polyester fiber as made by the process.
Claims16
A process for manufacturing polyethylene terephthalate fibers having improved low-pilling properties which comprise
- admixing in the feed throat of an extruder polyethylene terephthalate discrete solid polymer materials having an inherent viscosity of about 0.56 to about 0.60 with about 0.25% by weight ethylene glycol to form an admixture;
- melting in said extruder said solid polymer materials into a liquid and reacting said admixture to lower the inherent viscosity of said polyethylene terephthalate fibers to an inherent viscosity of about 0.39 to about 0.43, said inherent viscosity being determined by a concentration of 0.5% of the polymer in a solvent comprising 60% by weight phenol and 40% by weight tetrachloroethane, the polymer being dissolved at 125.degree. C. and being measured at 25.degree. C.;
- extruding the admixture into fibers;
- drafting the fibers;
- and
- heatsetting the fibers at a constant length.
3 more elements
Dependencies are inferred from the claim text.