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US 5,183,614 AGranted
Method for producing X-ray detectable spandex fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorAllan R. Champion
Life of this patent
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Abstract
An X-ray detectable spandex fiber and a method for producing it from a segmented polyurethane polymer comprising finely divided X-ray detectable material such as barium sulfate.
Claims9
A process of producing an X-ray detectable spandex fiber comprising:
- a) dissolving a long chain synthetic polymer comprising at least 85% segmented polyurethane in an organic solvent to form a polymer spinning solution;
- b) blending a finely divided X-ray opaque filler material comprising an element of atomic number of at lest 20 into the polymer spinning solution before forming the fiber, wherein the amount of X-ray opaque filler material is at least 25% by weight of the total polymer and filler material;
- c) air gap spinning fibers from the polymer solution/X-ray opaque filler material blend;
- and
- d) passing the fibers through an aqueous bath.
2 more elements
Dependencies are inferred from the claim text.