Back to results
US 5,962,130 AGranted
Durable polyurethane fiber and method for the manufacture thereof
AssigneeDuPont-Toray Co. Ltd.
InventorsMasao Umezawa, Tsutomu Wanatabe, Hideki Nakanishi
Life of this patent
Estimating the term…
Abstract
A durable dry-spun, polyurethane fiber exhibits a small angle X-ray scattering pattern that forms a layer line scattering image or an eyebrow-shaped four dot scattering image. The fiber is particularly useful in pantyhose, undergarments and the like.
Claims1
A durable polyurethane fiber, the polyurethane having a structural formula
- --(P--U--R.sup.1 --U--)n.sub.1 --(R.sup.2 --U--R.sup.3 --U--)n.sub.2(I)
- wherein P is a polyol residue, R.sup.1 and R.sup.3 are the same or different diisocyanate residues, R.sup.2 is a diol residue, U is a urethane bond, and n.sub.1 and n.sub.2 are each the number of repeating units, the number being in the range of 1 to 10, wherein
- the fiber exhibits a small angle X-ray scattering image having a long period in the direction of the meridian of 7 to 16 nanometers, and wherein
- the image is an eyebrow-shaped four dot scattering image which has a long period in the direction of the equator of 13 to 30 nm or the image of layer line dots, wherein the fiber fineness is in the range of 3.3 to 33 dtex and wherein the fiber is incorporated into an undergarment.
1 more element
Dependencies are inferred from the claim text.