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Propylene polymer fibers and yarns

  • US 5,945,215 A
  • Filed: 09/12/1997
  • Issued: 08/31/1999
  • Est. Priority Date: 09/16/1996
  • Status: Expired due to Fees
First Claim
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1. Fiber comprising propylene polymer and having an Apparent Average Microfibril Diameter of at least 240 Å

  • , wherein the Apparent Average Microfibril Diameter is a value calculated from small angle X-ray diffraction measurements, with the fiber positioned such that its longitudinal axis is perpendicular to the X-ray beam and with the fiber positioned such that its longitudinal axis is disposed at an angle, α

    , from the perpendicular to the X-ray beam, as an average of ##EQU5## at the angles, α

    , of 10° and

    20°

    , and wherein Im (0) is maximum intensity of the small angle X-ray meridional reflection with the fiber positioned such that its longitudinal axis is perpendicular to the X-ray beam,Im

    ) is maximum intensity of the small angle X-ray meridional reflection with the fiber positioned such that its longitudinal axis is inclined at the angle, α

    , from the perpendicular to the X-ray beam, ##EQU6## and .sub.φ

    m is an angular position, in radians, of the center of the small angle X-ray meridional reflection at half height relative to the center of the incident X-ray beam with the fiber positioned such that its longitudinal axis is perpendicular to the X-ray beam,and wherein the small angle X-ray diffraction is conducted with CuKα

    radiation having a wavelength of 1.5418 Å and

    the X-ray beam is slit collimated to an angular width at half height of 1.81 minutes.

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