Propylene polymer fibers (the crystalline microstructure of which is characterised by X-ray crystal diffraction) and yarns and textile products (e.g. carpet) thereof

摘要

A fiber comprising propylene polymer and characterized by small angle X-ray diffraction such that an average of (formula (I)) with the fiber positioned such that its longitudinal axis is inclined at angles, a, of 10o and 20o from a perpendicular to the X-ray beam is at least about 240 angstroms, wherein Im(0) is maximum intensity of the small angle X-ray meridianal reflection with the fiber positioned such that its longitudinal axis is perpendicular to the X-ray beam; Im(a) is maximum intensity of the small angle X-ray meridianal reflection with the fiber positioned such that the longitudinal axis is inclined at the angle, a, from the perpendicular to the X-ray beam; L is as defined in formula (II) Fm is an angular position, in radians, of the center of the small angle X-ray meridianal 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. The small angle X-ray diffraction is conducted with CuKa radiation having a wavelength of 1.5418 angstroms and the X-ray beam is slit collimated to an angular width at half height of 1.81 minutes. Also described are yarns and textile products comprising the fibers described above.