| abstract |
The present invention relates to polypropylene fibers and fabrics comprising polypropylene fibers. The fibers comprise a propylene polymer comprising at least 50 mol% propylene. A) a melt flow rate (MFR, ASTM 1238, 230 DEG C, 2.16 kg) of from about 10 dg / min to 25 dg / min; b) a dimensionless stress ratio / loss tangent R 2 at 190 ° C of about 1.5 to 30, defined by equation (8); c) a crystallization initiation temperature, T c, rheol, (190 ° C, determined by SAOS rheology at 1 ° C / min, the polymer having a 0 wt% crystallization agent) under a flowing flow of at least about 123 ° C; d) an average mesuron as determined by < 13 > C NMR of at least about 55; And e) optionally, a loss tangent, tan [delta] (defined by equation (2)) at an angular frequency of about 14 to 70 at 190 DEG C of 0.1 rad / s. |