CPC D04H 1/5416 (2020.05) [D04H 1/4291 (2013.01); D04H 1/56 (2013.01); D04H 3/007 (2013.01); D04H 3/16 (2013.01)] | 11 Claims |
1. A spunbonded non-woven fabric, comprising a fiber comprising: a propylene homopolymer having a melting point of 140° C. or more; a polyethylene having a density of from 0.941 g/cm3 to 0.970 g/cm3; and at least one polymer selected from the group consisting of a polymer specified in the following (I) and a polymer specified in the following (II),
wherein the fiber comprises a sea-island structure, and a percentage of an island phase having a diameter of from 0.12 μm to less than 0.63 μm with respect to an entire island phase in a cross section orthogonal to an axis direction of the fiber on a number basis is 30% or more:
(I) a random copolymer of propylene and at least one selected from ethylene or an α-olefin having a carbon number of from 4 to 20, and
(II) a propylene homopolymer with a melting point of less than 120° C., satisfying the following (a) to (f):
(a) [mmmm]=from 20% by mol to 60% by mol,
(b) [rrrr]/(1−[mmmm])≤0.1,
(c) [rmrm]>2.5% by mol,
(d) [mm]×[rr]/[mr]2≤2.0,
(e) weight-average molecular weight (Mw)=from 10,000 to 200,000, and
(f) molecular weight distribution (Mw/Mn)<4,
wherein, in (a) to (d), [mmmm] represents a meso-pentad fraction, [rrrr] represents a racemic pentad fraction, [rmrm] represents a racemic meso-racemic meso-pentad fraction, each of [mm], [rr], and [mr] represents a triad fraction, and Mn represents a number-average molecular weight.
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