Nonwoven fabric layered body, stretchable nonwoven fabric layered body, fiber product, absorbent article, and sanitary mask

1. A nonwoven fabric layered body, comprising:

an elastic nonwoven fabric; and

an extensible spunbond nonwoven fabric that is disposed on at least one surface side of the elastic nonwoven fabric and that has a degree of maximum load elongation of 50% or more in at least one direction,

the nonwoven fabric layered body satisfying the following (1) and (2):

(1) the elastic nonwoven fabric comprises a resin composition containing a low-crystalline polypropylene satisfying the following (a) to (f), and an α-olefin copolymer A containing constitutional units derived from ethylene, propylene and butene, and having a melting point of 150° C. or more and a crystallization degree of 8% or less, and

(2) the resin composition contains from 5 parts by mass to 50 parts by mass of the α-olefin copolymer A with respect to 100 parts by mass of the resin composition:

(a) [mmmm]=20 to 60 mol %

(b) [rrrr]/(1−[mmmm])≤0.1

(c) [rmrm]>2.5 mol %

(d) [mm]×[rr]/[mr] 2 ≤2.0

(e) weight average molecular weight (Mw)=10,000 to 200,000

(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, and [mm], [rr] and [mr] each represent a triad fraction.

2. The nonwoven fabric layered body according to claim 1 , wherein the resin composition contains from 95 parts by mass to 50 parts by mass of the low-crystalline polypropylene with respect to 100 parts by mass of the resin composition.

3. The nonwoven fabric layered body according to claim 1 , wherein the α-olefin copolymer A has a tensile elastic modulus of 100 MPa or less.

4. The nonwoven fabric layered body according to claim 1 , wherein the extensible spunbond nonwoven fabric is disposed on both surface sides of the elastic nonwoven fabric.

5. The nonwoven fabric layered body according to claim 1 , wherein the elastic nonwoven fabric is a nonwoven fabric obtained by a spunbond method.

6. The nonwoven fabric layered body according to claim 1 , wherein the extensible spunbond nonwoven fabric is an extensible spunbond nonwoven fabric comprising a concentric core-sheath-type composite fiber comprising, as a core portion, a low-MFR propylene-based polymer having an MFR in a range of from 1 g/10 minutes to 200 g/10 minutes and, as a sheath portion, a high-MFR propylene-based polymer having an MFR in a range of from 16 g/10 minutes to 215 g/10 minutes, and wherein a difference in MFR between the low-MFR propylene-based polymer and the high-MFR propylene-based polymer is 15 g/10 minutes or more, wherein MFR is referred to as melt flow rate.

7. The nonwoven fabric layered body according to claim 1 , wherein the extensible spunbond nonwoven fabric comprises an olefin-based polymer composition containing from 80% by mass to 99% by mass of a crystalline propylene-based polymer and from 1% by mass to 20% by mass of a high-density polyethylene.

8. The nonwoven fabric layered body according to claim 1 , wherein a weight-per-area ratio of the elastic nonwoven fabric and the extensible spunbond nonwoven fabric (elastic nonwoven fabric: extensible spunbond nonwoven fabric) is in a range of from 10:90 to 90:10.

9. A stretchable nonwoven fabric layered body, obtained by drawing the nonwoven fabric layered body according to claim 1 .

10. A fiber product, comprising the nonwoven fabric layered body according to claim 1 .

11. An absorbent article, comprising the nonwoven fabric layered body according to claim 1 .

12. A sanitary mask, comprising the nonwoven fabric layered body according to claim 1 .

13. A fiber product, comprising the stretchable nonwoven fabric layered body according to claim 9 .

14. An absorbent article, comprising the stretchable nonwoven fabric layered body according to claim 9 .

15. A sanitary mask, comprising the stretchable nonwoven fabric layered body according to claim 9 .