Polypropylene nonwoven fabric and use thereof
A polypropylene based nonwoven fabric is excellent in surface appearance and stretch properties and exhibits a small residual strain and excellent adhesiveness to polyolefins. The nonwoven fabric is obtained by forming a polypropylene resin composition comprising 1 to 40 weight parts of (i) an isotactic polypropylene, and 60 to 99 weight parts of (ii) a propylene/ethylene/α-olefin copolymer obtained by copolymerizing 45 to 89 mole % of propylene, 10 to 25 mole % of ethylene and the balance of α-olefin having 4 to 20 carbon atoms (with the proviso that the copolymerized amount of the α-olefin having 4 to 20 carbon atoms does not exceed 30 mole %), characterized by a small residual strain after stretching at a stretch ratio of 150%. The nonwoven fabric can be effectively used as sanitary materials or the like by virtue of its characteristics including stretch properties.
1. A nonwoven fabric obtained by forming a mixture comprising
(I) a fiber obtained by producing a propylene based resin composition from
(i) 1 to 40 weight parts of an isotactic polypropylene and
(ii) 60 to 99 weight parts of a propylene/ethylene/α-olefin copolymer and spinning, and
(II) a fiber obtained by producing a resin other than the propylene based resin composition and spinning,
wherein said propylene/ethylene/α-olefin copolymer is obtained by copolymerizing 45 to 89 mole % of propylene, 10 to 25 mole % of ethylene and the balance of α-olefin having 4 to 20 carbon atoms, with the proviso that the copolymerized amount of the α-olefin having 4 to 20 carbon atoms does not exceed 30 mole %.
2. The nonwoven fabric according to claim 1 , wherein a residual strain of said nonwoven fabric after stretching at a stretch ratio of 150% is less than 50%.
3. The nonwoven fabric according to claim 1 , wherein said nonwoven fabric is a spunbonded nonwoven fabric.
4. The nonwoven fabric according to claim 1 , wherein said polypropylene resin composition forming the nonwoven fabric has a maximum peak of a melting point (Tm, ° C.) existing in a region of an endothermic curve of not less than 100° C., determined by a differential scanning calorimeter (DSC), and the heat of fusion in the maximum peak in the range of 5 to 40 J/g.
5. A sanitary material having the nonwoven fabric according to claim 1 .
6. A disposable diaper having the nonwoven fabric according to claim 1 .
7. A sanitary material having the nonwoven fabric according to claim 1 .
8. An absorbent article having the nonwoven fabric according to claim 1 .
9. A disposable face mask having the nonwoven fabric according to claim 1 .
10. An adhesive plaster having the nonwoven fabric according to claim 1 .
11. A patch having the nonwoven fabric according to claim 1 .
12. A disposable surgeon gown having the nonwoven fabric according to claim 1 .
13. A rescue gown having the nonwoven fabric according to claim 1 .
14. Various medical films or sheets having the nonwoven fabric according to claim 1 .
15. A sanitary material having the nonwoven fabric according to claim 4 .
16. A disposable diaper having the nonwoven fabric according to claim 4 .
17. A sanitary material having the nonwoven fabric according to claim 4 .
18. An absorbent article having the nonwoven fabric according to claim 4 .
19. A disposable face mask having the nonwoven fabric according to claim 4 .
20. An adhesive plaster having the nonwoven fabric according to claim 4 .
21. A patch having the nonwoven fabric according to claim 4 .
22. A disposable surgeon gown having the nonwoven fabric according to claim 4 .
23. A rescue gown having the nonwoven fabric according to claim 4 .
24. Various medical films or sheets having the nonwoven fabric according to claim 4 .