Stable breathable elastic garments
View Patent ↗A thermally stable microporous breathable film is provided comprising at least 35% filler, by weight of the filled-film, and a thermoplastic polymer blend of a first polyethylene polymer and a second polyethylene polymer. The first polyethylene polymer comprises 30%-70% by weight of the polymer blend and can have a density between about 0.86 g/cm 3 and 0.89 g/cm 3 and the second polyethylene polymer can have a density between about 0.90 g/cm 3 and 0.92 g/cm 3 . The filled-film can be uniaxially or biaxially oriented to form a microporous film and/or film laminate having good body conformance and which retains a high WVTR at 37° C. and above.
1. An absorbent bodily article, comprising:
a liquid pervious liner;
an absorbent core; and
a thermally stable film laminate comprising a breathable film and a fibrous layer wherein said absorbent core is positioned between said liquid pervious liner and said thermally stable film laminate;
said breathable film comprising an effective amount of filler and a thermoplastic polymer blend, said thermoplastic polymer blend comprising 30% to 70%, by weight, of a first ethylene polymer having a density below 0.89 g/cm 3 and 30% to 70%, by weight, of a second ethylene polymer having a density above about 0.90 g/cm 3 and wherein said film has voids adjacent said filler and further wherein said film has a WVTR of at least 300 g/m 2 /24 hours at 37° C. and said laminate has a heat shrinkage of less than less than 5% at 54° C.
2. The absorbent bodily article of claim 1 wherein said fibrous layer is an extensible nonwoven web.
3. The absorbent bodily article of claim 2 wherein said extensible nonwoven fabric comprises a necked nonwoven web.
4. The absorbent article of claim 3 wherein said extensible nonwoven fabric comprises a necked nonwoven web of polypropylene spunbond fibers.
5. The absorbent article of claim 2 wherein said extensible nonwoven web is an elastic nonwoven web.
6. The absorbent article of claim 1 wherein said thermoplastic polymer blend comprises about 60% to about 40%, by weight, of said first ethylene polymer.
7. The absorbent article of claim 6 wherein said second thermoplastic polymer comprises about 50%, by weight, of the second ethylene polymer.
8. The absorbent article of claim 6 wherein said breathable film has a WVTR in excess of 1500 g/m 2 /day at 37° C.
9. The absorbent article of claim 1 wherein the breathable film has a heat shrinkage of less than about 5% of 54° C.
10. The absorbent bodily article of claim 1 wherein said first ethylene polymer consists essentially of a copolymer of ethylene and an alpha-olefin and wherein said second ethylene polymer comprises a polyethylene polymer having a density between 0.90 g/cm 3 and about 0.92 g/cm 3 .
11. A thermally stable breathable film, comprising:
a microporous film comprising a thermoplastic polymer blend and a filler,
said thermoplastic polymer blend comprising a first ethylene polymer having a density below 0.89 g/cm 3 and a second ethylene polymer having a density above about 0.90 g/cm 3 and wherein said first ethylene polymer and said second ethylene polymer each comprise between 25% by weight and 75% by weight of said thermoplastic polymer blend;
said filler comprising at least 35% by weight of said microporous film; and
wherein said microporous film has voids adjacent said filler and further wherein said film has a WVTR of at least 300 g/m 2 /24 hours at 37° C. and less than 15% heat shrinkage at 37° C.
12. The thermally stable film of claim 11 wherein said film has a percent heat shrinkage of less than 10% at 37° C.
13. The thermally stable breathable film of claim 12 wherein said film has a WVTR in excess of 800 g/m 2 /day at 37° C.
14. The thermally stable film of claim 11 wherein said film has a WVTR in excess of 1500 g/m 2 /day at 37° C.
15. The thermally stable film of claim 14 wherein said film has a percent heat shrinkage less than about 5% at 54° C.
16. The thermally stable film of claim 11 wherein said first ethylene polymer has a density between about 0.89 g/cm 3 and about 0.86 g/cm 3 .
17. The thermally stable film of claim 11 wherein said filler comprises at least about 50% by weight of said film.
18. The thermally stable film of claim 17 wherein said film has a WVTR in excess of 800 g/m 2 /day at 37° C.
19. The thermally stable film of claim 18 wherein said film has a heat shrinkage less than 10% at 54° C.
20. The thermally stable film of claim 18 wherein said second ethylene polymer comprises a polyethylene polymer having a density between 0.90 g/cm 3 and about 0.92 g/cm 3 .
21. The thermally stable film of claim 20 wherein said first ethylene polymer consists essentially of a copolymer of ethylene and an alpha-olefin.
22. The thermally stable film of claim 11 wherein said first ethylene polymer comprises from about 40% to about 60% by weight of said thermoplastic polymer blend.
23. The thermally stable film of claim 11 wherein said first ethylene polymer comprises about 50% by weight of said thermoplastic polymer blend.
24. A thermally stable film laminate, comprising:
a thermally stable film of claim 11 ; and
a fibrous layer bonded to said laminate wherein said laminate has a shrinkage less than 5% at 54° C.
25. The thermally stable film laminate of claim 24 wherein said laminate has a shrinkage of less than about 1% of 54° C.
26. The thermally stable film laminate of claim 25 wherein said first ethylene polymer and second ethylene polymer each comprise about 50%, by weight, of the thermoplastic polymer blend.
27. The thermally stable film laminate of claim 24 wherein said laminate has a WVTR in excess of 2000 g/m 2 /24 hours.
28. The thermally stable film laminate of claim 27 wherein said first ethylene polymer comprises from about 40% to about 60% by weight of said thermoplastic polymer blend.
29. The thermally stable film laminate of claim 24 wherein said first ethylene polymer comprises from 30% to 70% by weight of said thermoplastic polymer blend.
30. The thermally stable film laminate of claim 24 wherein said fibrous layer comprises a nonwoven web.
31. The thermally stable film laminate of claim 30 wherein said fibrous layer comprises an extensible nonwoven web.
32. The thermally stable film laminate of claim 31 wherein said fibrous layer comprises a necked nonwoven web.
33. The thermally stable film laminate of claim 24 wherein said laminate has a WVTR in excess of 800 g/m 2 /24 hours at 37° C. and further wherein said second ethylene polymer comprises a polyethylene polymer having a density between 0.90 g/cm 3 and about 0.92 g/cm 3 .
34. The thermally stable film laminate of claim 33 wherein said first ethylene polymer consists essentially of a copolymer of ethylene and an alpha-olefin.