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1. (WO2015175593) FILM THERMOPLASTIQUE MINCE, MICROPOREUX ET PERMÉABLE À L'AIR
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

WHAT IS CLAIMED IS:

1. A breathable, thermoplastic film having a basis weight less than or equal to about 15 gsm and a water vapor transmission rate of at least about 500 grams H20/24-hour/m2; wherein said film has a ratio of the MD load at break to the CD load at break of less than about 10, and at least one of a machine-direction notched Elmendorf tear strength of at least about 5 g or a machine-direction notched trapezoidal tear strength of at least about 15 g.

2. The film according to claim 1, wherein the MD load at break is at least about 2.0 N/cm and the CD load at break is at least about 0.7 N/cm.

3. The film according to claim 1 having an opacity of at least about 50%.

4. The film according to claim 3, wherein said film is substantially void of titanium dioxide.

5. The film according to claim 1, wherein said film comprises an olefin block copolymer .

6. The film according to claim 5, wherein the olefin block copolymer is a propylene-based polymeric composition.

7. The film according to claim 5, wherein the olefin block copolymer is an ethylene-based polymeric composition.

8. The film according to claim 1, wherein the film comprises from about 10% to about 60% of polypropylene.

9. The film according to claim 1 wherein said film comprises from about 30% to about 60% by weight of a filler.

10. The film according to claim 1, wherein the film is a coextruded multilayer film.

1 1. The film according to claim 1, wherein the film is a monolayer film.

12. The film according to claim 1, wherein the film has a hydrohead pressure of at least 200 psi.

13. A breathable, thermoplastic film having a basis weight of from about 5 gsm to about 20 gsm; a water vapor transmission rate of at least about 500 grams - H20/24-hour/m2; a CD load at break of at least 0.7 N/cm; an MD load at break of at least about 2.0 N/cm; a ratio of the MD load at break to the CD load at break of from about 1 to about 10, and at least one of a machine-direction notched Elmendorf tear strength of at least about 5 g or a machine-direction notched trapezoidal tear strength of at least about 15 g.

14. The film according to claim 13 having an opacity of at least about 50%.

15. The film according to claim 13, wherein said film comprises an olefin block copolymer .

16. The film according to claim 15, wherein the olefin block copolymer is a propylene-based polymeric composition.

17. The film according to claim 13, wherein the film comprises from about 10% to about 60% of polypropylene.

18. The film according to claim 13 wherein said film comprises from about 30% to about 60% by weight of a filler.

19. The film according to claim 13, wherein the film is a coextruded multilayer film.

20. A laminated article comprising:

a. a first layer comprising a breathable, thermoplastic film having a basis weight less than or equal to about 15 gsm and a water vapor transmission rate of at least about 500 grams H20/24-hour/m2; wherein said film has a ratio of the MD load at break to the CD load at break of less than about 10, and at least one of a machine-direction notched Elmendorf tear strength of at least about 5 g or a machine-direction notched trapezoidal tear strength of at least about 15 g, said first layer having a surface;

b. a substrate attached to the surface of the film.

21. A method of making a thermoplastic film comprising:

extruding a molten web comprising a thermoplastic polymer onto a first chill roller; said first chill roller operating at a first peripheral velocity VI and said first chill roller having a first temperature Tl wherein Tl is below a melting point of said thermoplastic polymer to thereby cool said web to form a film;

advancing said film to a stretching roller downstream of said first chill roller, said stretching roller rotating at a second peripheral velocity V2, which is greater than VI, wherein said stretching roller has a temperature T2;

wherein said stretching roller stretches said film in the machine-direction to produce a film having a substantially uniform thickness with limited machine-direction orientation and a ratio of machine-direction load at break to a cross-direction load at break of less than about 1 Ox;

and at least one of a machine-direction notched Elmendorf tear strength of at least 5 g or a machine-direction notched trapezoidal tear strength of at least 15 g.