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1. (WO2006115585) FILM DE POLYPROPYLENE PERMEABLE
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 film structure that is permeable to both gas and water vapor, comprising: a core layer comprising a propylene polymer, a beta-nucleating agent, and a filler;
a first skin layer on a first side of the core layer, the first skin layer comprising a thermoplastic polymer; and
a second skin layer on a second side of the core layer, the second skin layer comprising a thermoplastic polymer;
wherein the film structure is opaque; and
wherein the film structure has a water vapor transmission rate greater than

300 g/m /day and a Gurley air permeability less than 3,000 s/10 cc.

2. The film structure of claim 1, wherein the propylene polymer of the core layer is selected from the group consisting of isotactic propylene homopolymer, isotactic propylene impact copolymer, isotactic propylene heterophasic copolymer, and mixtures thereof.

3. The film structure of claim 1, wherein the propylene polymer of the core layer is an isotactic propylene homopolymer having an m-pentad fraction of from 85% to 99%, as measured by 13C NMR spectroscopy.

4. The film structure of claim 1, wherein the propylene polymer of the core layer is a mixture of at least two isotactic propylene homopolymers having different m-pentad fractions.

5. The film structure according to any of the preceding claims, wherein at least one of the first and second skin layers is a cavitated layer.

6. The film structure according to any of the preceding claims, wherein at least one of the first skin layer and the second skin layer is a cavitated layer, a microperforated layer, and/or an embossed layer.

7. The film structure according to any of the preceding claims, further comprising one or more intermediate layers between the core layer and at least one of the first skin layer and the second skin layer.

8. The film structure according to any of the preceding claims, wherein at least one of (i) an intermediate layer between the core layer and first skin layer and (ii) an intermediate layer between the core layer and second skin layer is a cavitated layer, an emobossed layer or a microperforated layer.

9. The film structure according to any of the preceding claims, wherein at least one of the intermediate layer (i) and the intermediate layer (ii) is a cavitated layer comprising a cavitating agent selected from the group consisting of a beta-nucleating agent, a filler, and a mixture thereof.

10. The film structure according to any of the preceding claims, wherein an outer surface of the second skin layer has been metallized.

11. The film structure according to any of the preceding claims, wherein the beta-nucleating agent is a two-component beta-nucleating agent, the first component of the beta-nucleating agent being selected from the group consisting of pimelic acid, azelaic acid, o-phthalic acid, terephthalic acid, and isophthalic acid, and the second component of the beta-nucleating agent being selected from the group consisting of an oxide, a hydroxide, and an acid salt of a Group II metal.

12. The film structure according to any of the preceding claims, wherein the filler of the core layer is an inorganic filler selected from the group consisting of CaCO3, BaCO3, clay, talc, silica, mica, TiO2, and mixtures thereof.

13. The film structure according to any of the preceding claims, wherein the core layer comprises from 1 wt% to 50 wt% of the filler, based on the total weight of the core layer.

14. The film structure according to any of the preceding claims, wherein the core layer comprises from 50 ppm to 1,000 ppm of the beta-nucleating agent, based on the amount of propylene polymer in the core layer.

15. The film structure according to any of the preceding claims, wherein the film structure is a biaxially oriented film structure.

16. The film structure according to any of the preceding claims, wherein each layer of the film structure is a cavitated layer.

17. The film structure according to any of the preceding claims, wherein at least one outer surface of the film structure has a coating thereon.

18. The film structure according to any of the preceding claims, a container comprising an in-mold label, wherein the film structure is used as an in- mold label.

19. The film structure according to any of the preceding claims, further comprising an adhesive on an outer surface of the film structure.

20. The film structure according to claim 19, wherein the adhesive is a cold glue adhesive.

21. The film structure according to claim 19, wherein the adhesive is a pressure-sensitive adhesive.

22. The film structure according to any of the preceding claims, wherein the film structure is used as a label.