received by the International Bureau on 26 March 2015 (26.03.2015)

1. A coextruded multilayer film comprising:

a core component comprising from 15 to 1000 alternating layers of layer A and layer B; layer A having a thickness from 100 nm to 500 nm and comprising a propylene-based polymer having a crystallization temperature (T_\c);

layer B comprising a second polymer having a glass transition temperature (T₂g), wherein l_\c <T₂g; and

layer A has an effective moisture permeability from 1.55 g-mil/m²/24 hr to less than or equal to 4.65 g-mil/m /24 hr .

2. The multilayer film of claim 1 wherein layer A has a thickness from 200 nm to 400 nm.

3. The multilayer film of any of claims 1-2 wherein layer A comprises a propylene homopolymer with a TjC less than 125°C.

4. The multilayer film of any of claims 1-3 wherein the propylene homopolymer has a melt flow rate from 1.5 g/10 min to 2,5 g/10 min.

5. The multilayer film of any of claims 1-4 wherein the propylene homopolymer has a crystallinity from 35% to 60%.

6. The multilayer film of any of claims 1-5 wherein the second polymer is selected from the group consisting of a polycarbonate and a cyclic olefin polymer.

7. The multilayer film of any of claims 1-6 wherein layer A comprises a propylene homopolymer with a T\C less than 125°C and a melt flow rate from 1.5 g/10 min to 2.5 g/10 min; and

layer B comprises a polycarbonate with a T g greater than 125°C.

8. The multilayer film of any of claims 1-7 wherein T₂g -T\ C is greater than 20°C.

9. The multilayer film of claim any of claims 1-8 wherein layer A has a thickness from 200 nm to 400 nm and layer A has an effective moisture permeability from 3.1 g-mil/m²/24 hr to less than or equal to 4.65 g-mil/m²/24 hr .

10. The multilayer film of claim any of claims 1-6 wherein layer A comprises a propylene homopolymer with a T\C less than 125°C; and

layer B comprises a cyclic olefin polymer with a T^ greater than 125°C,

1 1. The multilayer film of claim 10 wherein T^-T] c is greater than 20°C.

12. The multilayer film of claim 10 wherein the cyclic olefin polymer is a cyclic block copolymer.

13. The multilayer film of claim 12 wherein the cyclic block copolymer comprises a pentablock hydrogenated styrene.

14. The multilayer film of claim 10 wherein layer A has a thickness from 200 nm to 400 nm and layer A has an effective moisture permeability from 3,1 g-mil/m²/24 hr to less than or equal to 4,65 g-mil/m²/24 hr,

15. The multilayer film of any of claims 1-14 wherein the core component has a thickness from 0.1 mil to 10.0 mil.

16. The multilayer film of any of claims 1-15 comprising at least one skin layer.

17. The multilayer film of claim 16 wherein the skin layers comprise a propylene-based polymer.

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