Multilayer film with high oxygen transmission

1. A multilayer film comprising:

A. a first layer which is a first outer film layer which serves as a heat seal layer, the first layer, the first layer having a thickness of from 1 to 20 percent of a total thickness of the multilayer film;

B. at least one second layer which serves as a high oxygen transmission layer, the at least one second layer comprising a blend of:

i. 5 to 35 wt % of a heterogeneous ethylene/alpha-olefin copolymer having a density of at least 0.89 g/cc; and

ii. 65 to 95 wt % of at least one member selected from the group consisting of:

a. ethylene acrylate copolymer;

b. homogeneous ethylene/alpha-olefin copolymer having a density of from 0.86 to 0.91 g/cc;

c. ethylene acrylic acid;

d. ethylene/vinyl acetate copolymer having a vinyl acetate monomer content of from 10 to 30 mole percent; and

e. styrene butadiene block copolymer; and

the at least one second layer having a thickness of from 60 to 98 percent of the total thickness of the multilayer film; the total thickness of the multilayer film being at least 1.5 mils, and the film having an oxygen transmission rate of at least 8,000 cc (STP)/m2/day/1 atm at 23 C at 0% RH measured according to ASTM 3985.

2. The multilayer film of claim 1 further comprising a third layer which is a second outer film layer which serves as a skin layer, the third layer having a thickness of from 1 to 20 percent of a total thickness of the multilayer film.

3. The multilayer film of claim 1 , wherein the multilayer film is not perforated.

4. The multilayer film of claim 1 , wherein the first layer comprises a first polymer selected from the group consisting of homogeneous ethylene/alpha-olefin copolymer, heterogeneous ethylene/alpha-olefin copolymer, high density polyethylene, low density polyethylene, linear low density polyethylene, ionomer resin, ethylene/unsaturated ester copolymer and ethylene/unsaturated acid copolymer.

5. The multilayer film of claim 2 , wherein the third layer comprises a second polymer selected from the group consisting of homogeneous ethylene/alpha-olefin copolymer, heterogeneous ethylene/alpha-olefin copolymer, high density polyethylene, low density polyethylene, ionomer resin, ethylene/unsaturated ester copolymer and ethylene/unsaturated acid copolymer.

6. The multilayer film of claim 1 , wherein the heterogeneous ethylene/alpha-olefin copolymer comprises 10-30 wt % of the second layer.

7. The multilayer film of claim 1 , wherein the multilayer film has a tensile strength at break in either the longitudinal or traverse direction of at least 6000 psi as measured in accordance with ASTM D882.

8. The multilayer film of claim 1 , wherein the multilayer film has an elongation at break in either the longitudinal or traverse direction of less than 700% as measured in accordance with ASTM D882.

9. The multilayer film of claim 1 , wherein the multilayer film has a Young's modulus in either the longitudinal or traverse direction of at least 5000 psi as measured in accordance with ASTM D882.

10. The multilayer film of claim 1 , wherein the multilayer film has a tear propagation-max load in the longitudinal direction of at least 80 grams as measured in accordance with ASTM D1938.

11. The multilayer film of claim 2 , wherein the at least one second layer makes up from 90 to 95 percent of the total film thickness, with the first and third layers together making up from 5 to 10 percent of the total film thickness.

12. The multilayer film of claim 1 , wherein the multilayer film has total film thickness of from 1.5 to 4.0 mils.

13. The multilayer film of claim 1 , wherein the multilayer film has a total free shrink at 185° F. of from 50 to 115 percent.

14. The multilayer film of claim 1 , wherein at least one layer of the multilayer film comprises a polymer network which has been crosslinked.

15. The multilayer film claim 1 , wherein the multilayer film has a total free shrink at 185° F. is less than 10%.

16. The multilayer film of claim 1 , wherein the multilayer film has an impact strength peak force of at least 22 Joules as measured in accordance with ASTM D3763.

17. The multilayer film of claim 1 , wherein the multilayer film has an oxygen transmission rate of at least 10,000 cc (STP)/m2/day/1 atm at 23 C at 0% RH measured according to ASTM 3985.

18. The multilayer film of claim 1 , wherein the ethylene/acrylate copolymer is selected from the group consisting of ethylene/methyl acrylate copolymer, ethylene/ethyl acrylate copolymer and ethylene/butyl acrylate copolymer.

19. A packaged product comprising:

A. a food product;

B. a package surrounding the product, the package comprising a multilayer film comprising:

i. a first layer which is a first outer film layer which serves as a heat seal layer, the first layer, the first layer having a thickness of from 1 to 20 percent of a total thickness of the multilayer film;

ii. at least one second layer which serves as a high oxygen transmission layer, the at least one second layer comprising a blend of:

a. 5 to 35 wt % of a heterogeneous ethylene/alpha-olefin copolymer having a density of at least 0.89; and

b. 65 to 95 wt % of at least one member selected from the group consisting of:

1) Ethylene acrylate copolymer;

2) Homogeneous ethylene/alpha-olefin copolymer having a density of from 0.86 to 0.91 g/cc;

3) Ethylene acrylic acid;

4) Ethylene/vinyl acetate copolymer having a vinyl acetate monomer content of from 10 to 30 mole percent; and

5) styrene butadiene block copolymer; and

the at least one second layer having a thickness of from 60 to 98 percent of the total thickness of the multilayer film; the total thickness of the multilayer film being at least 1.5 mils, and the film having an oxygen transmission rate of at least 8,000 cc (STP)/m2/day/1 atm at 23 C at 0% RH measured according to ASTM 3985.

20. A skin package comprising:

A. a food product;

B. a top web over the product, the top web having a multilayer film comprising:

i. a first layer which is a first outer film layer which serves as a heat seal layer, the first layer, the first layer having a thickness of from 1 to 20 percent of a total thickness of the multilayer film;

ii. at least one second layer which serves as a high oxygen transmission layer, the at least one second layer comprising a blend of:

a. 5 to 35 wt % of a heterogeneous ethylene/alpha-olefin copolymer having a density of at least 0.89; and

b. 65 to 95 wt % of at least one member selected from the group consisting of:

1) Ethylene acrylate copolymer;

2) Homogeneous ethylene/alpha-olefin copolymer having a density of from 0.86 to 0.91 g/cc;

3) Ethylene acrylic acid;

4) Ethylene/vinyl acetate copolymer having a vinyl acetate monomer content of from 10 to 30 mole percent; and

5) styrene butadiene block copolymer; and

the at least one second layer having a thickness of from 60 to 98 percent of the total thickness of the multilayer film; the total thickness of the multilayer film being at least 1.5 mils, and the film having an oxygen transmission rate of at least 8,000 cc (STP)/m2/day/1 atm at 23 C at 0% RH measured according to ASTM 3985; and

C. a substrate to which the multilayer film is adhered.