Multilayer film including foam layer and gas barrier layer
A multilayer film includes an outer foam layer and a gas barrier layer. The multilayer film may also include at least one tie layer and at least one inner layer, and can be configured to have various film layer constructions. For example, the multilayer film can be configured as a five-layer, six-layer, or seven-layer films. The multilayer film can provide unique texture, softness, quietness, gas barrier properties, light weight and low cost per volume. Further, one or more layers of the multilayer film can contain a vinyl-bond rich triblock copolymer to provide sound absorbing properties.
1. A multilayer film including at least one foam layer comprising an outer foam layer and a gas barrier layer, wherein at least one of the at least one foam layer comprises a vinyl-bond rich triblock copolymer selected from a group consisting of a vinyl-bond rich SIS block copolymer, a vinyl-bond rich SEPS block copolymer, and a vinyl-bond rich SEEPS block copolymer, wherein the vinyl-bond rich triblock copolymer has a tangent delta peak temperature of greater than about −20° C., and wherein the multilayer film has an elastic modulus of about 2 ksi to about 40 ksi when measured according to ASTM D882.
2. The multilayer film of claim 1 , further including at least one tie layer and at least one inner layer.
3. The multilayer film of claim 2 , wherein the multilayer film is a six-layer film having a seal layer/tie layer/barrier layer/tie layer/inner layer/outer foam layer construction.
4. The multilayer film of claim 3 , wherein the inner layer is a foam layer.
5. The multilayer film of claim 2 , wherein the multilayer film is a seven-layer film having a seal layer/tie layer/barrier layer/tie layer/inner layer/inner layer/outer foam layer construction.
6. The multilayer film of claim 5 , wherein at least one of the inner layers is a foam layer.
7. The multilayer film of claim 2 , wherein the multilayer film is a seven-layer film having a seal layer/inner layer/tie layer/barrier layer/tie layer/inner layer/outer foam layer construction.
8. The multilayer film of claim 7 , wherein at least one of the inner layers is a foam layer.
9. The multilayer film of claim 2 , wherein the multilayer film is a six-layer film having a seal layer/inner layer/tie layer/barrier layer/tie layer/outer foam layer construction.
10. The multilayer film of claim 9 , wherein the inner layer is a foam layer.
11. The multilayer film of claim 2 , wherein the multilayer film is a five-layer film having a seal layer/tie layer/barrier layer/tie layer/outer foam layer construction.
12. The multilayer film of claim 1 , wherein the outer foam layer is formed from a polymer selected from ethylene vinyl acetate (EVA), ethylene methyl acrylate (EMA), ethylene alpha olefin copolymers, ethylene based elastomers, ethylene-propylene (EP) copolymers, and blends thereof, and a foaming agent.
13. The multilayer film of claim 1 , wherein the gas barrier layer comprises a polymer selected from polyvinylidene chloride, vinylidene copolymer, polyamide, and ethylene-vinyl alcohol copolymer.
14. The multilayer film of claim 13 , wherein the gas barrier layer is formed from a polymer blend comprising an amorphous polyamide and a functionalized rubber blend or compound.
15. The multilayer film of claim 2 , wherein at least one of the outer foam layer, inner layers, tie layers, and barrier layer comprises a vinyl-bond rich triblock copolymer.
16. The multilayer film of claim 1 , wherein the multilayer film has a thickness of about 100 μm to about 500 μm.