Moisture vapor permeable film including ethylene copolymer and articles including the same
View Patent ↗A continuous film that includes ethylene copolymer selected from the group consisting of ethylene vinyl acetate, ethylene n-butylacrylate carbon monoxide, ethylene vinyl acetate carbon monoxide, and combinations thereof. The film exhibits a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I.
1. A continuous film consisting essentially of:
ethylene vinyl acetate copolymer,
a second polymer other than an ethylene vinyl acetate copolymer, the second polymer selected from the group consisting of a block copolymer, a polyether polyamide, a polyether polyester, a aromatic aliphatic copolyester, a polyurethane, an interpolymer of ethylene, a polylactic acid, and combinations thereof, and
optionally plasticizer,
said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I.
2. The film of claim 1 , wherein the second polymer comprises aromatic aliphatic copolyester polymer.
3. The film of claim 2 , wherein said plasticizer is present and is selected from the group consisting of citric acid esters, benzoic acid esters and combinations thereof.
4. The film of claim 1 , wherein said plasticizer is present and is selected from the group consisting of citric acid esters, benzoic acid esters, and combinations thereof.
5. The film of claim 1 , further comprising tackifying resin.
6. The film of claim 1 , wherein said film has an area weight of no greater than 15 g/m 2 .
7. The film of claim 1 , wherein said film has an area weight of no greater than 10 g/m 2 .
8. The film of claim 1 , wherein said ethylene vinyl acetate copolymer has a melt index of at least 50 g/10 min at 190° C.
9. The film of claim 1 , wherein said ethylene vinyl acetate copolymer has a melt index of at least 100 g/10 min at 190° C.
10. The film of claim 1 , wherein said film exhibits a moisture vapor transmission rate of at least 400 g/m 2 /day when measured according to MVTR Test Method I.
11. The film of claim 1 , wherein said film exhibits a moisture vapor transmission rate of at least 600 g/m 2 /day when measured according to MVTR Test Method I.
12. An article comprising:
a first layer; and
a second layer comprising the continuous film of claim 1 bonded to said first layer.
13. The article of claim 12 , wherein said first layer comprises at least one of a fibrous nonwoven web and paper.
14. A continuous pressure sensitive adhesive film consisting essentially of:
a. a first ethylene vinyl acetate copolymer having a vinyl acetate content of at least 25%;
b. a second polymer different from said first ethylene vinyl acetate copolymer;
c. plasticizer; and
d. optionally, tackifying agent; and
e. optionally, antioxidant,
said film exhibiting a moisture vapor transmission rate of at least 100 g/m 2 /day when measured according to MVTR Test Method I.
15. The pressure sensitive adhesive film of claim 14 , wherein said second polymer comprises ethylene vinyl acetate.
16. The pressure sensitive adhesive film of claim 14 comprising from about 5% by weight to about 15% by weight said tackifying agent.
17. The pressure sensitive adhesive film of claim 14 , wherein said second polymer comprises aromatic aliphatic copolyester.
18. The pressure sensitive adhesive film of claim 17 comprising from about 5% by weight to about 15% by weight said tackifying agent.
19. The pressure sensitive adhesive film of claim 14 , comprising no greater than 35% by weight said second polymer, said second polymer being selected from the group consisting of a block copolymer, a polyether polyamide, a polyether polyester, an aromatic aliphatic copolyester, a polyurethane, an interpolymer of ethylene, a polylactic acid, and combinations thereof.
20. The pressure sensitive adhesive film of claim 14 , wherein said film exhibits a moisture vapor transmission rate of at least 400 g/m 2 /day when measured according to MVTR Test Method I.