Cross Direction Tear Film and Package
A film having a cross directional tear/machine directional tear ratio below 1 is described. The film has a sealant layer with a cyclic olefin copolymer. The film can be used in the manufacture of packages having an easy cross-direction tear open feature. There are also provided methods for the production of the film and packages made of the film.
1 . A film comprising a sealant layer comprising a cyclic olefin copolymer, the film having a cross directional tear/machine directional tear ratio below 1.
2 . The film of claim 1 , wherein said ratio is between 0.05 and 0.9.
3 . The film of claim 1 , wherein said ratio is between 0.05 and 0.7.
4 . The film of claim 1 , wherein said ratio is between 0.05 and 0.5.
5 . The film of claim 1 , wherein said ratio is between 0.05 and 0.3.
6 . The film of claim 1 , wherein said ratio is between 0.05 and 0.1.
7 . The film of claim 1 , wherein said sealant layer comprises 5 to 95 weight % of a cyclic olefin copolymer.
8 . The film of claim 1 , wherein said sealant layer comprises 5 to 80 weight % of a cyclic olefin copolymer.
9 . The film of claim 1 , wherein said sealant layer comprises 15 to 40 weight % of a cyclic olefin copolymer.
10 . The film of claim 1 , wherein said sealant layer comprises at least 10 weight % of a cyclic olefin copolymer.
11 . The film of claim 1 wherein said sealant layer comprises at least 20 weight % of a cyclic olefin copolymer.
12 . The film of claim 1 wherein said sealant layer comprises at least 30 weight % of a cyclic olefin copolymer.
13 . The film of claim 1 wherein said sealant layer comprises at least 40 weight % of a cyclic olefin copolymer.
14 . The film of claim 1 , wherein said sealant layer further comprises an ethylene or propylene polymer.
15 . The film of claim 1 , wherein said sealant layer comprises a plastomer or ionomer.
16 . The film of claim 1 , wherein said sealant layer further comprises linear low-density polyethylene, linear medium density polyethylene, low-density polyethylene, medium density polyethylene, ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer, ethylene methyl acrylic acid copolymer, or high density polyethylene.
17 . The film of claim 1 , wherein said film is a monolayer film comprising said sealant layer comprising a cyclic olefin copolymer.
18 . The film of claim 1 comprising from 5 to 95 weight % of said sealant layer.
19 . The film of claim 1 comprising from 10 to 90 weight % of said sealant layer.
20 . The film of claim 1 comprising from 10 to 70 weight % of said sealant layer.
21 . The film of claim 1 comprising from 15 to 40 weight % of said sealant layer.
22 . The film of claim 1 , wherein said film further comprises at least one additional layer.
23 . The film of claim 1 , wherein said film further comprises from 5 to 95 weight % of at least one additional layer.
24 . The film of claim 1 , wherein said film further comprises at least one additional layer comprising an ethylene or propylene polymer.
25 . The film of claim 1 , wherein said film further comprises at least one additional layer comprising linear low-density polyethylene, linear medium density polyethylene, low-density polyethylene, medium density polyethylene, ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer, ethylene methyl acrylic acid copolymer, or high density polyethylene.
26 . The film of claim 1 , wherein said film further comprises from 10-20 weight % of an additional layer.
27 . The film of claim 1 , wherein said film further comprises from 10-20 weight % of an additional layer comprising linear medium density polyethylene, high density polyethylene, or a polyolefin plastomer.
28 . The film of claim 1 , wherein said film further comprises from 12-75 weight % of an additional layer.
29 . The film of claim 1 wherein said film further comprises from 12-75 weight % of an additional layer that is a print receivable layer.
30 . The film of claim 1 , wherein said film further comprises from 12-75 weight % of an additional layer comprising linear medium density polyethylene or high density polyethylene.
31 . The film of claim 1 , wherein said film further comprises from 5-15 weight % of an additional layer.
32 . The film of claim 1 , wherein said film further comprises from 5-15 weight % of an additional layer comprising an ethylene vinyl alcohol copolymer.
33 . The film of claim 1 , wherein said film further comprises from 5-15 weight % of an additional layer comprising nylon.
34 . The film of claim 1 , wherein said film further comprises from 4-12 weight % of an additional layer.
35 . The film of claim 1 , wherein said film further comprises from 4-12 weight % of a tie layer.
36 . The film of claim 1 , wherein said film further comprises from 4-12 weight % of an additional layer comprising an interpolymer adhesive.
37 . The film of claim 1 , wherein said film further comprises from 4-12 weight % of an additional tie layer.
38 . The film of claim 1 further comprising:
a layer comprising a linear medium density polyethylene polymer;
a first tie layer;
a layer comprising an ethylene vinyl alcohol copolymer;
a second tie layer;
a layer comprising a linear medium density polyethylene polymer.
39 . The film of claim 1 further comprising by weight of the total composition:
from 10-20 weight % of a layer comprising a linear medium density polyethylene polymer;
from 4-12 weight % of a layer comprising a first tie layer;
from 10-15 weight % of a layer comprising an ethylene vinyl alcohol copolymer;
from 4-12 weight % of a layer comprising a second tie layer;
from 12-75 weight % of a layer comprising a linear medium density polyethylene polymer.
40 . The film of claim 1 further comprising:
a layer comprising a high density polyethylene polymer;
a layer comprising a first tie layer;
a layer comprising an ethylene vinyl alcohol copolymer polymer;
a layer comprising a second tie layer;
a layer comprising a high density polyethylene polymer.
41 . The film of claim 1 further comprising:
from 10-20 weight % of a layer comprising a high density polyethylene polymer;
from 4-12 weight % of a layer comprising a first tie layer;
from 5-15 weight % of a layer comprising an ethylene vinyl alcohol copolymer;
from 4-12 weight % of a layer comprising a second tie layer;
from 12-75 weight % of a layer comprising a high density polyethylene polymer.
42 . The film of claim 1 further comprising:
a layer comprising a high density polyethylene polymer;
a layer comprising a first tie layer;
a layer comprising a nylon resin;
a layer comprising a second tie layer;
a layer comprising a high density polyethylene polymer.
43 . The film of claim 1 further comprising:
from 10-20 weight % of a layer comprising a high density polyethylene polymer;
from 4-12 weight % of a layer comprising a first tie layer;
from 5-15 weight % of a layer comprising a nylon resin;
from 4-12 weight % of a layer comprising a second tie layer;
from 12-75 weight % of a layer comprising a high density polyethylene polymer.
44 . The film of claim 1 further comprising:
a layer comprising a polyolefin plastomer;
a layer comprising a high density polyethylene polymer.
45 . The film of claim 1 further comprising by weight of the total composition:
from 10-20 weight % of a layer comprising a polyolefin plastomer;
from 12-75 weight % of a layer comprising a high density polyethylene polymer.
46 . The film of claim 1 , wherein said film comprises a blown film.
47 . The film of claim 1 , wherein said film comprises a cast film.
48 . The film of claim 1 comprising from 10 to 40 weight % of said sealant layer and a cross directional Elmendorf tear/machine directional Elmendorf tear ratio of from 0.05 to 0.65.
49 . The film of claim 1 comprising from 10 to 30 weight % of said sealant layer and a cross directional Elmendorf tear/machine directional Elmendorf tear ratio less than 0.20.
50 . The film of claim 1 comprising from 10 to 25 weight % of said sealant layer and a cross directional Elmendorf tear/machine directional Elmendorf tear ratio less than 0.15.
51 . The film of claim 1 comprising from 10 to 15 weight % of said sealant layer and a cross directional Elmendorf tear/machine directional Elmendorf tear ratio of less than 0.6.
52 . The film of claim 1 , wherein said tear is determine using Elmendorf tear testing.
53 . The film of claim 1 laminated to a substrate.
54 . The film of claim 53 , wherein the substrate is a layer of polyester, polypropylene, biaxially oriented nylon, biaxially oriented polypropylene, or polyethylene.
55 . The film of claim 53 , laminated to the substrate by adhesive lamination, extrusion lamination, or thermal lamination.
56 . The film of claim 1 , further comprising surface or reverse printing.
57 . A package comprising the film according to claim 1 .
58 . The package of claim 57 , wherein said package is three sided.
59 . The package of claim 57 , wherein said package is four sided.
60 . The package of claim 57 , wherein said package is a pillow pouch.
61 . The package of claim 57 , wherein said package is a standup pouch.
62 . The package of claim 57 , wherein said package is a cross-directional tear package.
63 . The package of claim 57 having a top seal, bottom seal, side seal, or fin seal.
64 . The package of claim 57 , wherein said package comprises a tear-start notch.
65 . The package of claim 57 , wherein said package comprises a hold and tear segment.
66 . A method for producing a film according to claim 1 , the method comprising forming a film comprising a sealant layer comprising a cyclic olefin copolymer.
67 . The method of claim 66 , wherein said method comprises blowing said film.
68 . The method of claim 66 , wherein said method comprises casting said film.