Multi-layer films and articles made therefrom

Patent metadata

Field	Value
Publication number	US-10870253-B2
Application number	US-201515301378-A
Country	US
Kind code	B2
Filing date	Apr 1, 2015
Priority date	Apr 1, 2014
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

A multilayer film comprising a first layer comprising from greater than 0 to 100 percent by weight of an ethylene/α-olefin interpolymer composition (LLDPE), based on the total weight of the film composition; and a second layer comprising at least 5 percent by weight of the second layer, of an anhydride and/or carboxylic acid functionalized ethylene/alpha-olefin interpolymer having a density in the range of from 0.855 to 0.900 g/cm3; and having a melt index (190° C./2.16 kg) of greater than 200 g/10 min; and from 60 to 95 percent, by weight of the second layer, of EVOH is provided.

First claim

We claim:

1. A multilayer film comprising:
(1) a first layer comprising
from greater than 0 to 100 percent by weight of the first layer of an ethylene/α-olefin interpolymer composition, based on the total weight of the film composition, having a Comonomer Distribution Constant (CDC) in the range of from 75 to 200; a zero shear viscosity ratio (ZSVR) of at least 2; a density in the range of from 0.865 to 0.930 g/cm 3 , a melt index (I2) in a range of from 0.1 to 5 g/10 minutes, less than 120 total unsaturation units/1,000,000 carbons, and long chain branching frequency in the range of 0.01 to 3 long chain branches (LCB) per 1000 carbons; and

(2) a second layer comprising:
from 5 to 10 percent, by weight of the second layer, of a maleic anhydride functionalized ethylene/alpha-olefin interpolymer having a density in the range of from 0.855 to 0.900 g/cm 3 , a melt index (190° C/2.16 kg) of greater than 200 g/10 min; and from 80 to 95 percent, by weight of the second layer, of ethylene vinyl alcohol (EVOH) including 32 mol % to 44 mol % of ethylene, wherein the second layer represents from 2 to 10% of a total thickness of the multilayer film.

2. The multilayer film according to claim 1 further comprising at least one tie layer between the first and second layer.

3. The multilayer film according to claim 2 , wherein the tie layer comprises at least one component selected from the group consisting of ethylene/vinyl acetate copolymers, ethylene/methyl acrylate copolymers, ethylene/butyl acrylate copolymers, linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), and ultralow density polyethylene (ULDPE).

4. The multi-layer film according to claim 2 , further comprising two skin layers.

5. The multi-layer film according to claim 4 , wherein at least one of the two skin layers comprises an ethylene-based polymer.

6. The multi-layer film according to claim 4 , wherein at least one of the two skin layers comprises an ethylene/α-olefin interpolymer composition having a Comonomer Distribution Constant (CDC) in the range of from 75 to 200; a zero shear viscosity ratio (ZSVR) of at least 2; a density in the range of from 0.865 to 0.930 g/cm 3 , a melt index (I 2 ) in a range of from 0.1 to 5 g/10 minutes, less than 120 total unsaturation units/1,000,000 carbons, and long chain branching frequency in the range of 0.01 to 3 long chain branches (LCB) per 1000 carbons.

7. The multilayer film according to claim 1 , wherein the first layer further comprises from 25 to 95 percent by weight of a propylene/α-olefin interpolymer composition, based on the total weight of the film composition, wherein said propylene/α-olefin interpolymer composition comprises a propylene/α-olefin copolymer or a propylene/ethylene/butene terpolymer, wherein said propylene/α-olefin interpolymer has a crystallinity in the range of from 1 percent by weight to 30 percent by weight, a heat of fusion in the range of from 2 Joules/gram to 50 Joules/gram, and a DSC melting point in the range of 25° C. to 110° C.

8. The multi-layer film according to claim 1 , wherein the film exhibits no greater than a 20% increase in oxygen transmission rate upon 100% pre-stretch.

9. An article comprising the multi-layer film according to claim 1 .

10. The article according to claim 9 , wherein the article is a stretch hood.

11. The article according to claim 9 , wherein the article is a stretch sleeve.

12. The article according to claim 9 , wherein the article is a flexible package.

13. A multilayer film comprising:
(1) a first layer comprising
from greater than 0 to 100 percent by weight of the first layer of an ethylene/α-olefin interpolymer composition, based on the total weight of the film composition, having a Comonomer Distribution Constant (CDC) in the range of from 75 to 200; a zero shear viscosity ratio (ZSVR) of at least 2; a density in the range of from 0.865 to 0.930 g/cm 3 , a melt index (I 2 ) in a range of from 0.1 to 5 g/10 minutes, less than 120 total unsaturation units/1,000,000 carbons, and long chain branching frequency in the range of 0.01 to 3 long chain branches (LCB) per 1000 carbons; and

(2) a second layer comprising:
from 5 to 10 percent, by weight of the second layer, of an ultra-low viscosity maleic anhydride-grafted ultra-low density ethylene/alpha-olefin having from 0.5 to 2% bound maleic anhydride and a melt index of from 200 to 1000 g/10 min; and from 90 to 95 percent, by weight of the second layer, of ethylene vinyl alcohol (EVOH) including 32 mol % to 44 mol % of ethylene, wherein the second layer represents from 2 to 10% of a total thickness of the multilayer film.

Assignees

• Dow Global Technologies Llc

Inventors

• Deplace Fanny
• Ma Hongming
• Walther Brian W
• Allgeuer Thomas
• Sandkuehler Peter H R
• Manrique Antonio
• Hernandez Claudia
• Domenech Angels
• Chopin Lamy J Iii

Classifications

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L23/14

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08L23/0861

  Saponified copolymers, e.g. ethylene vinyl alcohol copolymers · CPC title

• C08L23/0815

  with aliphatic 1-olefins containing one carbon-to-carbon double bond · CPC title

• B65D31/02

  with laminated walls · CPC title