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US 2019/0322086 A1Published application
Multilayer films and methods thereof
AssigneeDow Global Technologies LLC
InventorsJong Young Lee, Hrishikesh R. Munj
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Abstract
Embodiments disclosed herein include multilayer blown films having a cling layer and a release layer, wherein the cling layer comprises (i) an ethylene/alpha-olefin elastomer, and (ii) a polyethylene polymer selected from ultra-low density polyethylene, a very low density polyethylene, or combinations thereof, and the release layer comprises an ethylene/alpha-olefm resin.
Claims11
A multilayer blown film comprising a cling layer and a release layer, wherein:
- the cling layer comprises:
- (i) an ethylene/alpha-olefin elastomer having a density in the range of 0.855 to 0.890 grams/cm3 and a melt index, I2, in the range of 0.1 to 30 grams/10 minutes;
- and
- (ii) a polyethylene polymer selected from ultra-low density polyethylene, a very low density polyethylene, or combinations thereof, wherein the polyethylene polymer has a density in the range 0.885 to 0.915 grams/cm3, a melt index, I2, in the range of 0.1 to 30 grams/10 minutes, and a purge fraction greater than 20 percent as determined by the Crystallization Elution Fractionation (CEF) test method;
- and
- the release layer comprises an ethylene/alpha-olefin resin that is characterized by the following properties:
- (a) a melt index, 12, of from 0.1 to 30.0 g/10 min;
- (b) a density of from 0.910 to 0.930 g/cc;
- and
- (c) a purge fraction of less than 2% as determined by the Crystallization Elution Fractionation (CEF) test method.
7 more elements
A method of making a multilayer blown film, the method comprising:
- providing a cling layer composition comprising (i) an ethylene/alpha-olefin elastomer having a density in the range of 0.855 to 0.890 grams/cm3 and a melt index, I2, in the range of 0.1 to 30 grams/10 minutes;
- and (ii) a polyethylene polymer selected from ultra-low density polyethylene, a very low density polyethylene, or combinations thereof, wherein the polyethylene polymer has a density in the range 0.885 to 0.915 grams/cm3, a melt index, I2, in the range of 0.1 to 30 grams/10 minutes, and a purge fraction greater than 20 percent as determined by the Crystallization Elution Fractionation (CEF) test method;
- providing a release layer composition comprising an ethylene/alpha-olefin resin that is characterized by the following properties:
- (a) a melt index, I2, of from 0.1 to 30.0 g/10 min;
- (b) a density of from 0.910 to 0.930 g/cc;
- and (c) a purge fraction of less than 2% as determined by the Crystallization Elution Fractionation (CEF) test method;
- coextruding the cling layer composition with the release layer composition in an extruder to form a tube having a cling layer and a release layer;
- and
- cooling the tube to form a multilayer blown stretch film.
6 more elements
Dependencies are inferred from the claim text.