Enhanced bag drop film and packaging using oriented high-density polyethylene
In one example embodiment, disclosed is a polyethylene film, which in example embodiment(s) may comprise, consists essentially or, or consists of: (A) a core layer and a first tie layer on a first side of the core layer consisting essentially of: (i) at least about 20 wt. % olefin-block copolymer; (ii) at least about 40 wt. % low-density polyethylene; and (iii) at least about 40 wt. % high-density polyethylene, wherein “consisting essentially of” and “about,” among other words, are defined elsewhere in this disclosure; (B) a second tie layer on a second side of the core layer comprising, consisting essentially of, or consisting of: (i) at least about 20 wt. % low-density polyethylene; and (ii) at least about 40 wt. % high-density polyethylene; and (C) skin layer(s), be oriented in one or two directions; and contain additional layers external to the skin layer(s).
1 . A polyethylene film comprising:
a core layer having a thickness from about 20 μm to about 100 μm;
a first tie layer on a first side of the core layer consisting essentially of: (i) at least about 20 wt. % olefin-block copolymer; (ii) at least about 40 wt. % low-density polyethylene; and (iii) at least about 40 wt. % high-density polyethylene; and
a second tie layer on a second side of the core layer comprising: (i) at least about 20 wt. % low-density polyethylene; and (ii) at least about 40 wt. % high-density polyethylene,
wherein the first tie layer and the second tie layer each have a thickness from about 3 μm to about 12 μm;
wherein the polyethylene film is oriented.
2 . The polyethylene film of claim 1 , wherein the core layer consists of at least about 50 wt. % high-density polyethylene, low-density polyethylene, and, optionally, about 5 wt. % of hydrocarbon resin and/or additives.
3 . The polyethylene film of claim 2 , further comprising a first skin layer on the first tie layer and a second skin layer on the second tie layer, wherein the first skin layer and the second skin layer comprise antiblock additive(s), optionally in a masterbatch solution.
4 . The polyethylene film of claim 1 , wherein one or both outer surfaces of the polyethylene film is/are treated.
5 . The polyethylene film of claim 1 , wherein thickness of the core layer is from about 20 μm to about 75 μm.
6 . The polyethylene film of claim 1 , wherein thickness of at least one of the first tie layer and the second tie layer is from about 3 μm to about 6 μm.
7 . The polyethylene film of claim 5 , wherein thickness of at least one of the first tie layer and the second tie layer is from about 3 μm to about 6 μm.
8 . The polyethylene film of claim 1 , wherein the olefin-block copolymer contains ethylene polymer.
9 . The polyethylene film of claim 1 comprises at least two coextruded layers.
10 . The polyethylene film of claim 1 is a cast or blown film.
11 . The polyethylene film of claim 1 , further comprising a first skin layer on the first tie layer and a second skin layer on the second tie layer, wherein the first skin layer and the second skin layer comprise antiblock additive(s), optionally in a masterbatch solution.
12 . The polyethylene film of claim 11 , wherein the masterbatch solution is polyethylene-based.
13 . The polyethylene film of claim 11 , wherein the first skin layer further comprises ethylene-propylene copolymer(s), and the second skin layer excludes ethylene-propylene copolymer(s).
14 . The polyethylene film of claim 11 , wherein the first skin layer further comprises ethylene-propylene copolymer(s), and the second skin layer further comprises low-density polyethylene.
15 . The polyethylene film of claim 11 , wherein the first skin layer and second skin further comprise ethylene-propylene copolymer(s).
16 . The polyethylene film of claim 15 , wherein the second skin further comprises polypropylene-based elastomer(s).
17 . The polyethylene film of claim 1 , wherein the second tie layer further comprises at least at least about 40 wt. % olefin-block copolymer.
18 . The polyethylene film of claim 17 , wherein the olefin-block copolymer contains ethylene polymer.
19 . The polyethylene film of claim 11 , wherein the second tie layer further comprises at least at least about 40 wt. % olefin-block copolymer.
20 . The polyethylene film of claim 19 , wherein the olefin-block copolymer contains ethylene polymer.