Polyethylene stretch films
AssigneeThe Dow Chemical Company
InventorsKaelyn C. Koch, Lisa M. Bolek
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Abstract
Monolayer and multilayer film structures having at least one layer of a polymer blend comprising at least one branched polymer (e.g., low density polyethylene (LDPE) or ethylene/vinyl actetate copolymer (EVA)) and at least one linear polyethylene (e.g., LLDPE) are disclosed. The film structures have a good overall balance of properties, including high ultimate elongation, excellent load retention and good machine direction tear. The films are especially useful for pallet wrapping applications.
Claims18
A stretch wrap film structure having balanced physical properties comprising at least one core layer comprised of a polymer blend, wherein the polymer blend comprises:
- (A) at least one linear polyethylene, and
- (B) at least one branched polymer selected from the group consisting of ethylene homopolymers and ethylene/vinyl acetate copolymers, wherein the linear polyethylene and the branched polymer in the polymer blend are in a ratio from about 5:1 to about 33:1.
A film structure having balanced physical properties suitable for use as a stretch wrap film structure comprising at least one layer of a polymer blend, wherein the polymer blend comprises:
- (A) at least one linear polyethylene, and
- (B) at least one low density polyethylene, wherein the linear polyethylene and the low density polyethylene in the polymer blend are in a ratio from about 5:1 to about 33:1 and wherein the composition falls within the area of polygon MNOPQ bounded by the points M(32, 0.02), N(7.3, 2), O(4.5, 4), P(7.3, 7), and Q(10.1, 7) in FIG. 1.
Dependencies are inferred from the claim text.