FIELD OF THE INVENTION

This disclosure relates to films particularly suitable for stretch hood applications. More particularly, this disclosure relates to multi-layer films particularly suitable for stretch hood applications comprising one or more intermediate layers comprising a blend of a propylene-based elastomer and a linear low density polyethylene.

BACKGROUND OF THE INVENTION

In commercial packaging art, individual articles as well as bundles of articles, including bundles of articles on pallets, are frequently packaged using so called stretch cling film in a stretch wrapping technique. In the stretch wrapping technique, a thin web of film is stretched and applied under tension around the articles to be wrapped or bundled. After wrapping is complete, the film attempts to relax and thus applies a compressive force on the bundled articles prohibiting movement. It is desired that the stretch film have some inherent cling such that it will adhere to itself, and prevent relaxation back to its unstretched state so that the film will not unwrap and cause slippage of the stretched overlaid film layers. Given the importance and usefulness of these films, improvements in this area are highly desirable. Background references included are U.S. Pat. Nos. 5,752,362, 5,907,942, and 6,602,598; Application Publication Nos. 2003/1188536 and 2008/311368.

SUMMARY OF THE INVENTION

In one aspect, embodiments described herein provide a multilayer film, comprising: a) first and second outer layers; b) an inner layer interposing the first and second outer layers, the inner layer comprising 30.0 to 50.0 wt % of a first propylene-based elastomer or a polyethylene having a g′visof 0.50 to 0.85; c) a first polyethylene-containing intermediate layer interposing the first outer layer and the inner layer, the first intermediate layer comprising 10.0 to 30.0 wt % of a second propylene-based elastomer, and d) a second polyethylene-containing intermediate layer interposing the inner layer and the second outer layer, the second intermediate layer 10.0 to 30.0 wt % of a third propylene-based elastomer. Particular films include those having a positive slope in the strain-strain curve in the region between 20.0% and 200.0% strain, and a stress value ≥8.5 MPa at strain of 20.0%.

