Patent ID: 8227546

Claim:
A multi-layer elastic air quenched blown film structure, the film comprising: A. A first layer comprising from 40 to 80 percent by weight of the film structure, the first layer comprising: (1) from 50 to 85% by weight of a propylene-based copolymer having substantially isotactic propylene sequences, the propylene-based copolymer comprising from 84 to 91 percent by weight units derived from propylene and from about 9 to about 16 percent by weight units derived from ethylene, the propylene-based copolymer having a melt flow rate (MFR) of from 0.1 to 10 g/10 min, a heat of fusion of from 2 to 50 Joules/gram, a molecular weight distribution (Mw/Mn) of less than 4, and a density of from 0.855 to 0.876 g/ml; and (2) from 50 to 15 percent by weight of an linear low density polyethylene copolymer having a melt index (MI) from 0.1 to 10 g/10 minutes and a density of from 0.900 to 0.923 g/ml; and B. A second layer comprising from 10 to 30 percent by weight of the film structure, the second layer comprising: (1) from 55 to 85 percent by weight of a low density polyethylene having a density of from 0.918 to 0.928 g/ml and having a melt index (MI) of from 0.1 to 9; and (2) from 15 to 45 percent by weight of a linear low density polyethylene copolymer having a density of from 0.900 to 0.923 g/ml and a melt index (MI) of from 0.1 to 10 g/10 minutes; and (3) optionally, from 1000 to 20,000 ppm anti-block additive, the film structure exhibiting: (a) a dart impact value of at least 220 g/mil according to ISO 7765-1, (b) an Elmendorf tear strength of at least 115 g/mil in the machine direction according to ASTM D-1922, (c) an Elmendorf tear strength of at least 270 g/mil in the cross direction according to ASTM D-1922, an (d) elastic recovery of at least 78 percent in cross direction after being extended to a strain of 200 percent its original length, and (e) a final holding force in a stretch hood test of at least 700 lbft/inch 2 (after a high stretch (200%-175%) test).