Inventors:
John A. Larter - Canandaigua NY
Robert V. Poirier - Fairport NY
Assignee:
ExxonMobil Oil Corporation - Fairfax VA
International Classification:
C08F 1014
US Classification:
5263485, 428500, 428515, 428516, 4283044, 4283073, 4283084, 428910, 264901, 264902, 264903, 264299
Abstract:
A high density polyethylene (HDPE) film is provided having high-biaxial orieniation. The film includes HDPE having a density of at least about 0. 940, and a melt index of from about 0. 5 to about 10. The film is stretched in the machine (longitudinal) direction to a degree of from about 5:1 to about 8:1, preferably from about 6:1 to about 7:1. The film is also stretched in the transverse (lateral) direction to a degree of from about 6:1 to about 15:1, preferably from about 9:1 to about 13:1. Preferably, the film has an orientation imbalance, with a higher degree of transverse orientation than machine orientation. Skin layers such as heat seal layers can be provided. Preferably, the film contains one or more layers of a casting promoter material employed to promote casting of a high gauge HDPE sheet subsequently high biaxially oriented to provide the film. The film can also be cavitated, or otherwise modified (e. g. , corona-treated, coated, metallized, etc.
