초록 ▼

Films, made of polyethylenes and fillers, and articles made therefrom greater WVTR than previously available films based on conventional Ziegler-Natta based polyethylenes. The polyethylenes are produced in a metallocene-catalyzed production process. The films may be made by a cast film process, and

Films, made of polyethylenes and fillers, and articles made therefrom greater WVTR than previously available films based on conventional Ziegler-Natta based polyethylenes. The polyethylenes are produced in a metallocene-catalyzed production process. The films may be made by a cast film process, and may be made in widely varying filler content, generally polyethylene to filler ratios of 30/70 to 70/30. The metallocene based polyethylenes when combined with filler also permit the extrusion of thinner films leading to lighter weight and softer films. The m-polyethylenes utilized for making such films typically have a Composition Distribution Breadth Index above 50%, a M.sub.w /M.sub.n below 3, and a M.sub.z /M.sub.w below 2.

대표청구항 ▼

[We claim:] [1.]a) mixing at least one polyethylene with a filler in a ratio of 10/80 to 80/20;b) extruding a film from the polyethylene/filler mixture of a);c) stretching the film to a sufficient amount to achieve a WVTR at least 10% higher than the WVTR described by the equation: rein said polyeth

[We claim:] [1.]a) mixing at least one polyethylene with a filler in a ratio of 10/80 to 80/20;b) extruding a film from the polyethylene/filler mixture of a);c) stretching the film to a sufficient amount to achieve a WVTR at least 10% higher than the WVTR described by the equation: rein said polyethylene has a Mw/Mn less than 3, and a CDBI greater than 50%.