초록 ▼

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

Films, made of polyethylenes and filers, and articles made therefrom greater WVTR than previously available films based on conventional Zeigler-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. The films may be used advantageously in composite structures with fabrics (either woven or non-woven) to fabricate such articles as house-wrap

대표청구항 ▼

[ We claim:] [1.]1. A method of preparing a laminate having good water vapor transmission rate (WVTR), said laminate including a filled film and a fabric bonded thereto, said filled film including an effective amount of filler and having a water vapor transmission rate at least 10% higher than the W

[ We claim:] [1.]1. A method of preparing a laminate having good water vapor transmission rate (WVTR), said laminate including a filled film and a fabric bonded thereto, said filled film including an effective amount of filler and having a water vapor transmission rate at least 10% higher than the WVTR described by the equation: WVTR=-10,900+320(filler weight %) and the fabric having an elongation less than 30%, an Elmendorf tear strength of at least 300 g, and a breakload of at least 15 lb./in., the method comprising the steps of:(a) stretching said film to form a stretched film; and(b) bonding said stretched film to said fabric, to form said laminate;(c) wherein said film is a polyethylene film including a metallocene catalyzed polyethylene having a M.sub.w /M.sub.n <3, and a composition distribution breadth index greater than 60%.