Multilayer microporous films and composites for barrier protective materials, and methods

US8283029B2 · kind B2 · utility

Assignee

• Clopay Plastic Products Company, Inc. · US

Inventors

• Gregory K. Jones · Lebanon, US
• Larry H. McAmish · Marietta, US
• Pai-Chuan Wu · Cincinnati, US
• Kenneth L. Lilly · Johnson City, US
• Christopher Shelley · Cincinnati, US
• Mark Andrew Wendorf · Crown Point, US

Key dates

• Filing date: Dec 7, 2009
• Grant date: Oct 9, 2012
• Expiry date: Jul 11, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/674
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Embodiments of a breathable multilayer microporous film comprise a first outer film layer, a second inner film layer, and a third outer film layer, wherein each film layer comprises at least one pore-forming filler and one thermoplastic polymer. Each film layer is rendered microporous and breathable by stretching each film layer having the pore-forming filler therein, wherein the first and third outer film layers have first and third maximum pore sizes, respectively, and the second inner film layer has a second maximum pore size different than the respective maximum pore sizes of the first and third outer film layers of the multilayer film. The multilayer microporous film passes ASTM F 1671-03 test.