Multilayer polyamide film structures

B - Operations – Transporting – 32 – B

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B32B 27/32 (2006.01) B29C 47/06 (2006.01) B32B 27/34 (2006.01)

Patent

CA 2257724

Coextruded films having a one inner core layer of polyamide homopolymer or copolymer, and an outer layer on each side of the polyamide core of a blend of a polyolefin homopolymer or copolymer and an adhesive composition which comprises a polyolefin having at least one functional moiety of an unsaturated carboxylic acid and/or anhydride thereof. The coextruded films are typically prepared by a blown film technique. Such structures are suitable for use as release and barrier films for sheet molding and other reinforced plastic applications.

Complexe formé par co-extrusion qui possède un noyau interne sous forme de couche en homopolymère ou en copolymère polyamidiques et des couches externes, placées de chaque côté du noyau polyamidique et composées d'un mélange d'un homopolymère ou d'un copolymère polyoléfiniques et d'une composition adhésive qui comprend un polyoléfine possédant au moins une fraction d'un acide carboxylique non saturé et/ou d'un anhydride dudit acide. En règle générale, les complexes formés par co-extrusion sont obtenus par soufflage. Les structures décrites peuvent être utilisées comme des films barrières ou des films libérables dans des applications utilisant des mélanges à mouler en feuille ou d'autres plastiques renforcés.

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