Cycloolefin copolymer heat sealable films

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 61/06 (2006.01) B32B 27/32 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2546382

The present invention relates to a heat-sealable film which consists essentially of a cycloolefin copolymer (COC), the glass transition temperature (Tg) of the COC being within the range from 30 to 55~C. The film or sheet has excellent low temperature heat-sealing properties and processing characteristics. The film may be free standing or laminated to other thermoplastic polymer film or films at low temperatures. Alternatively, a COC polymer with Tg in the range 30 to 55~C may be coextruded with other thermoplastic polymer or polymer films in a coextrusion process to form a heat sealable film. The film of the invention is suitable for packing foods or other consumable items.

La présente invention concerne une pellicule thermoscellable constituée essentiellement d'un copolymère cyclo-oléfine (COC), la température de transition vitreuse (Tg) du COC étant comprise entre 30 et 55 ·C. La pellicule ou la couche possède d'excellentes propriétés de thermoscellage à basse température et caractéristiques de traitement. La pellicule peut être fournie sans support ou sous forme laminée avec une autre pellicule polymère thermoplastique ou des pellicules à basse température. Le polymère COC avec une Tg comprise entre 30 et 55 ·C peut éventuellement être co-extrudée avec un autre polymère thermoplastique ou d'autres pellicules polymères dans un procédé de co-extrusion pour former une pellicule thermoscellable. La pellicule de l'invention convient au conditionnement d'aliments ou d'autres articles de consommation.

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