Biaxially-oriented polypropylene films

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/00 (2006.01) B29C 55/14 (2006.01) B32B 27/32 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2189563

A biaxially-oriented polypropylene (BOPP) film with improved barrier properties, and a method of making the film are provided. The MVTR of a multi- layer BOPP film is improved by blending wax in the core layer resin, and providing a polyolefin cap layer on each side of the core layer. Significant additional improvements are seen when the film is heated at a temperature below the meltingpoint of the core layer resin, below the distortion temperature of the film, andabove the melting point of the wax for a time generally extending from at least five minutes to several hours or more in length, depending on the temperature.

Cette invention concerne une pellicule de polypropylène orientée bi-axialement possédant des propriétés de barrage accrues, ainsi qu'un procédé de fabrication de ladite pellicule. On peut améliorer le taux d'échange de vapeur d'eau d'une pellicule multicouche de polypropylène orientée bi-axialement en mélangeant de la cire à la résine de la couche centrale, et en appliquant une couche d'encapsulation de polyoléfine sur chaque face de la couche centrale. On assiste également à des améliorations supplémentaires sensibles lorsque la pellicule est chauffée à une température inférieure à celle du point de fusion de la résine de la couche centrale et à celle de distorsion du film, mais supérieure à celle du point de fusion de la cire. La pellicule peut être chauffée pendant une période allant généralement d'au moins cinq minutes à plusieurs heures ou plus en fonction de la température.

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