Composite polyester films with barrier properties

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 7/04 (2006.01) B32B 27/36 (2006.01) C09D 129/04 (2006.01)

Patent

CA 2295857

The invention concerns composite polyester films with good barrier properties relative to gases. More precisely, it concerns a biaxially drawn film, based on polyester and having improved barrier properties relative to gases, characterised in that it comprises a base polyester film of 5 to 50 µm, coated on one of its two surfaces with a deposit containing polyvinyl alcohol and a water dispersible copolyester with sulphonyloxy units, said composite film having permeability to oxygen measured at 23 ~C under 50 % relative humidity, not more than 5 cm3/m2/24h. Said composite films have, besides being transparent and having barrier properties, excellent resistance to mechanical stresses, such as in particular crumpling.

La présente invention concerne des films composites à base de polyester ayant de bonnes propriétés barrière vis-à-vis des gaz. Plus précisément, elle concerne un film composite étiré biaxialement, à base de polyester et ayant des propriétés barrière vis-à-vis des gaz améliorées, caractérisé en ce qu'il comporte un film de base en polyester ayant de 5 µm à 50 µm, revêtu sur l'une de ses deux faces par une couche comportant de l'alcool polyvinylique et un copolyester hydrodispersable à motifs sulfonyloxy, ledit film composite présentant une perméabilité à l'oxygène mesurée à 23 ·C sous 50 % d'humidité relative, inférieure ou égale à 5 cm?3¿/m?2¿/24 h. Les films composites de l'invention présentent, outre leur transparence et leurs propriétés barrière, une excellente résistance aux agressions mécaniques, telles que notamment le froissage.

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