Stretchable multilayer films

B - Operations – Transporting – 32 – B

Patent

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B32B 27/32 (2006.01)

Patent

CA 2262901

Stretchable multilayer films in which at least one outer layer (A) comprises a linear low density polyethylene (LLDPE), at least one intermediate layer (B) comprises a polyolefin composition containing LLDPE and a propylene polymer having an insolubility in xylene higher than 70 %, and at least another layer (C) comprises a very low density polyethylene (VLDPE). Said films show an excellent balance between mechanical properties, represented as tear resistance and strength at break, and optical properties represented as gloss and haze.

L'invention concerne des films étirables multicouches, selon lesquels au moins une couche extérieure (A) comprend un polyéthylène à basse densité (LLDPE), au moins une couche intermédiaire (B) comprend une composition de polyoléfine, contenant du LLDPE et un polymère de propylène insoluble dans le xylène à plus de 70 %, et au moins une autre couche (C) comprend un polyéthylène à très basse densité (VLDPE). Ces films présentent un excellent équilibre entre les différentes propriétés mécaniques telles que la résistance au déchirement et la résistance à la rupture, et des propriétés optiques telles que le brillant et le trouble.

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