Heat shrinkable multilayer film and packaging material using...

Details Heat shrinkable multilayer film and packaging material using... Heat shrinkable multilayer film and packaging material using...

B - Operations, Transporting

32

B

B32B 27/34 (2006.01) B32B 27/28 (2006.01) B65D 65/40 (2006.01)

Patent

CA 2642503

Disclosed is a heat shrinkable multilayer film comprising an outer surface layer (a) composed of a thermoplastic resin, a first intermediate layer (b1) composed of a polyamide resin, a second intermediate layer (b2) composed of a saponified ethylene-vinyl acetate copolymer, and an inner surface layer (c) composed of a polyolefin resin. This heat shrinkable multilayer film is characterized in that the hot water shrinkage rates of the heat shrinkable multilayer film in the machine direction and the transverse direction at 90~C are respectively within the range of 3-45%; and the polyamide resin is a mixture of 60-90% by mass of an aliphatic polyamide having a melting point of not less than 210~C and 10-40% by mass of an aromatic polyamide mainly composed of isophthalic acid and terephthalic acid.

L'invention concerne un film multicouche thermorétractable comprenant une couche de surface externe (a) composée d'une résine thermoplastique, une première couche intermédiaire (b1) composée d'une résine de polyamide, une seconde couche intermédiaire (b2) composée d'un copolymère d'éthylène-acétate de vinyle saponifié et une couche de surface interne (c) composée d'une résine de polyoléfine. Ce film multicouche thermorétractable est caractérisé en ce que les taux de retrait dans de l'eau chaude du film multicouche thermorétractable dans le sens machine et dans le sens transversal à 90°C sont compris dans la plage de 3-45 %, respectivement ; et en ce que la résine de polyamide est un mélange de 60-90 % en masse d'un polyamide aliphatique ayant un point de fusion supérieur ou égal à 210°C et de 10-40 % en masse d'un polyamide aromatique principalement composé d'acide isophtalique et d'acide téréphtalique.

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