Metal layer-free multi-layer film with low surface weight

摘要

A metal layer-free multi-layer film with a surface weight of ≦33 g/m2, shrinkage behavior of ≦10% at 90° C. as described herein and a layer structure: a layer (a) composed of at least one thermoplastic olefin homopolymer or copolymer as an outer layer, an adhesive layer (b) inseparable under a cohesion peeling effect, a layer (c) of at least one homopolyamide and/or copolyamide, at least one internal gas barrier layer (d) adjoining layer (c) and differing from layers (c) and (e) in the composition of the polymer component(s), a layer (e) adjoining the gas barrier layer (d) and composed of at least one homopolyamide and/or copolyamide, and a layer (i) of at least one homopolyamide and/or copolyamide as an outer layer. Also disclosed is a method of using such a multi-layer film for the production of a buoyancy/lift body and a buoyancy/lift body made of such a multi-layer film.

主权项

1. A metal-layer-free multilayer film with a weight per unit area of ≦33 g/m2 and with an at least six-layer structure comprising:
(a) a layer (a) composed of at least one thermoplastic olefin homo- or copolymer, as one of the external layers; (b) a non-peelable adhesion-promoter layer (b) optionally having a plurality of sublayers; (c) a layer (c) composed of at least one homo- and/or copolyamide and optionally having a plurality of sublayers; (d) at least one internal gas-barrier layer (d) which adjoins the layer (c) and which optionally has a plurality of sublayers and which differs at least in the composition of the polymer component(s) from the layer (c) and a layer (e); (e) the layer (e) which adjoins the gas-barrier layer (d) and which optionally has a plurality of sublayers and is composed of at least one homo- and/or copolyamide; and (i) a layer (i) composed of at least one homo- and/or copolyamide as one of the external layers; wherein shrinkage of the multilayer film, determined as dimensional change in accordance with DIN 53377, is ≦10% at 90° C., both in machine direction and perpendicular to the machine direction, where the multilayer film comprises no metal foil and no vapor-deposition layer made of a metal or of a metal compound.