MULTILAYER FILM WITH HIGH TEAR PROPAGATION RESISTANCE AND LOW SHRINKAGE

摘要

Multilayer film with high tear propagation resistance of at least 300 mN for a total layer thickness of 45 μm, a shrinkage of ≦1% at 120° C. and release properties, comprising a layer (a) formed of at least one propylene copolymer and optionally at least one olefin homopolymer, at least one internal layer (b) formed of at least one olefin/alkyl (meth)acrylate copolymer, a layer (c) formed of at least one propylene copolymer and optionally at least one olefin homopolymer with optional adhesion layers (d) and (e) arranged between layers (a) and (b), and between layers (b) and (c) respectively.

主权项

1. A multilayer film with a tear propagation resistance of at least 300 mN measured by the Elmendorf method (ISO 6383-2) on a multilayer film of total thickness 45 μm and with % shrinkage in accordance with DIN 53377 for 1 min of residence time in the oil bath at 120° C. (in both MD and CD) with release properties, comprising
(a) a layer formed of at least propylene copolymer and optionally at least one olefin homopolymer (b) at least one internal layer formed of at least one olefin/alkyl (meth)acrylate copolymer (c) a layer formed of at least one propylene copolymer and optionally at least one olefin homopolymer and
optionally a layer (d) arranged between the layer (a) and the layer (b) and/or a layer (e) arranged between the layer (b) and the layer (c), as an adhesion-promoter layer, wherein at least one of the surface layers of the multilayer film is provided with release properties.