MULTILAYER FILM WITH LINEAR TEAR ABILITY Russian patent published in 2017 - IPC B32B27/08 B32B27/32 C08L23/06 C08J5/18 

FIELD: chemistry.

SUBSTANCE: multilayer film is described with a sequence of (a) a layer (a) based on at least one low density polyethylene (LDPE) of 0.915 to 0.930 g/cm³ or on a mixture of (α) of at least one low density polyethylene (LDPE) of 0.915 to 0.930 g/cm³, and (β) at least one homo- or copolymer of acyclic C₂-C₆ olefin other than the polyethylene component (α), (b) a layer (b) based on a mixture of at least one low density polyethylene (LDPE) of 0.915 to 0.930 g/cm³ and at least one cycloolefin copolymer which is a copolymer of C₆-C₁₂ cycloolefin and C₂-C₄ olefin, and (c) a layer (c) based on at least one low density polyethylene (LDPE) of 0.915 to 0.930 g/cm³ or on a mixtures of (α) at least one low density polyethylene (LDPE) of 0.915 to 0.930 g/cm³ and (β) at least one homo- or copolymer acyclic C₂-C₆ olefin other than the polyethylene component (α), wherein layer (a), respectively, layer (b) have a thickness of 5 to 25 microns, and layer (c) has a thickness of 5 to 30 microns, and the tearing force of the multilayer film in the longitudinal direction and transverse direction is maximum 1000 mN each, and the ratio of its tearing force in the longitudinal direction and tearing force in the transverse direction is 2:1 to 1:2, in each case when tested by the Elmendorf method in accordance with DIN EN ISO 6383-2 standard. Also, multilayer film application as a packaging material, protective or release film and protective or release film are described mainly for adhesive tapes.

EFFECT: improved film properties.

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