Bi-directionally oriented multilayer film

A multilayer film comprising:

• an inner layer system comprising a first surface and a second surface;
• a first skin layer bound to the inner layer system at the first surface of the inner layer system;
• and
• a second skin layer bound to the inner layer system at the second surface of the inner layer system;
• wherein
• the inner layer system comprises ≥50.0 wt % with regard to the total weight of the inner layer system of a first ethylene-based polymer being a high-density polyethylene (HDPE) having a density of ≥940 and ≤970 kg/m3, as determined in accordance with ASTM D792 (2008);
• and
• at least one or both of the first or the second skin layer(s) is a sealing layer comprising a second ethylene-based polymer being a linear low-density polyethylene (LLDPE) comprising polymeric moieties derived from ethylene and from 1-hexene or 1-octene, having a density of ≥890 and ≤915 kg/m3, as determined in accordance with ASTM D792 (2008);
• wherein the multilayer film is a bi-directionally oriented film;
• and wherein the orientation in both directions is introduced in the solid state, wherein the second ethylene-based polymer has:
• a fraction eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature of >30° C. and <94.0° C. of ≥90.0 wt %, with regard to the total weight of the second ethylene-based polymer.

A multilayer film comprising:

• an inner layer system comprising a first surface and a second surface;
• a first skin layer bound to the inner layer system at the first surface of the inner layer system;
• and
• a second skin layer bound to the inner layer system at the second surface of the inner layer system;
• wherein
• the inner layer system comprises ≥50.0 wt % with regard to the total weight of the inner layer system of a first ethylene-based polymer being a high-density polyethylene (HDPE) having a density of ≥940 and ≤970 kg/m3, as determined in accordance with ASTM D792 (2008);
• and
• at least one or both of the first or the second skin layer(s) is a sealing layer comprising a second ethylene-based polymer being a linear low-density polyethylene (LLDPE) comprising polymeric moieties derived from ethylene and from 1-hexene or 1-octene, having a density of ≥890 and ≤915 kg/m3, as determined in accordance with ASTM D792 (2008);
• wherein the multilayer film is a bi-directionally oriented film;
• and wherein the orientation in both directions is introduced in the solid state, wherein the second ethylene-based polymer has a fraction that is eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature ≤30.0° C. of ≤8.0 wt %, with regard to the total weight of the second ethylene-based polymer.