Polyethylene based laminated film structure with barrier properties

A laminated polyethylene based film structure having barrier properties, the laminated polyethylene based film structure comprising

• (1) one oriented first film comprising:
• a) at least one layer A based on a polyethylene polymer having a density of from 890 to 980 kg/m3, and
• b) at least one layer B, wherein layer B comprises:
• a high density polyethylene (HDPE) having a density of from 940 to 970 kg/m3, a medium density polyethylene (MDPE) having a density of from 925 to 940 kg/m3, or a linear low density polyethylene (LLDPE) having a density of 910 up to 950 kg/m3,
• wherein the oriented first film:
• is at least oriented in machine direction (MDO film) in a draw ratio of from 1:1.5 to 1:12 and has a film thickness after orientation of from 10 to 50 μm, and
• has one surface that is coated by a thin vapor deposited barrier ceramic or metal layer, such that the oriented first film has a coated surface having a thickness of from 5 nanometers (nm) to 200 nm;
• and
• (2) a second film laminated onto the coated surface of the oriented first film, wherein the second film comprises
• c) at least one sealant layer C based on a polyethylene polymer, and
• d) optionally a high density polyethylene (HDPE) barrier layer D, and
• wherein polymers other than ethylene based polymers are substantially absent from the laminated polyethylene based film structure.