Medium density polyethylene film layer and multilayer film comprising same

A multilayer film structure comprising (a) a core layer having a first side and a second side, said core layer comprising at least one core polymer;

• (b) a first tie layer having a first side and a second side, the second side of the first tie layer on the first side of said core layer, said first tie layer comprising an impact copolymer and, optionally, a tie layer polymer, the optional tie layer polymer comprising at least one of a C2 to C8 alpha-olefin homo-, co-, or terpolymer, a metallocene catalyzed homo-, co-, or terpolymer comprising propylene, and blends thereof;
• (c) a second tie layer having a first side and a second side, the first side of the second tie layer on the second side of said core layer, said second tie layer comprising a tie layer polymer comprising at least one of a C2 to C8 alpha-olefin homo-, co-, or terpolymer, a metallocene catalyzed homo-, co-, or terpolymer comprising propylene, and blends thereof;
• (d) a sealant skin layer having a side on the first side of the first tie layer, said sealant skin layer comprising a blend of from 25 wt % to 75 wt % of a polyethylene polymer having a density of from 0.910 g/cm3 to 0.950 g/cm3, from 25 wt % to 75 wt % C2 to C6 random copolymer or terpolymer and from 0.3 wt % to 1 wt % antiblock agent;
• and (e) a second skin layer having a side on the second side of the second tie layer, said second skin layer comprising a polymer selected from the group consisting of polyethylene (PE), polypropylene (PP), ethylene-propylene (EP) copolymer, propylene-butylene (PB) copolymer, ethylene-propylene-butylene (EPB) terpolymer, ethylene-vinyl alcohol (EVOH) polymer, and blends thereof.