Blends of linear low density polyethylenes

A polyethylene blend comprising a uniform dispersion of constituents (A) and (B):

• (A) a Ziegler-Natta catalyst-made linear low density polyethylene (ZN-LLDPE) and (B) a metallocene catalyst-made linear low density polyethylene (MCN-LLDPE);
• wherein the (A) ZN-LLDPE is from 25 to 50 weight percent (wt %) of the total weight of (A) and (B) and the (B) MCN-LLDPE is from 75 to 50 wt % of the total weight of (A) and (B);
• wherein by itself (A) independently has each of properties (i) to (iii):
• (i) a melt index (“I2”, 190° C., 2.16 kg) of 0.9 to 1.1 gram per 10 minutes (g/10 min.) measured according to ASTM D1238-04;
• (ii) a density of 0.918±0.003 gram per cubic centimeter (g/cm3), measured according to ASTM D792-13;
• and (iii) no detectable amount of long chain branching per 1,000 carbon atoms (“LCB Index”), measured according to LCB Test Method;
• and wherein by itself (B) independently has each of properties (i) to (iii):
• (i) a melt index (“I2”, 190° C., 2.16 kg) of 0.9 to 1.1 g/10 min. measured according to ASTM D1238-04;
• (ii) a density of 0.918±0.003 g/cm3, measured according to ASTM D792-13;
• and (iii) no detectable amount of long chain branching per 1,000 carbon atoms (“LCB Index”), measured according to LCB Test Method;
• and with the proviso that the density of constituent (B) is within ±0.001 g/cm3 of the density of constituent (A);
• wherein the (A) ZN-LLDPE is made by copolymerizing ethylene and 1-hexene in the presence of the Ziegler-Natta catalyst and the (B) MCN-LLDPE is made by copolymerizing ethylene and 1-hexene in the presence of the metallocene catalyst;
• and
• wherein the melt index (“I2”, 190° C., 2.16 kg) of constituent (B) is within ±0.1 g/10 min. of the melt index (“I2”, 190° C., 2.16 kg) of constituent (A);
• and
• wherein when formed as a film having a thickness of 0.0127 millimeter the film has a puncture resistance, measured according to ASTM D5748-95(2012), of at least 24.8 Joules per cubic centimeter (J/cm3).