Polyethylene composition and film having retained dart impact

A polyethylene composition comprising:

• from 15 to 75 wt % of a first polyethylene which is an ethylene copolymer, the first polyethylene having a weight average molecular weight Mw of from 70,000 to 250,000, a molecular weight distribution Mw/Mn of <2.3 and from 5 to 100 short chain branches per thousand carbon atoms;
• from 5 to 80 wt % of a second polyethylene which is an ethylene copolymer or an ethylene homopolymer, the second polyethylene having a weight average molecular weight Mw of less than 75,000, a molecular weight distribution Mw/Mn of <2.3 and from 0 to 20 short chain branches per thousand carbon atoms;
• and
• from 5 to 60 wt % of a third polyethylene which is an ethylene copolymer or an ethylene homopolymer, the third polyethylene having a weight average molecular weight Mw of from 100,000 to 300,000, a molecular weight distribution Mw/Mn of >2.3 and from 0 to 75 short chain branches per thousand carbon atoms;
• wherein
• the number of short chain branches per thousand carbon atoms in the first polyethylene (SCBPE-1) is greater than the number of short chain branches per thousand carbon atoms in the second polyethylene (SCBPE-2) and the third polyethylene (SCBPE-3);
• the number of short chain branches per thousand carbon atoms in the third polyethylene (SCBPE-3) is greater than the number of short chain branches per thousand carbon atoms in the second polyethylene (SCBPE-2);
• and
• the weight average molecular weight of the second polyethylene is less than the weight average molecular weight of the first polyethylene and the third polyethylene;
• wherein,
• the polyethylene composition has a density of ≤0.939 g/cm3, a melt index I2, determined at 190° C., of from 0.1 to 10 dg/min, a melt flow ratio, I21/I2 of greater than 40 and has a soluble fraction in a crystallization elution fractionation (CEF) analysis of at least 15 weight percent.