High activity, low molecular weight olefin polymerization process

An interpolymer of propylene, ethylene, and optionally, a diene, and wherein the interpolymer comprises 65 percent or more polymerized propylene, and wherein the interpolymer is made by a process comprising the following:

• copolymerizing propylene, ethylene, and optionally a diene, at a temperature from 100 to 130° C., a pressure from 100 KPa to 10 MPa, and a propylene/hydrogen flow ratio (g propylene/hr:g H2/hr) from 5000 to 50,000 in the presence of a metal complex corresponding to the formula:
• wherein, X is an anionic ligand group;
• and
• covalent bonds are represented by lines and coordination interactions are represented by arrows;
• and
• wherein said interpolymer has a Mw from 50,000 to 150,000, a molecular weight distribution Mw/Mn from 2.0 to 10, a density from 0.860 to 0.885, an ethylene content from 5 to 15 weight percent, an isotacticity (percent mm) of at least 90, ΔHfusion from 25 to 55 J/g;
• a Tc between 50° C. and 58.7° C., and a B-value from 1.03 to 1.09.