Patent ID: 8779067

Claim:
A co-oligomer having an Mn of 300 to 30,000 g/mol (measured by 1 H NMR) comprising 10 to 50 mol % propylene and 50 to 90 mol % of ethylene, wherein the co-oligomer has at least X % allyl chain ends (relative to total unsaturations), where: 1) X=1.20*(−0.94*(mole % ethylene incorporated)+100), when 50 to 60 mole % ethylene is present in the co-oligomer, and 2) X=45, when greater than 60 and less than 70 mole % ethylene is present in the co-oligomer, and 3) X=(1.83*(mole % ethylene incorporated)−83), when 70 to 90 mole % ethylene is present in the co-oligomer; wherein the co-oligomer has been functionalized by reacting a heteroatom containing group with the co-oligomer, with or without catalyst.