Patent ID: 8399725

Claim:
A functionalized co-oligomer comprising the reaction product of 1) a heteroatom containing group, and 2) a co-oligomer having an Mn of 300 to 30,000 g/mol (measured by 1 H NMR) and comprising 50 to 90 mol % propylene and 10 to 50 mol % of ethylene, wherein the co-oligomer has at least X % allyl chain ends (relative to total unsaturations) prior to functionalization, where X=(−0.94*(mole % ethylene incorporated)+100), when 10 to 50 mole % ethylene is present in the co-oligomer, where the heteroatom containing group comprises one or more heteroatoms selected from the group consisting of P, O, S, N, Br, Cl, F, I and B, and the functionalized co-oligomer has 0.75 to 1.10 functional groups per chain.