Patent ID: 8394897

Claim:
A method for preparing a vinylidene terminated polyolefin comprising: (a) generating an ionized polyolefin in the presence of a Lewis acid; (b) reacting the ionized polyolefin from step (a) with one or more dihydrocarbylmonosulfides having the following formula: R 1 —S—R 2 wherein R 1 and R 2 are each, independently, hydrocarbyl, wherein the dihydrocarbylmonosulfides are added to the polymer after polymerization has occurred; and (c) reacting the product of step (b) with one or more proton acceptor compounds; wherein a vinylidene terminated polyolefin is formed and the vinylidene terminated polyolefin formed is at least 40 percent by mole of all products; wherein the method is performed at a temperature from about −120° C. to about 0° C.