Patent ID: 7323611

Claim:
A process for producing an olefin oligomer, which comprises the steps of: (1) contacting an olefin with an organoaluminum compound, thereby producing a contact product (i); (2) contacting a transition metal compound with a compound represented by the following formula (1), thereby producing a contact product (ii); and (3) contacting the contact product (i), the contact product (ii), an alumoxane compound, and optionally an olefin with one another; R 1 R 2 A-G-AR 3 R 4 (1) wherein A is a nitrogen atom, a phosphorus atom, an arsenic atom or an antimony atom, and As are the same as or different from each other; G is a divalent group; and R 1 , R 2 , R 3 and R 4 are independently of one another a hydrocarbyl group, a halogenated hydrocarbyl group, an oxygen-containing hydrocarbyl group, a sulfur-containing hydrocarbyl group, a selenium-containing hydrocarbyl group, or a tellurium-containing hydrocarbyl group.