Process for producing propylene based oligomers.

摘要

A process for producing a propylene based oligomer which comprises polymerizing propylene alone or propylene and an olefin other than propylene in the presence of a catalyst comprising: (A) a transition metal compound represented by the general formula (I): (R5C5)mMX4-m (I> wherein R5C5 may be the same as or different from each other and is a hydrocarbon group-substituted cyclopentadienyl group; M is a zirconium atom or hafnium atom; X may be the same as or different from each other and is a hydrogen atom, halogen atom or hydrocarbon group; m is an integer of from 1 to 4; and (B) a compound capable of forming an ionic complex when reacted with a transition metal compound, is disclosed. According to the present invention, a propylene oligomer can be produced without using a promotor such as aluminoxane or with use of a small amount of an organoaluminum compound. Therefore, according to the present invention, such propylene based oligomers can be produced at reduced cost with use of the process comprising a simplified deashing step.