Patent ID: 6891002

Claim:
A process for producing a polyolefin, the process comprising (co)polymerizing one or two or more α-olefins in a vapor phase in a fluidized-bed reactor, wherein the concentration of (A) a saturated aliphatic hydrocarbon in the fluidized bed reactor is 1 mol % or more and at least one compound selected from (B) an aliphatic amide and (C) a nonionic surfactant constituted only of carbon, oxygen and hydrogen atoms is made to exist in the reactor, wherein fluidizing gas is introduced at a flow rate so as to maintain the fluidized bed of the fluidized bed reactor in a fluidizing state by the gas, and the amount of said gas is 3U mf to 50U mf , wherein U mf is the minimum fluidizing rate of the fluidized bed.