| 摘要 |
PURPOSE: Provided is a polyolefin while decreasing the formation of gel and/or oligomer by carrying out the vapor-phase polymerization of at least one olefin or diolefin monomer in the presence of a vanadium catalyst while adding a sacrifice monomer or a Lewis base to the system. CONSTITUTION: A polyolefin is produced by the vapor-phase polymerization of (A) an olefin or diolefin monomer in the presence of (B) a vanadium catalyst system and (C) an inert granular substance while adding (a) a sacrifice monomer preferably selected from (di)olefinic hydrocarbons, vinyl aromatic compounds, or the like, or (b) a Lewis base preferably selected from ethers, alcohols, ketones, carboxylic acids, esters, and the like, to the system. The sacrifice monomer is preferably (ethylidene)norbornene, or the like, and the component E is preferably isopropanol, butylamine, di-t-butylphenol, and the like.
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