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AN IMPROVED PROCESS FOR POLYMERISATION OR COPOLYMERISATION OF ETHYLENE AND AT LEAST ONE OTHER ALPHA-OLEFIN IN THE GAS PHASE IN THE PRESENCE OF A CATALYST ON CHROMIUM OXIDE
AN IMPROVED PROCESS FOR POLYMERISATION OR COPOLYMERISATION OF ETHYLENE AND AT LEAST ONE OTHER ALPHA-OLEFIN IN THE GAS PHASE IN THE PRESENCE OF A CATALYST ON CHROMIUM OXIDE
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机译:氧化铬存在下气相中乙烯和至少一种其他烯烃的聚合或共聚反应的改进方法
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摘要
pThe present invention relates to a process for starting up the polymerization of ethylene or copolymerization of ethylene and at least one other alpha-olefin by bringing ethylene and optionally at least one other alpha-olefin in contact under fluidized-bed polymerization or copolymerization conditions and/or stirred mechanically, with a charge powder in the presence of a catalyst comprising a chromium oxide compound associated with a granular support and activated by thermal treatment, this catalyst being used in the form of a prepolymer, this process being characterized in that the charge powder employed is previously subjected to a treatment by contacting the said charge powder with an organo-aluminium compound, in such a way that the polymerization or copolymerization starts up immediately after the contacting of the ethylene and optionally one other alpha-olefin with the charge powder in the presence of the prepolymer./p[US5075395A]
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