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Brief description of the polymerisation or copolymerisation of alpha - olefins in the fluidized bed, in the presence of a catalytic system ziegler - natta
Brief description of the polymerisation or copolymerisation of alpha - olefins in the fluidized bed, in the presence of a catalytic system ziegler - natta
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机译:齐格勒-纳塔催化体系存在下流化床中α-烯烃的聚合或共聚简述
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摘要
The present invention relates to a gas phase process for the (co-)polymerization of alpha-olefins in a fluidized bed, by means of a catalyst system of the Ziegler-Natta type consisting of a catalyst (a) comprising magnesium, halogen and transition metal atoms and a cocatalyst (b) consisting of an organometallic compound. The catalyst system is (i) prepared in a granular form, either fixed on a granular support or converted into a prepolymer, (ii) then subjected to a treatment by a polymerization inhibiting agent in the absence of alpha-olefins, and then (iii) brought into contact with alpha-olefins under (co-)polymerization conditions in the fluidized bed, in the presence of a cocatalyst (c) consisting of an organometallic compound, identical or different from the cocatalyst (b).
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