C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 4/654 (2006.01) C08F 10/00 (2006.01)
Patent
CA 2124572
2124572 9311164 PCTABS00022 In the invention a particular procatalyst composition intended for the polymerization of olefins is prepared by reacting the carrier particles consisting of a MgCl2-C2H5OH-complex with TiCl4. When the method is applied into pilot-scale it was noticed that the procatalyst composition obtained produced olefin polymer, the finely-divided material portion of which was deterioratingly high. This was caused by the fact that the procatalyst composition particles had decomposed to finely-divided material during the synthesis, which was then in the polymerization repeated in the polymer structure due to the so-called replica phenomenon. In the invention it has unexpectedly been noticed that the breaking of the carrier particles is not a result of e.g. mechanical strain but of the fact that when the carrier particles react with the TiCl4 a heavy discharge of hydrogen chloride is first occurring as a result of the reaction which breaks the carrier particles. The carrier particles can, according to the invention, be maintained undamaged during the reaction by distributing the release in the reaction or from the reaction of the hydrogen chloride created in the reaction to a molar velocity not exceeding the fivefold value of the molar mean velocity of the release. This is achieved among other things by adding reagents unusually slowly, by using lower temperatures and heating velocities, by intensifying the agitation, by using an overpressure and/or by conducting diluting inert gas into the reaction mixture.
Garoff Thomas
Koskinen Jukka
Borealis Holding A/s
Oyen Wiggs Green & Mutala Llp
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