PROCESS
A process for the preparation of a propylene homopolymer in a multistage polymerisation process in the presence of a single site catalyst, said process comprising: (I) in a slurry polymerisation step, polymerising propylene in the presence of said single site catalyst; and subsequently (II) in a gas...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | A process for the preparation of a propylene homopolymer in a multistage polymerisation process in the presence of a single site catalyst, said process comprising:
(I) in a slurry polymerisation step, polymerising propylene in the presence of said single site catalyst; and subsequently
(II) in a gas polymerisation step polymerising propylene in the presence of catalyst and polymer from step (I) so as to form a propylene homopolymer;
wherein said catalyst comprises
(i) a metallocene complex of a Group 4 metal, said metallocene comprising at least two cyclopentadienyl type ligands;
(ii) a boron based cocatalyst; and
(iii) an aluminoxane cocatalyst;
said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier. |
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