Process for preparing an in situ polyethylene blend

Details Process for preparing an in situ polyethylene blend Process for preparing an in situ polyethylene blend

C - Chemistry, Metallurgy

08

L

402/611, 402/640

C08L 23/06 (2006.01) C08F 4/64 (2006.01) C08F 10/00 (2006.01) C08F 210/16 (2006.01) C08F 4/619 (2006.01) C08F 4/6192 (2006.01)

Patent

CA 2188722

A process for the production of an in situ polyethylene blend comprising contacting at least one metallocene based catalyst system with one or more alpha-olefins in each of two or more reactors connected in series, in the gas phase, under polymerization conditions, with the provisos that: (a) ethylene is introduced into each reactor; (b) optionally, an alpha-olefin having at least 3 carbon atoms or a diene is introduced into at least one reactor; (c) - the mixture of ethylene polymer matrix and catalyst formed in the first reactor in the series is transferred to the subsequent reactors in the series;and (d) the polymerization conditions in each reactor are such that a high molecular weight polymer is formed in at least one reactor and a low molecular weight polymer is formed in at least one other reactor.

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