FIELD: chemistry.
SUBSTANCE: described is a method which involves gas-phase polymerisation of an olefin monomer in more than one polymerisation zone in the presence of a Ziegler-Natta catalyst containing a solid titanium-containing component deposited on magnesium, a cocatalyst - alkylaluminium and organosilane as an external electron donor. The method involves feeding the titanium-containing component and alkylaluminium into a first polymerisation zone and then feeding an additional amount of alkylaluminium into the next polymerisation zone without adding the titanium-containing component.
EFFECT: stepwise addition of the cocatalyst - alkylaluminium - increases output during the second step, which results in more uniform distribution of products between the two steps.
11 cl, 2 tbl, 18 ex
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