POLYMERISATION METHOD Russian patent published in 2016 - IPC C08F10/02 C08F10/06 C08F210/02 C08F210/06 C08F2/00 C08F2/34 

FIELD: chemistry.

SUBSTANCE: described is a method of transitioning T1 from a process of polymerising ethylene or propylene, conducted in a polymerisation reactor in the presence of a catalyst a1, ethylene or propylene and optionally an olefin comonomer A1, to obtain an ethylene polymer or a propylene polymer P1, to a process of polymerising ethylene or propylene, conducted in the same polymerisation reactor in the presence of a catalyst a2, ethylene or propylene and optionally an olefin comonomer A2, to obtain an ethylene polymer or a propylene polymer P2. The catalysts a1 and a2 are different and compatible. The catalysts a1 and a2 are both active and are present in the reactor during at least part of the transition T1 from obtaining P1 to obtaining P2. The transition T1 is continuous.

EFFECT: reduced amount of off-grade material obtained during the transition.

13 cl, 2 ex