METHOD OF CONTROLLING BIMODAL CATALYST ACTIVITY DURING POLYMERISATION Russian patent published in 2013 - IPC C08F2/34 C08F10/00 

FIELD: chemistry.

SUBSTANCE: method of conducting a polymerisation reaction in a gas phase polymerisation reactor to obtain a bimodal polymer while controlling activity of a bimodal polymerisation catalyst composition in the reactor by controlling concentration of at least one induced condensing agent (ICA) in the reactor. The ICA is hexane, isohexane, pentane, isopentane, butane, or isobutane, and the bimodal catalyst composition includes a Group 15 and metal containing catalytically active compound (HMW catalyst for catalysing polymerisation of a high molecular weight fraction of the product), and a metallocene catalytically active compound (LMW catalyst for catalysing polymerisation of a low molecular weight fraction of the product).

EFFECT: method enables to control activity of at least one of the catalyst components included in the catalyst composition during the polymerisation reaction, meant for producing a bimodal polymer in order to control molecular weight distribution of said polymer.

12 cl, 5 dwg, 1 ex