PRECATALYST FOR PREPARING ETHYLENE POLYMERS, PROCESS FOR PREPARATION AND USE THEREOF Russian patent published in 1999 - IPC

FIELD: chemistry of polymers. SUBSTANCE: precatalyst comprises inorganic carrier and chlorine, magnesium and titanium compounds on said carrier. Activity balance (AB) of precatalyst is determined by expression of AB of more than 3,2: wherein A is polymerization activity in kt PE/g cat.h; MFR₂ is melt flow rate in g/min at load of 2.16 kg by ISO 1133, absence of upper index (') means polymerization at low melt flow rate, presence of upper index (') means polymerization at high mell flow rate. Said compounds improve effectiveness of polymerizing catalyst, duration of its use and other properties of catalyst mixture, and primarily properties of polymer prepared using said catalyst mixture. EFFECT: improved properties of the precatalyst. 40 cl, 5 ex, 1 dwg, 2 tbl