POLYMERISATION CATALYSTS, METHODS FOR PRODUCTION AND USE THEREOF AND POLYOLEFIN PRODUCTS OBTAINED USING SAME Russian patent published in 2014 - IPC C08F4/646 C08F10/02 C08F4/6592 

FIELD: chemistry.

SUBSTANCE: invention relates to catalyst systems for polymerising olefins, which contain a catalytic, high-molecular weight compound and a catalytic, low-molecular weight compound, a method for production thereof, a method of polymerising olefins, an ethylene polymer and an article made from the ethylene polymer. The high-molecular weight catalysts include metallocene catalysts. The second catalyst component has formula I (values of radicals are given in the claim). The second catalyst component is present in an amount of 0.001-5.0 mol % with respect to said first catalyst component. Said first catalyst component enables to obtain a polymer with weight-average molecular weight (Mw) of 40000-200000 g/mol, and the second catalyst component enables to obtain a polymer with Mw higher than 1000000 g/mol. The obtained ethylene polymer has at least one of the following properties: (a) melt strength greater than 6*MI^-0.6675, (b) ratio of longitudinal viscosity, measured at rate of extension of 1 s^-1, 190°C and exposure time of 4 s, to viscosity predicted based on linear viscoelastic properties for the same temperature and exposure time, greater than 3; (c) activation energy (Ea) less than 7 kcal/mol/K; (d) ratio Mz/Mw greater than the ratio Mw/Mn, where Mz is the z-average molecular weight of said polymer, Mw is the weight-average molecular weight of said polymer, Mn is the number-average molecular weight of said polymer; and (e) Van Gurp-Palmen plot, having a positive slope and having a maximum, wherein the Van Gurp-Palmen plot is a curve of phase shift versus the magnitude of the complex shear modulus, determined based on dynamic rheological properties, more specifically based on frequency sweep in the range of 0.01-100 rad/s at 190°C.

EFFECT: obtaining bimodal compositions which are easy to process and have improved properties.

28 cl, 7 dwg, 12 tbl, 44 ex