POLYETHYLENE AND CATALYST COMPOSITION FOR POLYETHYLENE SYNTHESIS Russian patent published in 2010 - IPC C08L23/04 C08F110/02 C08F210/16 C08F4/6592 C08F4/80 

FIELD: chemistry.

SUBSTANCE: polyethylene in form of ethylene homopolymers and copolymers of ethylene with α-olefins and having molecular weight distribution range M_w/M_n from 6 to 100, density from 0.89 to 0.97 g/cm³, weight-average molecular weight M_w from 5000 g/mol to 700000 g/mol and from 0.01 to 20 branches/1000 carbon atoms and at least 0.5 vinyl groups/1000 carbon atoms, where the fraction of polyethylene with molecular weight less than 10000 g/mol has degree of branching from 0 to 1.5 branches on the side chains, longer than CH₃/1000 carbon atoms. The catalyst composition for synthesis of polyethylene in paragraph 1 consists of at least two different polymerisation catalysts, from which A) is at least one polymerisation catalyst based on monocyclopentadienyl complex of a group IV-VI metal, in which the cyclopentadienyl system is substituted by an uncharged donor (A1) of formula Cp-Z_k-A-M^A (II), where variables assume the following values: Cp-Z_k-A is , M^A is a metal which is selected from a group consisting of titanium (III), vanadium, chromium, molybdenum and tungsten, and k equals 0 or 1, or with hafnocene (A2), and B) is at least one polymerisation catalyst based on a ferrous component with a tridentate ligand containing at least two ortho-, ortho-disubstituted aryl radicals (B).

EFFECT: obtaining polyethylene with good mechanical properties, possibility for processing and high content of vinyl groups.

27 cl, 12 ex, 2 tbl, 5 dwg