Process for producing polyethylenes having a broad molecular weight distribution, and a catalyst system used thereby

Molecular weight distribution of a wide choice of ethylene and Alpha-olefins ethylene homopolymers or copolymers of preparation methods, including 100-80% (weight) of ethylene and 0-20% (weight) of comonomer in the presence of two separate and catalyst for polymerization in the presence of a and b. Catalyst on a deposition in an inorganic carrier contains mainly chromium oxidation state of 2. Double b, containing an inorganic carrier for catalyst reaction of cyclopentadienyl base chromium compounds. Generation polyethylene compounds including 40-80% (weight) of the first polyethylene and 60-20% (weight) polyethylene II. The first polyethylene is characterized by its melt index index of molecular weight distribution of MI21<5 and Mw/Mn>15. The second polyethylene is characterized by MI2>300 and corresponding to the first number of collateral on polyethylene, which contains high number of alkyl branching to 20%.