PRODUCTION OF POLYETHYLENE ARTICLES WITH IMPROVED RIGIDITY, IMPACT STRENGTH AND PROCESSABILITY Russian patent published in 2019 - IPC C08F210/16 C08F210/02 C08F4/6592 C08F4/76 

FIELD: chemistry.

SUBSTANCE: invention relates to polyethylene copolymers. Copolymer contains ethylene and at least one alpha-olefin having 4–20 carbon atoms. Copolymer is obtained using an adjusted catalyst system comprising a supported catalyst containing bis(n-propylcyclopentadienyl)hafnium(R₁)(R₂) and correcting catalyst of meso-O(SiMe₂Ind)₂Zr(R₁)(R₂). Copolymer has no long-chain branches, as indicated by a negative deviation of the first derivative on the van Gurp-Palmer (vGP) curve at frequency of 0.1–300 rad / s at 190 °C. Copolymer has a melt index ratio of 15–80 and density of 0.89–0.93 g/cm³.

EFFECT: copolymer has improved physical properties with wide orthogonal composition distribution.

7 cl, 7 dwg, 9 tbl, 12 ex