INCREASE OF HOMOGENEITY OF POLYETHYLENE MIXTURES Russian patent published in 2015 - IPC C08L23/04 C08L23/08 C08J5/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of increasing homogeneity of mixtures of polyethylene, intended for manufacturing moulded products, films, tubes, wires and cables. A mixture of polyethylenes contains three fractures (A), (B) and (C) of a homo- or a copolymer of ethylene and at least one comonomer C₃-C₁₀ with different molecular weights. The low-molecular fraction A) has the weight-average molecular weight M_w lower than 40 kg/mol, the highly-molecular fraction B) has the molecular weight M_w higher than 250 kg/mol and the fraction C) has the intermediate molecular weight with the weight-average molecular weight M_w from 100 to 200 kg/mol. The mixture of polyethylenes has a single peak of melting as determined by means of differential scanning calorimetry (DSC).

EFFECT: obtained mixtures of polyethylenes, due to the improved homogeneity, possess improved properties, in particular surface properties, good processability and good mechanical properties.

16 cl, 9 dwg, 4 tbl, 3 ex