FIELD: chemistry.
SUBSTANCE: group of inventions relates to films containing an ethylene polymer composition. Ethylene polymer compositions contain a uniformly branched first ethylene polymer component and a uniformly branched second ethylene polymer component with higher density than the first ethylene polymer component. In this case, the first ethylene polymer component and the second ethylene polymer component independently contain an ethylene/α-olefin copolymer and/or an ethylene homopolymer, and the first ethylene polymer component has density of 0.89 to 0.922 g/cm3. The second ethylene polymer component is characterized by higher density. Its density varies from 0.932 to 0.97 g/cm3. In this case, the amount of the second ethylene polymer component is from 4 to 50 wt.% relative to the total weight of the first ethylene polymer component and the second ethylene polymer component. The ethylene polymer composition is characterized by density from 0.912 to 0.925 g/cm3, a melt index of less than 3.5 g/10 min and a CY-a parameter at 190°C from 0.25 to 0.65, an ATREF curve containing two peaks, the first peak at temperatures from 67 to 82°С and the second peak at temperatures from 92 to 105°С. The difference between the temperatures of the first peak and the second peak is from 17 to 32°C for an ethylene polymer composition, which is a product of one reactor. The film has MD Elmendorf tear strength of 100 to 450 g/mil. Also described is an industrial product containing an ethylene polymer composition.
EFFECT: excellent impact strength and optical properties of polymers obtained with the help of metallocene catalysts, improved tear resistance in the machine direction, which allows them to be used, in particular, in blown films.
18 cl, 10 tbl, 4 dwg
