COPOLYMERS AND FILMS BASED THEREON Russian patent published in 2014 - IPC C08F210/16 C08F4/642 C08J5/18 B29C49/00 C08L23/16 

FIELD: chemistry.

SUBSTANCE: invention relates to a copolymer of ethylene and alpha-olefin, containing from 7 to 12 carbon atoms. The ethylene copolymer has a density (D) from 0.900 to 0.940 g/cm, a melt index MI₂ (2.16 kg, 190°C) from 0.01 to 50 g/10 min, a modulus of the melt elasticity G' (G"=500 Pa) from 20 to 150 Pa and the tear strength in a longitudinal direction (MD), ≥220 g, the tear strength in a transverse direction (TD)≥470 g, the impact strength in test with a falling sharpened object (DDI) ≥1800 g, in a form of a blow 25 mcm-thick film, obtained from the copolymer. MD represents the longitudinal direction, and TD represents the transverse direction in the blow film manufacturing. The copolymer is obtained in a gas phase with the application of an applied metallocene catalytic system. Also described is the copolymer, satisfying the ratio DDI≥21500×{1-Exp[-750(D-0.908)²]}×{Exp[(0.919-D)/0.0045]}. The blow film, including the ethylene copolymer is described.

EFFECT: obtaining the blow film from the copolymer, which has an improved processability and improved balance of the film properties with respect to the impact strength in the test with the falling sharpened object and tear strength.

21 cl, 4 tbl, 2 ex