OBTAINING LINEAR LOW DENSITY POLYETHYLENE (LLDPE), WHICH HAS CONTROLLED CONTENT OF XYLENE-SOLUBLE OR HEXANE-EXTRACTABLE SUBSTANCES Russian patent published in 2016 - IPC C08F210/16 C08F4/649 C08F4/654 C08J5/18 

FIELD: chemistry.

SUBSTANCE: invention relates to linear low density polyethylene. Described is method for obtaining brands of linear low density polyethylene (LLDPE), which have different content of xylene-soluble of hexane-extractable substances. Method includes copolymerisation of ethylene with C_3-10-α-olefin in presence of Ziegler-Natta catalyst, alkylaluminium and electron donor. Dependence of xylene-soluble or hexane-extractable substances on alkylaluminium/electron donor ratio is determined. Dependence of normed content of xylem-soluble substances Y₁ (wt %) in LLDPE on alkylaluminium/electron donor ratio is determined by equation Y₁=6.16X^0.33. Dependence of content of hexane-extractable substances Y₂ (wt %) in LLDPE on alkylaluminium/electron donor ratio X (molar ratio) is determined by equation Y₂=0.14X^1.14. Also described are: method for control of LLDPE film gluing, linear LLDPE and film.

EFFECT: achievement of desirable content of xylene-soluble or hexane-extractable substances by application of the same catalyst with alteration of electron donor concentration.

23 cl, 6 dwg, 1 tbl, 12 ex