| abstract |
FIELD: polymer materials.SUBSTANCE: invention relates to a polyolefin film with improved impact strength. Film obtained using a polyethylene copolymer obtained from ethylene and a comonomer selected from 1-butene or 1-hexene using a chromium oxide catalyst, reduced with the help of organo-aluminum compound, wherein molar ratio in gas phase of comonomer to ethylene ranges from 0.012 to 0.04, and a polyethylene copolymer having a density in the range from about 0.9350 to about 0.950 g/cm3and I21/I5ranging from about 18.0 to about 30.0, wherein the film has a thickness of about 5.0 to about 75.0 mcm and impact strength (g/mcm), improved by 17–56 percent compared to the film of the ethylene-based copolymer, obtained using a silyl-chromate catalyst instead of said reduced chromium oxide catalyst.EFFECT: invention enables to obtain a film having an optimum ratio of characteristics of breaking strength and impact strength.9 cl, 1 dwg, 5 tbl, 2 ex |