POLYETHYLENE FILM HAVING IMPROVED MECHANICAL PROPERTIES AND IMPERMEABILITY, AND METHOD OF MAKING SAID FILM Russian patent published in 2012 - IPC C08J5/18 C08L23/04 C08L23/08 

FIELD: chemistry.

SUBSTANCE: invention relates to a polyethylene film for making packaging, grocery sacks, trash can liners and produce bags. The film is made from a multimodal polymer composition obtained using a double metallocene catalyst and contains an ethylene homopolymer or a copolymer of ethylene and alpha-olefin comonomer or combination thereof and, optionally, additives and modifiers. The film is characterised by total energy dart drop, measured in accordance with ASTM D4272, greater than about 0.45 ft.lbf, dart drop impact strength, measured in accordance with ASTM D1709 Method A, greater than about 135 g, and moisture vapour transmission rate, measured in accordance with ASTM F1249 at 100°F and 90% relative humidity, less than about 0.85 g-mil/100 square inch/24 hour. Said tests are performed on a test specimen having a 0.8 mil thickness.

EFFECT: improved film properties.

20 cl, 2 dwg, 4 tbl, 4 ex