POLYETHYLENE MOULDING COMPOSITION FOR MAKING FILMS THROUGH EXTRUSION BLOWING, HAVING IMPROVED MECHANICAL PROPERTIES Russian patent published in 2010 - IPC C08L23/04 C08J5/18 C08F297/08 B29C49/04 

FIELD: chemistry.

SUBSTANCE: film is made from a composition having multi-modal molecular-weight distribution and density between 0.940 and 0.948 g/cm³. The composition contains 40-60 wt % of a first fraction of an ethylene polymer made from a homopolymer A, 25-45 wt % of a second fraction of ethylene polymer made from a first copolymer B of ethylene and at least one first comonomer from a group of olefins having 4-8 carbon atoms and 10-30 wt % of a third fraction of ethylene polymer made from a second copolymer C of ethylene and at least one second comonomer from a group of olefins having 4-8 carbon atoms. The first copolymer B of ethylene has molecular weight which is less than that of the second copolymer C of ethylene, but greater than that of homopolymer A.

EFFECT: disclosed thin films have improved mechanical properties, particularly impact resistance when testing the films using a falling pointed load, with high rate of collection without deterioration of stability of the molten bubble.

12 cl, 2 tbl, 3 ex