POLYETHYLENE COMPOSITION FOR MOULDING WITH INFLATION FOR SMALL CONTAINER MANUFACTURING Russian patent published in 2009 - IPC C08L23/06 C08L23/08 C08F297/08 B29C49/04 

FIELD: package.

SUBSTANCE: invention concerns polyethylene composition with multimode molecular weight distribution for inflation moulding of small containers with volume within 200 to 5000 cm³. Composition density is within 0.955 to 0.960 g/cm³ at 23°C and melt flow rate MFR_190/5 is within 0.8 to 1.6 dg/min. Composition includes 45 to 55% wt % of ethelene A homopolymer with low molecular weight, 20 to 35 wt % of B copolymer with high molecular weight and 20 to 30 wt % of ethylene C copolymer with superhigh molecular weight. Swelling grade of composition is within 115 to 145%, and small items moulded out of it by inflation feature extremely high mechanical durability, as the claimed moulding composition has shock resistance by Izod test (by ISO) within 8 to 14 kJ/m². Full notch creep test (FNCT) showed results within 8 to 20 hours.

EFFECT: composition with good processing properties for moulding with inflation in manufacturing of small items moulded with inflation.

9 cl, 2 tbl, 2 ex