POLYETHYLENE COMPOSITION FOR MANUFACTURING BARRELS WITH TWO DISCHARGE HOLES Russian patent published in 2009 - IPC C08L23/04 C08L23/16 C08F297/08 B29C49/04 

FIELD: chemistry.

SUBSTANCE: polyethylene composition is intended for formation with blowing of barrels with 2 discharge holes with volume ranging from 50 to 250 dm³(l). Composition has density within the range from 0.950 to 0.956 g/cm³ at 23°C, value of index of melt flow rate MFR_190/21.6 within the range from 1.5 to 3.5 dg/min and multimodal molecular-weight distribution. It includes from 35 to 45 wt % of homopolymer of ethylene A with low molecular weight, from 34 to 44 wt % of copolymer B with high molecular weight, representing copolymer of ethylene and 1-olefin, containing from 4 to 8 carbon atoms, and from 18 to 26 wt % of copolymer of ethylene C with superhigh molecular weight. Copolymer B contains less than 0.1 wt % of comonomer calculating on copolymer B weight, and copolymer C contains comonomers in amount from 0.1 to 0.6 wt % calculating on copolymer C weight.

EFFECT: polyethylene composition possesses increased impact viscosity and has high degree of blowing 180-220%.

9 cl, 1 ex, 1 tbl