Pipe of polyethylene having improved mechanical properties

Details Pipe of polyethylene having improved mechanical properties Pipe of polyethylene having improved mechanical properties

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 9/127 (2006.01) F16L 9/12 (2006.01) C08L 23/04 (2006.01)

Patent

CA 2175158

The invention relates to a high strength pipe of ethylene polymer having a bimodal molecular weight distribution. Such pipe has a stress cracking resistance of >= 1400 h, a fracture toughness of >= 7 mJ/mm2 and a modulus of creep in flexure, measured according to DIN 54852-Z4, of >= 1100 N/mm2. The pipe according to the invention is produced from an ethylene polymer in which the ratio of weight of the low molecular weight fraction to the weight of the higher molecular weight fraction is in the range from 0.5 to 2.0 and which has a melt flow index MFI5/190°c of <= 0.35 g/10 min. It is particularly suitable for the trans-portation of gases and water.

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