Pipe of polyethylene having improved mechanical properties

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

1997-10-06

1999-06-01

Dye, Rena L.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 3692, 428 357, 138DIG7, 526352, C08L 2306, B29D 2200

Patent

active

059086793

ABSTRACT:
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 .gtoreq.1400 h, a fracture toughness of .gtoreq.7 mJ/mm.sup.2 and a modulus of creep in flexure, measured according to DIN 54852-Z4, of .gtoreq.1100 N/mm.sup.2. 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 MFI.sub.5/190.degree. C. of .ltoreq.0.35 g/10 min. It is particularly suitable for the transportation of gases and water.

REFERENCES:
patent: 4461873 (1984-07-01), Bailey et al.
patent: 5338589 (1994-08-01), Bohm et al.
patent: 5503914 (1996-04-01), Michie, Jr. et al.

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