Polyethylene molding material and pipe produced therewith...

Details Polyethylene molding material and pipe produced therewith... Polyethylene molding material and pipe produced therewith...

C - Chemistry, Metallurgy

08

L

C08L 23/04 (2006.01) C08L 23/06 (2006.01) C09D 123/04 (2006.01) F16L 9/12 (2006.01)

Patent

CA 2377672

The invention relates to a polyethylene molding material having a bimodal molecular weight distribution which has an overall density of >= 0.948 g/cm3 and a melt flow index MFI190/5 of <= 0.2 dg/min. It comprises an amount of from 35 to 65% by weight of low-molecular-weight ethylene homopolymer A which has a viscosity number VN A in the range from 40 to 90 cm3/g, a melt flow index MFI190/2.16 A in the range from 40 to 2000 dg/min and a density d A of >= 0.965 g/cm3, and an amount of from 35 to 65% by weight of high-molecular-weight ethylene copolymer B which has a viscosity number VN B in the range from 500 to 2000 cm3/g, a melt flow index MF190/5 B in the range from 0.02 to 0.2 dg/min and a density d B in the range from 0.922 to 0.944 g/cm3. The fraction of the molding material according to the invention obtained during a preparative TREF analysis at a temperature of 78°C ~ 3 K using p-xylene has an average molecular weight of >= 200,000 g/mol. The invention also relates to a high-strength pipe produced from the molding material according to the invention which has a stress cracking resistance of >= 1500 h, a fracture toughness of >= 9 mJ/mm2 and a flexural creep modulus, measured in accordance with DIN 54852-Z4, of >= 1350 N/mm2. It is particularly suitable for the transport of gases and water.

L'invention concerne une matière à mouler polyéthylène avec répartition bimodale de la masse molaire, présentant une densité totale > 0,948 g/cm<3> et un indice de fusion MFI190/5 < 0,2 dg/min. Cette matière contient d'une part entre 35 et 65 % en poids d'éthylène homopolymère A de faible poids moléculaire, possédant un indice de viscosité VZA situé entre 40 et 90 cm<3>/g, un indice de fusion MFI190/2,16A entre 40 et 2000 dg/min, et une densité dA > 0,965 g/cm<3>, et d'autre part, entre 35 et 65 % en poids d'éthylène homopolymère B de poids moléculaire important, possédant un indice de viscosité VZB situé entre 500 et 2000 cm<3>/g, un indice de fusion MFI190/5B entre 0,02 et 0,2 dg/min, et une densité dB entre 0,922 et 0,944 g/cm<3>. La fraction de matière à mouler selon l'invention, obtenue à une température de 78 DEG C +/- 3 K par analyse TREF préparatoire avec du p-Xylol, présente une masse molaire moyenne > 200 000 g/Mol. L'invention concerne également un tuyau très résistant réalisé dans la matière à mouler selon l'invention, présentant une résistance au fissurage par contrainte > 1500 h, une résistance à la rupture > 9 mJ/mm<2>, et un module de flexion, mesuré selon DIN 54852-Z4, > 1350 N/mm<2>. Ce tuyau est particulièrement adapté au transport de gaz et d'eau.

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