Polyethylene molding composition for coating steel pipes

Details Polyethylene molding composition for coating steel pipes Polyethylene molding composition for coating steel pipes

C - Chemistry, Metallurgy

08

F

C08F 297/08 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2579944

The invention relates to a polyethylene molding composition which has a multimodal molar mass distribution and is particularly suitable for producing protective coatings on steel pipes. The molding composition has a density at a temperature of 23~C in the range from 0.94 to 0.95 g/cm3 and An MFI190/5 in the range from 1.2 to 2.1 dg/min. It comprises from 45 to 55% by weight of a low molecular weight ethylene homopolymer A, from 30 to 40% by weight of a high molecular weight copolymer B of ethylene and another olefin having from 4 to 8 carbon atoms and from 10 to 20% by weight of an ultra high molecular weight ethylene copolymer C.

L~invention concerne une composition de polyéthylène pour moulage dont les poids moléculaires sont répartis de manière multimodale et qui est particulièrement adaptée à la production de revêtements de protection sur tubes en acier. La composition pour moulage a une masse volumique à 23 °C allant de 0,94 à 0,95 g/cm3 et un indice de fluidité à chaud MFI190/5 allant de 1,2 à 2,1 dg/min. Elle comprend de 45 à 55 % en poids d~un homopolymère A de l~éthylène de faible poids moléculaire, de 30 à 40 % en poids d~un copolymère B de l~éthylène de poids moléculaire élevé et d~une autre oléfine ayant de 4 à 8 atomes de carbone, et de 10 à 20 % en poids d~un copolymère C de l~éthylène de poids moléculaire très élevé.

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