Process for coating a pipe with high throughput using...

Details Process for coating a pipe with high throughput using... Process for coating a pipe with high throughput using...

C - Chemistry, Metallurgy

09

D

C09D 123/06 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01)

Patent

CA 2706983

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/M3 to 955 kg/m3 . The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

La présente invention porte sur des tuyaux recouverts ayant une couche de polyéthylène multimodal. Le copolymère multimodal de l'éthylène est un copolymère de l'éthylène avec un ou plusieurs comonomères alpha-oléfines ayant de 4 à 10 atomes de carbone et une masse moléculaire moyenne en poids de 70 000 g/mol à 250 000 g/mol, le rapport de la masse moléculaire moyenne en poids à la masse moléculaire moyenne en nombre, Mw/Mn, de 15 à 50, un indice de fluage à chaud MFR2 de 0,05 g/10 min à 5 g/10 min, un indice de fluage à chaud MFR5 de 0,5 à 10 g/10 min et une masse volumique de 930 kg/m3 à 955 kg/m3. Les tuyaux peuvent être recouverts avec une capacité de production élevée et une bonne économie de production. Les revêtements ont de bonnes propriétés mécaniques.

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