A peroxide crosslinked ethylene polymer pressure pipe and a...

F - Mech Eng,Light,Heat,Weapons – 16 – L

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F16L 9/12 (2006.01)

Patent

CA 2558103

A peroxide crosslinked ethylene polymer pressure pipe and a method for the preparation thereof are described. The pipe is characterised in that it comprises an ethylene polymer with a density of less than 950 kg /m3 obtained by polymerisation with a single-site catalyst and having a shear thinning index, SHI5/300 of less than 20 and a MWD of <10. The method is characterised in that it comprises polymerising ethylene, optionally together with at least one comonomer, with a single-site catalyst to provide the above defined ethylene polymer, forming the ethylene polymer into a pipe by extrusion and crosslinking it.

L'invention concerne un tube pression en polymère d'éthylène réticulé au peroxyde et un procédé de préparation de celui-ci. Le tube est caractérisé en ce qu'il comprend un polymère d'éthylène dont la densité est inférieure à 950 kg /m?3¿, obtenu par polymérisation avec un catalyseur à site unique et possédant un indexe de fluidification, SHI¿5/300 ?inférieur à 20 et un MWD de <10. Le procédé est caractérisé en ce qu'il consiste à polymériser de l'éthylène, éventuellement conjointement avec au moins un comonomère, avec un catalyseur à site unique, de manière à obtenir le polymère d'éthylène défini ci-dessus et à former le polymère d'éthylène en un tube par extrusion et réticulation de celui-ci.

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