| abstract |
(57) [Summary] [Problem] To provide a method for producing a crosslinked polyethylene tube having both "flexibility at normal temperature" and more excellent "strength at high temperature". SOLUTION: The density obtained by polymerization using a metallocene compound as a polymerization catalyst is 0.932 to 0.940 g / cm 3 , the weight average molecular weight is 40,000 to 90,000, and the molecular weight distribution (chromatographic method: Mw / Mn). After the polyethylene resin having a value of 0 or more and less than 4.0 is supplied to the extruder, the polyethylene resin is grafted with a silane compound in the extruder in the presence of a radical generator to transform the silane into a silane, and in the presence of a silanol condensation catalyst. While promoting the silanolation with the above, it is extruded into a tube and crosslinked to a gel fraction of 65% or more. |