Abstract: A polyethylene resin comprising from 35 to 49 wt. % of a first polyethylene fraction of high molecular weight and from 51 to 65 wt. % of a second polyethylene fraction of low molecular weight, the first polyethylene having a density of up to 0.930 g/cm3, and an HLMI of less than 0.6 g/10 min and the second polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3 and an MI2 of greater than 10 g/10 min, and the polyethylene resin, having a density of great 0.946 g/cm3, an HLMI of from 1 to 100 g/10 min, a dynamical viscosity, measured at 0.01 radians/second, greater than 200,000 Pa.s and a ratio of the dynamical viscosities measured at, respectively 0.01 and 1 radians/second greater than 8.

Abstract: Multi-layered pipe comprising a main layer of polyethylene compound having a resistance to stress cracking NPT measured according to ISO 13479 standard of less than 8000 hours and an internal layer of polyethylene compound having a resistance to stress cracking NPT of higher than 8000 hours, the thickness of the internal layer being between 1 and 25% of the total pipe thickness but not less than 0.3 mm.

Abstract: The invention concerns a polyethylene based composition comprising 0.05 to 0.5 wt. % of at least a saturated fatty acid amide containing 8 to 30 carbon atoms, 0 to 0.1 wt. % of an auxiliary lubricant selected among fatty acids, fatty acid esters, fatty acid salts, monounsaturated fatty acid amides, polyols containing at least 4 carbon atoms, monoalcohol or polyalcohol monoethers, glycerol esters, paraffins, polysiloxanes, fluorinated polymers and mixtures thereof, and 0 to 5 wt. % of one or more additives selected among the antioxidants, anti-acids, anti-UV stabilizers, coloring agents and antistatic agents.

Abstract: The invention concerns a method for producing ethylene homopolymers or copolymers comprising at least 90 mol % of units derived from ethylene which consists in: contacting in polymerising conditions, the monomers with a catalytic system including: (a) a catalytic solid comprising a metallocene of a transition metal of groups 4 to 6 of the periodic table containing at least a cyclopentadiene ligand capable of being substituted and a support, (b) at least an organoaluminium compound selected among compounds of general formula (1): AlTx(Y′)yX′z wherein: T is a hydrocarbon group containing 1 to 30 carbon atoms; Y′ is a group selected among —OR′, —SR′ and NR′R″ with R′ and R″ independently representing a hydrocarbon group containing 1 to 30 carbons atoms; X′ is a halogen atom: x verifies the relationship 0<x≦3; y verifies the relationship 0≦y<3; z verifies the relationship 0≦2<3, and x+y+z=3, and (c) at least