Polyethylene pipe resins and production thereof

US6946521B2 · kind B2 · utility

Assignees

• ATOFINA Research S.A. · BE
• Solvay Polyolefins Europe-Belgium S.A. · BE

Inventors

• Olivier Miserque · Court-Saint-Etienne, BE
• Jacques Michel · Limeil-Brévannes, FR
• Marc Dupire · Hyon, BE
• Fabian Siberdt · Brussels, BE
• Jean-Louis Costa · Grimbergen, BE
• Serge Bettonville · Ougrée, BE
• Virgil Rouyer · Brussels, BE
• Eric Damme · Arquennes, BE

Key dates

• Filing date: Oct 25, 2001
• Grant date: Sep 20, 2005
• Expiry date: Oct 25, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2314/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

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.