Patent ID: 6335411
Filing Date: 2002-01-01
Classification: C08F

Abstract:
Process for the polymerization of ethylene, optionally with one or more co-monomers, in two reactors in series, in the presence of a catalytic solid to produce an ethylene polymer having a die swell ratio (Rb) of at least 1.4, a resistance to cracking under stress (ESCR) of at least 55 h and a melt index (MI5) of at least 0.2, wherein the catalytic solid comprises titanium and zirconium in a Zr/Ti molar ratio of at least 2 and a co-catalyst, the first reactor being fed with ethylene and optionally with co-monomer and/or with hydrogen, with the catalytic solid and with the co-catalyst, the reaction medium of the first reactor being transferred into the second reactor, and the second reactor also being fed with ethylene and optionally with co-monomer and/or with hydrogen.