Patent ID: 6063878
Filing Date: 2000-05-16
Classification: C08F

Abstract:
A process for the copolymerization of ethylene and of at least one alpha-olefinic comonomer containing from 3 to 10 carbon atoms in two reactors for loop polymerization in liquid phase which are connected in series, in the presence of a chromium catalyst, comprising:a) introducing ethylene and a chromium catalyst into the first reactor at a temperature of 95 to 110.degree. C. to produce an ethylene homopolymer of low molecular weight of melt index MI.sub.2 of at least 1 g/10 minutes;b) transferring the ethylene homopolymer and the chromium catalyst into the second reactor at a temperature of 80 to 90.degree. C.; andc) adding the alpha-olefinic comonomer to obtain an ethylene copolymer of high molecular weight.