Solvay Polyolefins Europe-belgium

Jacques Breulet

Michel Promel

Olivier Lhost

Jiang Bian

Beno&icirc;t Koch

Ethylene polymer having a die swell ratio (R,) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI,) of at least 0.2 g/10 min. Processes for obtaining this ethylene polymer using different catalytic systems, the first based on titanium and zirconium used in a polymerization in two reactors; the second consisting of a mixture of a titanium catalyst and a titanium and zirconium catalyst, used in a polymerization in two reactors; the third based on chromium on a support comprising at least two constituents chosen from silica, alumina and aluminum phosphates, used in a polymerization in a single or in two reactors.

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Wezembeek-Oppem, Belgium

Jacques Breulet