Bp Chemicals Limited

Bp Chimie Societe Anonyme

Jean-Louis Vidal

Andre Martens

Frederic Morterol

Joseph Laurent

Process and apparatus for controlling the manufacture of polymers

Process for the preparation of copolymers of ethylene and an alpha-olefin having six carbon atoms comprising hexene-1 or 4-methyl-pentene-1 with a density comprised between 0.910 and 0.940, involving a copolymerization of ethylene and an alpha-olefin having six carbon atoms comprising hexene-1 or 4-methyl-pentene-1 in the gas phase by means of a fluidized bed, in the presence of a catalyst system comprising on the one hand a co-catalyst consisting of at least one organo-metallic compound of a metal of Groups, II and III of the Periodic Table of Elements and on the other hand a supported catalyst comprising a special support based essentially on magnesium chloride and optionally aluminum chloride, on which support there has been precipitated a derivative of a transition metal of Groups IV, V and VI of the Periodic Table of Elements.

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Martigues, France

Jean-Louis Vidal