Snamprogetti S.p.a.

Anic S.p.a.

Mirko Osellame

Margherita Corbellini

Alberto Greco

Agostino Balducci

This application relates to a process for the homopolymerization (or copolymerization) of unsaturated compounds, particularly ethylene and higher alpha olefines, to give homopolymers (or copolymers) having a wide molecular weight distribution. The polymerization yields are very high, even at relatively low pressures (10 bars), i.e. such as not to require scrubbing in order to remove the catalytic residue from the polymer. These results are obtained by using, in union with an organometallic aluminium compound, a catalyst in the form of a new titanium trihalide-based chemical composition satisfying the following formula:

Chemical composition based on titanium trihalide, a method for its

For the polymerization of ethylene, as such or with one or more alpha-olefines, a novel catalyst composition is suggested, which has a high yield of polymer per weight unit of catalyst. Such compositions are prepared from a titanium compound in which the valency of Ti is 3 or more, said compound being reacted with the vapors of one or more metals of the group consisting of Al, Cr, Mn, V, Ti, Zr, Mo, Zn and Ca in the presence of a halogen donor which is preferably an organic halide, certain inorganic halides being capable of being used provided that the halide metal has at least two degrees of valency. The composition is used in association with an aluminium hydrocarbyl halide. Yields as high as 30,000 grams of polymer per gram of elemental Ti can be obtained.

Polymerization of monoolefins using an aluminum-titanium catalyst system

For the polymerization of ethylene, as such or with one or more alpha-olefins, a novel catalyst composition is described, which gives a high yield of polymer per weight unit of catalyst. Such compositions are prepared from a titanium compound in which the valency of Ti is 3 or more, said compound being reacted with the vapors of one or more metals of the group consisting of Al, Cr, Mn, V, Ti, Zr, Mo, Zn and Ca in the presence of a halogen donor which is preferably an organic halide, certain inorganic halides being capable of being used provided that the halide metal has at least two degrees of valency. The composition is used in association with an aluminium hydrocarbyl halide. Yields as high as 30,000 grams of polymer per gram of elemental Ti can be obtained.

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Ombriano, Italy

Mirko Osellame