Polymerization catalysts
AssigneeMontedison S.p.A.
InventorsAdolfo Mayr, Umberto Giannini, Ermanno Susa, Paolo Longi, Ettore Giachetti, Domenico DeLuca
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Abstract
Highly active catalysts for the polymerization of olefins are disclosed. The catalysts are prepared by mixing a hydride or organometallic compound of a metal belonging to Groups I, II or III of the Mendelyeev Periodic Table with the product obtained by contacting an oxygenated Ti compound in which one or more Ti atoms are bound through oxygen atoms to organic radicals with an activated anhydrous Mg dihalide. The polymerization of ethylene by means of said catalysts is also disclosed.
Claims12
Highly active catalysts for the polymerization of olefins and obtained by mixing
- (a) a catalyst-forming component which is a hydride or organo-metallic compound of a metal belonging to one of Groups I to III inclusive of the Mendelyeev Periodic Table
- with
- (b) a supported catalyst-forming component obtained by contacting a titanium compound containing organic radicals bound to oxygen through a carbon atom and in which at least one Ti atom is bound through the oxygen atom to the organic radical, any valency of the Ti atom not satisified by organic radicals bound to oxygen through the carbon atom being satisfied by halogen, with a carrier comprising an anhydrous magnesium dihalide in an active form characterized in that its X-ray powder spectrum does not show the most intense diffraction line as it appears in the X-ray powder spectrum of the normal, non-active magnesium dihalide, the spectrum of the active magnesium dihalide showing a broadening of said most intense diffraction line.
The method of preparing catalysts which are highly active in the polymerization of olefins which consists of mixing
- (a) a catalyst-forming component which is a hydride or organo-metallic compound of a metal belonging to one of Groups I to III inclusive of the Mendelyeev Periodic Table
- with
- (b) a supported catalyst-forming component obtained by contacting a titanium compound containing organic radicals bound to oxygen through a carbon atom and in which at least one Ti atom is bound through the oxygen atom to the organic radical, any valency of the Ti atom not satisfied by organic radicals bound to oxygen through the carbon atom being satisfied by halogen, with a carrier comprising an anhydrous magnesium dihalide in an active condition characterized in that its X-ray powder spectrum does not show the most intense diffraction lines as it appears in the X-ray powder spectrum of the normal, non-active magnesium dihalide, the spectrum of the active magnesium dihalide showing a broadening of said most intense diffraction line.
Dependencies are inferred from the claim text.