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Job Robert Charles, Nestlerode Steven Michael: Preparation of olefin polymerization catalyst component.. Shell Oil, November 23, 1988: EP0292134-A2 (22 worldwide citation)

Solid catalyst component for use in the polymerization of olefins and having improved activity and selectivity are prepared by: a) halogenating a magnesium compound containing at least one aryloxy, alkyl carbonate or alkyloxy group with a first halide of tetravalent titanium and a first electron don ...


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Job Robert Charles, Zilker Daniel Paul Jr, Chadwick John Clement: Catalyst precursor production.. Shell Oil, December 18, 1991: EP0461775-A2 (3 worldwide citation)

Normally sparingly soluble magnesium alkoxide is solubilized in alkanol by the additional presence of certain acidic materials. The resulting solution is used to prepare a mixture of substantially spherical particles, substantially free of fines, containing an adduct magnesium alkoxide. The particle ...


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Job Robert Charles, Nozaki Kenzie: Olefin polymerization catalyst components and polymerization process.. Shell Int Research, April 3, 1985: EP0135973-A2 (3 worldwide citation)

An olefin polymerization catalyst component is obtained by halogenating a magnesium compound of the formula MgR min R sec wherein R min is an alkoxideoraryloxidegroup and R sec is an alkoxide or aryl-oxide group or halogen, with a halide of tetravalent titanium in the presence of a halohydrocarbon, ...


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Job Robert Charles: Silicate-modified magnesium alkoxyide polymerization catalysts.. Shell Oil, March 28, 1990: EP0360453-A2 (3 worldwide citation)

A process is disclosed for improving the productivity of a supported polymerisation catalyst formed from a magnesium alkoxide which normally undergoes poor metathesis towards production of a magnesium halide support. The process comprises reacting the magnesium alkoxide with an alkoxysilane to form ...


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Job Robert Charles: Process for preparing olefin polymerization catalyst component.. Shell Oil, December 23, 1987: EP0250244-A2 (3 worldwide citation)

A solid titanium-containing catalyst component is prepared by reacting a magnesium compound of the formula [Mg4(OR)6(R'OH)10]X, wherein X is at least one counter ion and has a total charge of -2 and R and R', which may be the same or different, are alkyl groups of 1 to 4 carbon atoms, with a halogen ...


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Job Robert Charles: Olefin polymerization catalyst.. Shell Oil, April 22, 1992: EP0481749-A2 (2 worldwide citation)

High activity, stereoregular olefin polymerization catalysts are produced from an organoaluminum cocatalyst, a selectivity control agent and a procatalyst obtainable from a magnesium-containing, titanium-containing procatalyst precursor also containing at least one of alkoxide, optionally substitute ...


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Job Robert Charles: Olefin polymerisation catalysts.. Shell Oil, June 14, 1989: EP0320145-A2 (2 worldwide citation)

A process for polymerizing alpha olefins is disclosed wherein the polymerization catalyst used comprises, a solid catalyst component prepared by mixing at least one alkyl or aryl magnesium compound with an aldehyde or a ketone in the presence of a solvent, the aldehyde or ketone being a branched or ...


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Job Robert Charles: Olefin polymerization catalyst.. Shell Oil, August 26, 1992: EP0500308-A2 (1 worldwide citation)

A high activity olefin polymerization catalyst, useful in the polymerization of low alpha -olefins, is obtainable by contacting an alkylaluminum halide with a solid reaction product of a magnesium alkoxide, a titanium tetraalkoxide and a phenolic compound which is phenol or an activated phenol and m ...


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Job Robert Charles, Sterna Larry Lee: Ethylene-propylene copolymer compositions. Shell Oil, September 4, 1996: EP0729985-A2 (1 worldwide citation)

Polypropylene impact copolymers and ethylene-propylene rubbery copolymers are produced by employing a high-activity, stereoregular polymerization catalyst comprising a titanium halide-containing procatalyst, an organoaluminum compound cocatalyst and a selectivity control agent. During at least the p ...