Formosa Plastics Corporation, U.s.a.

Formosa Plastics Corporation

Demin Xu

Yiqun Fang

Lei Zhang

Chih-Jian Chen

Gapgoung Kong

Guangxue Xu

Ming-Yung Lee

Organosilicon compounds having a structure represented by the general formula and a method for using same are provided as electron donors in the Ziegler-Natta type catalyst system for the homo-polymerization or co-polymerization of alpha olefins. The organosilicon compounds may be used in the preparation of the solid catalyst component, thus serving as 'internal electron donors', or employed during or prior to polymerization as 'external electron donors,' and therefore they can be used to prepare phthalate-free polyolefins.

Organosilicon compounds as electron donors for olefin polymerization catalysts and methods of making and using same

What is disclosed is a method for preparing a catalyst system and a catalyst system for polymerizing or copolymerizing an &#x3b1;-olefin. Catalyst component (A) is obtained by a process of reacting a magnesium complex (A-1) containing acid salts of group IB-VIIIB elements formed by contacting a magnesium halide with an acid salt solution of group IB-VIIIB metals or spherical particles adducts, an internal electron donor (A-2) of diester or diether or composite compounds, and a titanium compound (A-3). The catalyst compound (A) is contacted with a silicon compound (B) and an organoaluminium compound (C) to complete the catalyst system providing a good balance of catalyst performance in terms of activity and stereo-specificity.

Catalyst component for high activity and high stereoselectivity in olefin polymerization

Disclosed are a catalyst component for olefin polymerization comprising titanium, magnesium, a halogen, internal donors, in combination with a silane and oxalic acid diamides of the following formula: An olefin polymerization catalyst system consisting of the solid catalyst component, an organoaluminum compound, and an optional external electron donor compound is also disclosed. Employment of both oxalic acid diamides and silane component in the presence of internal electron donors as an elements of solid Ziegler-Natta type catalyst composition enhances stereo-specificity while maintaining excellent catalyst activity and hydrogen response, in which the modified catalyst composition produces polypropylene with good productivity and higher stereo-specificity than catalyst composition without such modification.

Catalyst system for enhanced stereo-specificity of olefin polymerization and method for producing olefin polymer

Heterocyclic organic compounds are used as electron donors in conjunction with solid Ziegler-Natta type catalyst in processes in which polyolefins such as polypropylene are produced. The electron donors may be used in the preparation of solid catalyst system, thus serving as 'internal electron donors,' or they may be employed during or prior to polymerization with the co-catalyst as 'external electron donors.'

Heterocyclic organic compounds as electron donors for polyolefin catalysts

The present invention relates to a Ziegler-Natta catalyst component for olefin polymerization containing an amide element in combination with one or more internal electron donors. The catalyst components, according to the present invention, are able to produce polypropylene polymers with higher stereo-regularity. The present invention also provides a phthalate-free catalyst system capable of producing polypropylene with an isotacticity that is equal to or higher than catalyst systems containing phthalate derivatives.

Olefin polymerization catalyst components and process for the production of olefin polymers therewith

Heterocyclic organic compounds are used as electron donors in conjunction with solid Ziegler-Natta type catalyst in processes in which polyolefins such as polypropylene are produced. The electron donors may be used in the preparation of solid catalyst system, thus serving as 'internal electron donors', or they may be employed during or prior to polymerization with the co-catalyst as 'external electron donors'.

The present invention relates to a Ziegler-Natta catalyst component for olefin polymerization containing a urea element in combination with one or more internal electron donors. The catalyst components are able to produce polypropylene polymers with higher stereo-regularity. The present invention also provides phthalate-free catalyst system capable of producing polypropylene with an isotacticity that is equal to or higher than catalyst systems containing phthalate derivatives.

Non-phthalate compounds having a structure represented by the general formula and a method for using same are provided as electron donors in the Ziegler-Natta type catalyst system for the homopolymerization or copolymerization of alpha olefins. The non-phthalate compounds may be used in the preparation of the solid catalyst component, thus serving as 'internal electron donors', or employed during or prior to polymerization as 'external electron donors,' and therefore they can be used to prepare phthalate-free polyolefins.

Non-phthalate compounds as electron donors for polyolefin catalysts

A phthalate-free catalyst component for olefin polymerization comprising titanium, magnesium, a halogen, diether, and oxalic acid diamides represented by the following formula (I): and an olefin polymerization catalyst system consisting of the solid catalyst component, an organoaluminum compound, and an optional external electron donor compound. The present catalyst compositions improve diether-based catalyst selectivity while maintaining excellent catalyst activity and hydrogen response. An olefin polymer that has a moderate molecular weight distribution while maintaining higher stereoregularity (isotacticity) over diether-based catalyst, and better than or equal to phthalate-based catalyst can be produced by utilizing the inventive catalyst component.

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Port Lavaca, TX, United States of America

Demin Xu