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READILY DISPERSIBLE ZIEGLER-NATTA PROCATALYST

IP.com Disclosure Number: IPCOM000125338D
Publication Date: 2005-May-27
Document File: 1 page(s) / 35K

Publishing Venue

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Abstract

A hydrocarbon oil dispersion of a solid procatalyst composition for use in a Ziegler-Natta olefin polymerization is prepared by contacting a solid precursor composition comprising magnesium, titanium, and alkoxide moieties with a halogenating agent and an internal electron donor in any order, in a suitable reaction medium to prepare a solid procatalyst composition by halogen exchange; separating the solid procatalyst composition from the reaction medium; and optionally performing one or more of the following steps: further halogenating the solid procatalyst composition; exchanging the procatalyst composition under metathesis conditions; substituting metal values in the procatalyst composition; extracting the procatalyst composition; rinsing the procatalyst composition; partially drying the procatalyst composition; and/or dispersing the procatalyst composition in a hydrocarbon oil.

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READILY DISPERSIBLE ZIEGLER-NATTA PROCATALYST

A hydrocarbon oil dispersion of a solid procatalyst composition for use in a Ziegler-Natta olefin polymerization is prepared by contacting a solid precursor composition comprising magnesium, titanium, and alkoxide moieties with a halogenating agent and an internal electron donor in any order, in a suitable reaction medium to prepare a solid procatalyst composition by halogen exchange; separating the solid procatalyst composition from the reaction medium; and optionally performing one or more of the following steps: further halogenating the solid procatalyst composition; exchanging the procatalyst composition under metathesis conditions; substituting metal values in the procatalyst composition; extracting the procatalyst composition; rinsing the procatalyst composition; partially drying the procatalyst composition; and/or dispersing the procatalyst composition in a hydrocarbon oil. 

In the foregoing procedure, some or all separations of solid product are performed using a filter medium having a permeability of from 30 to 60 CFM (0.8-1.7 M3/m), preferably 40-50 CFM (1.1-1.4 M3/m).  The resulting solid compositions are more readily dispersed in hydrocarbon oils than are procatalysts recovered using filter cloths having decreased permeability and the resulting dispersions contain fewer undesirable large particles. 

As an example, Mg3Ti(OC2H5)8Cl2 precursor and diisobutylphthalate (0.3 liter/kilogram precursor) are combined in a 50/50 (vol/vol) mixture of TiCl4/m...