Supported catalyst compositions having improved flow properties and preparation thereof
AssigneeUnivation Technologies, LLC
InventorsRichard B. Pannell, Chi-I Kuo, Shamah Lloyd
Life of this patent
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Abstract
Supported catalyst compositions, useful in olefin polymerization, and having improved flow properties are disclosed. The catalyst compositions may be characterized by low macro pore volume and high bulk density. Methods for preparing the catalyst compositions are also disclosed.
Claims18
A supported olefin polymerization catalyst composition comprising one or more particulate supports, one or more catalyst compounds, a continuity additive and one or more activator compounds, wherein the supported catalyst composition has a ratio of Al/Si on an external surface area of the support to Al/Si on an internal surface area of the support that is less than or equal to 3.0, and is formed by drying a suspension including the one or more particulate supports, the one or more catalyst compounds, the continuity additive, the one or more activator compounds, and a diluent and has a macro pore volume, as determined by ISO 15901-1, of less than or equal to 1.23 cm3/g, wherein the drying is performed at a temperature of less than or equal to 65° C. and at a pressure that is less than or equal to 8 psia.
A method for producing a supported olefin polymerization catalyst composition comprising the steps of:
- a) forming a suspension comprising one or more particulate supports, one or more catalyst compounds, a continuity additive, and one or more activator compounds in one or more liquid diluents;
- and
- b) drying the suspension to form the supported catalyst composition;
- wherein the supported catalyst composition has a ratio of Al/Si on an external surface area of the support to Al/Si on an internal surface area of the support that is less than or equal to 3.0, and a macro pore volume, as determined by ISO 15901-1, of less than or equal to 1.23 cm3/g and step b) is performed at a temperature of less than or equal to 65° C. and at a pressure which is greater than or equal to the vapor pressure of the one or more diluents, wherein the pressure is less than or equal to 8 psia.
Dependencies are inferred from the claim text.