Margaret Ellen Kerr

US Patent:

6855783, Feb 15, 2005

Filed:

Apr 11, 2003

Appl. No.:

10/412372

Inventors:

William J. Gauthier - Houston TX, US
Margaret Kerr - Worcester MA, US
Jun Tian - LaPorte TX, US
David J. Rauscher - Angleton TX, US
Constance Hayworth Patrick - Conroe TX, US
Shady Henry - Seabrook TX, US

Assignee:

Fina Technology, Inc. - Houston TX

International Classification:

C08F004/42

US Classification:

526160, 526351, 526352, 526943, 502103, 502152, 556 1, 556 11, 556 27, 556 43, 556 53, 556 58

Abstract:

Supported metallocene catalysts and processes for the use of such catalysts in isotactic polymerization of a C ethylenically unsaturated monomer. The supported catalysts comprise a particulate silica support, an alkyl alumoxane component, and a metallocene catalyst component. The support has an average particle size of 10-50 microns, a surface area of 200-800 m/g and a pore volume of 0. 9-2. 1 milliliters per gram (ml/g). Alumoxane is incorporated onto the support to provide a weight ratio of alumoxane to silica of at least 0. 8:1. The metallocene is present in an amount of at least 1 weight percent of the silica and the alumoxane and is of the formula B(CpRaRb)(Fl′)MQin which Fl′ is an unsubstituted fluorenyl group or a fluorenyl group symmetrically substituted at the 3 and 6 positions, B is a structural bridge between Cp and Fl′, Ra is a bulky substituent in a distal position, Rb is a less bulky substituent proximal to the bridge and non-vicinal to the distal substituent, M is a Group IVB transition metal or vanadium, and Q is a halogen or a C-Calkyl group.

US Patent:

20020137624, Sep 26, 2002

Filed:

Feb 13, 2001

Appl. No.:

09/782752

Inventors:

William Gauthier - Houston TX, US
Margarito Lopez - Pasadena TX, US
David Rauscher - Angleton TX, US
Don Campbell - Webster TX, US
Margaret Kerr - Worcester MA, US

International Classification:

B01J031/00
B01J021/08

US Classification:

502/117000, 502/102000, 502/103000, 502/150000, 502/240000, 502/242000

Abstract:

Process of preparing silica-supported catalysts. A support material comprising silica particles impregnated with an alumoxane co-catalyst with at least one-half of the co-catalyst disposed within the internal pore volume of the silica is contacted with a dispersion of a metallocene catalyst in an aromatic solvent. The dispersion and support are mixed at a temperature of about 10 C. or less to enable the metallocene to become reactively supported on and impregnated within the alumoxane-impregnated silica particles. The supported catalyst is recovered from the aromatic solvent and washed with an aromatic hydrocarbon and then a paraffinic hydrocarbon at a temperature of about 10 C. or less. The washed catalyst is dispersed in a viscous mineral oil.