Constance Nanson Patrick

US Patent:

7220806, May 22, 2007

Filed:

Apr 29, 2005

Appl. No.:

11/119243

Inventors:

William John Gauthier - Houston TX, US
Jun Tian - LaPorte TX, US
David John Rauscher - Angleton TX, US
Constance Hayworth Patrick - Conroe TX, US
Shady Nader Henry - Seabrook TX, US
Nathan Williams - Webster TX, US

Assignee:

Fina Technology, Inc. - Houston TX

International Classification:

C08F 4/76
C08F 4/52

US Classification:

526170, 525160, 525943, 525348

Abstract:

A process for preparing low melting copolymers comprising contacting a mixture of olefin monomers with a CpFlu-type metallocene catalyst under reaction conditions sufficient to form a copolymer. The copolymers thus prepared desirably display melt temperatures from about 100 C. to about 140 C. and may be produced with reduced amounts of ethylene. The copolymers may also exhibit reduced levels of undesirable xylene solubles, relatively narrow molecular weight distribution, and other improved optical and physical properties.

US Patent:

20040204310, Oct 14, 2004

Filed:

Apr 11, 2003

Appl. No.:

10/412372

Inventors:

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

International Classification:

B01J031/00
C08F004/44

US Classification:

502/103000, 526/129000, 526/943000, 526/160000, 526/351000, 526/352000, 502/152000, 556/011000, 556/027000, 556/043000, 556/053000, 556/058000

Abstract:

Supported metallocene catalysts and processes for the use of such catalysts in isotactic polymerization of a Cethylenically 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 CCalkyl group.