Fina Technology, Inc.

Constance Hayworth Patrick

David J Rauscher

Jun Tian

William John Gauthier

Shady Henry

Nathan Williams

Margaret Kerr

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&#xb0; C. to about 140&#xb0; 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.

Process for increasing ethylene incorporation into random copolymers

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&#x2032; 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&#x2032;, 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.

Supported metallocene catalysts

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Conroe, TX, United States of America

Constance Hayworth Patrick