Exxonmobil Chemical Patents Inc.

Other

James R Hart

Terry John Burkhardt

Robert Tan Li

Matthew Cornyn Kuchta

Udo M Stehling

William T Haygood, Jr

James Charles Vizzini

William Thomas Haygood

A turbine generator system, having: a rotatable base; and a plurality of rotor vanes extending from the rotatable base, wherein each of the rotor vanes have helical tapered inner and outer surfaces, and wherein each of the rotor vanes is curved to catch flow perpendicular to the axis of rotation of the rotatable base and to direct the flow into a vortical flow between the inner surfaces of the rotor vanes.

Helical taper induced vortical flow turbine

Olefin polymerization processes using catalyst systems based on metallocenes and olefin, in particular, propylene polymers obtainable thereby. The metallocenes may be represented by the formula: wherein Mpreferably is zirconium or hafnium; and Ris different from hydrogen.

Polymerization process and polymer composition

Wind turbine

Metallocenes and catalyst systems for olefin polymerization derived therefrom. The metallocenes may be represented by the formula: wherein Mpreferably is zirconium or hafnium; and Ris different from hydrogen.

Metallocenes and catalyst compositions derived therefrom

Metallocenes and catalyst systems for olefin polymerization derived therefrom. The metallocenes may be represented by the formula: 

This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization. The metallocene compositions may be represented by the formula:wherein Rare identical or different and are each a halogen atom, a C-Calkyl group which may be halogenated, a C-Caryl group which may be halogenated, a C-Calkenyl group, a C-C-arylalkyl group, a C-Calkylaryl group, a C-Carylalkenyl group, a &#x2014;NR', &#x2014;SR&#x2032;, &#x2014;OR&#x2032;, &#x2014;OSiR&#x2032;or &#x2014;PR&#x2032;radical, wherein R&#x2032; is one of a halogen atom, a C-Calkyl group, or a C-Caryl group, and Rand Rare identical or different and are a Group 14 radical having from 1 to 20 carbon atoms or are each primary, secondary or tertiary butyl groups, aryl groups, isopropyl groups, fluoroalkyl groups, trialkyl silyl groups, or other groups of similar size.

Metallocene compositions

Olefin polymerization processes using catalyst systems based on metallocenes and olefin, in particular, propylene polymers obtainable thereby. The metallocenes may be represented by the formula:&#x2003;wherein Mpreferably is zirconium or hafnium; and Ris different from hydrogen.

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Pasadena, TX, United States of America

James R Hart