1
Gregory G Hlatky, Howard W Turner: Catalyst system of enhanced productivity. Exxon Chemical Patents, B C Cadenhead, M B Kurtzman, M S Spiering, October 6, 1992: US05153157 (383 worldwide citation)

This invention relates to catalyst systems, and a method for using such system, for the enhanced production of homo and copolymer products of olefin, diolefin and/or acetylenically unsaturated monomers. This invention catalyst system comprises a Group III-A element compound for improving the product ...


2
Howard W Turner, Gregory G Hlatky, Henry W H Yang, Avinash C Gadkari, Gary F Licciardi: Block copolymers from ionic catalysts. Exxon Chemical Patents, C L Bell, M B Kurtzman, M S Spiering, February 21, 1995: US05391629 (170 worldwide citation)

A process for the production of block copolymers of ethylene and an .alpha.-olefin such as propylene by using an ionic catalyst system including a metallocene component and a component having a cation capable of donating a proton and a compatible non-coordinating anion. Novel block copolymers are pr ...


3
Howard W Turner, Jo Ann M Canich, Bernard J Folie: High temperature polymerization process using ionic catalysts to produce polyolefins. Exxon Chemical Patents, M S Spiering, W G Muller, April 18, 1995: US05408017 (113 worldwide citation)

This invention relates to a process for polymerizing olefins at high pressures in a polymerization medium at high temperature utilizing an ionic olefin polymerization catalyst derived from the reaction of a cyclopentadienyl-containing transition metal compound having a hydrolyzable alkyl or hydride ...


4
Donna J Crowther, Richard A Fisher, Jo Ann M Canich, Gregory G Hlatky, Howard W Turner: Transition metal olefin polymerization catalysts. Exxon Chemical Patents, F E Reid, M S Spiering, April 2, 1996: US05504049 (75 worldwide citation)

This invention relates to non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Compositions useful as ...


5
Donna J Crowther, Richard A Fisher, Jo Ann M Canich, Gregory G Hlatky, Howard W Turner: Transition metal olefin polymerization processes. Exxon Chemical Patents, M S Spiering, F E Reid, March 26, 1996: US05502124 (31 worldwide citation)

This invention relates to processes using non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Composi ...


6
Masahide Murata, Terry J Burkhardt: Amido silyldiyl bridged catalyst components, methods of making and using. Exxon Chemical Patents, M S Spiering, C P Schmidt, July 30, 1996: US05541350 (25 worldwide citation)

Disclosed is a mono- or di-amido silyldiyl bridged composition of matter useful as a catalyst component for the homo or copolymerization of olefins.


7
Howard C Welborn Jr: Silicon-bridged transition metal compounds. Exxon Chemical Patents, E K Batts, M S Spiering, May 24, 1994: US05314973 (25 worldwide citation)

Silicon-bridged transition metal compounds and their use as .alpha.-olefin polymerization catalysts are disclosed. A chiral silicon-bridged metallocene catalyst polymerizes .alpha.-olefins to high isotacity with a minimum of inversions at high rates of catalyst activity. The catalyst is easily made ...


8
Terry J Burkhardt, Masahide Murata, William B Brandley: Controlled particle size polyolefins from silica supported prepolymerized matallocene catalyst. Exxon Chemical Patents, M S Spiering, C P Schmidt, September 10, 1996: US05554704 (19 worldwide citation)

The invention relates to a novel process for producing a supported metallocene catalyst system useful for the polymerization and/or copolymerization of olefins, alpha-olefins, and/or diolefins which results in a catalyst product which during polymerization, produces minimal to no reactor fouling and ...


9
Andrew J Peacock: Thermoplastic olefins. Exxon Chemical Patents, M S Spiering, F E Reid, March 26, 1996: US05502112 (11 worldwide citation)

This invention relates to a ternary blend of 25 to 45 wt. % random polypropylene copolymer, 20 to 40 wt. % ethylene propylene rubber and 30 to 45 wt. % high density polyethylene having excellent low temperature impact resistance and useful for producing molded articles.


10
Palanisamy Arjunan: Process for converting polyketones to polyesters. Exxon Chemical Patents, M S Spiering, January 23, 1996: US05486326

A polyketone is contacted with an organic peroxyacid in a reactive, oxidization, slurry process to produce a polyester polymer.