Abstract: A cationic Group 3 or Lanthanide metal complex for coordination polymerization of olefins is disclosed. The precursor metal complex is stabilized by a monoanionic bidentate ancillary ligand and two monoanionic ligands. The ancillary ligand and the transition metal form a metallocycle having at least five primary atoms, counting any &pgr;-bound cyclopentadienyl group in the metallocycle as two primary atoms. Olefin polymerization is exemplified.
Type:
Grant
Filed:
November 29, 2001
Date of Patent:
January 13, 2004
Assignee:
ExxonMobil Chemical Patents Inc.
Inventors:
Joseph N Christopher, Kevin R. Squire, Jo Ann M. Canich, Timothy D. Shaffer
Abstract: Catalyst systems and methods for supporting catalysts and their components, particularly metallocene catalyst components, are provided. The method involves teqhniques for evenly distributing a small volume of catalyst component over and among a porous support material. Such even distribution is thought to result in reduced fouling.
Type:
Grant
Filed:
November 17, 1995
Date of Patent:
September 9, 1997
Assignees:
Exxon Chemical Patents, Inc., Hoechst
Inventors:
Jeffrey Lawrence Brinen, Anthony Nicholas Speca, Kelly Tormaschy, Kathryn Ann Russell
Abstract: 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 polymer of controlled morphology. The invention is particularly useful for but not limited to polymerizing propylene or copolymerizing propylene with olefins having two or more carbon atoms. The novel support technique described herein results in a catalyst which will obtain polymer product having controlled, uniform particle size, narrow molecular weight distribution, high bulk density and depending upon the metallocene employed and monomers polymerized, stereoregularity.
Type:
Grant
Filed:
July 1, 1994
Date of Patent:
September 10, 1996
Assignee:
Exxon Chemical Patents, Inc.
Inventors:
Terry J. Burkhardt, Masahide Murata, William B. Brandley
Abstract: Disclosed is a mono- or di-amido silyldiyl bridged composition of matter useful as a catalyst component for the homo or copolymerization of olefins.