The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 2005
Filed:
Jan. 31, 2002
Matthew C. Kuchta, Houston, TX (US);
Udo M. Stehling, Vantaa, FI;
Robert T. LI, Houston, TX (US);
William T. Haygood, Jr., Houston, TX (US);
Terry J. Burkhardt, Kingwood, TX (US);
Matthew C. Kuchta, Houston, TX (US);
Udo M. Stehling, Vantaa, FI;
Robert T. Li, Houston, TX (US);
William T. Haygood, Jr., Houston, TX (US);
Terry J. Burkhardt, Kingwood, TX (US);
ExxonMobil Chemical Patents Inc., Houston, TX (US);
Abstract
This invention relates to bridged indenyl metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization. The bridge may be represented by the formula:wherein: Rto Rare identical or different, and are one of a hydrogen atom, a C-Calkyl group, a C-Calkoxy group, a C-Caryl group, a C-Caryloxy group, a C-Calkenyl group, a C-Carylalkyl group, a C-Calkylaryl group, a C-Carylalkenyl group, or a halogen atom, or together are a conjugated diene which is optionally substituted with one or more hydrocarbyl, tri(hydrocarbyl)silyl groups or hydrocarbyl, tri(hydrocarbyl)silylhydrocarbyl groups, said diene having up to 30 atoms not counting hydrogen; or two or more adjacent radicals Rto R, including Rand R, together with the atoms connecting them form one or more rings; and Mis carbon, silicon, germanium or tin.