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:
Nov. 12, 2002
Filed:
Dec. 29, 2000
Robert M. Waymouth, Palo Alto, CA (US);
Raisa L. Kravchenko, Wilmington, DE (US);
Jennifer Maciejewski Petoff, Belle Mead, NJ (US);
Joyce Hung, Stanford, CA (US);
The Board of Trustees of the Leland Standard Junior University, Stanford, CA (US);
Abstract
Metallocene catalysts having plural coordination geometries for synthesis of high melting polyolefin copolymers suitable as thermoplastic elastomers. The inventive catalysts comprise unbridged, substituted or unsubstituted cyclopentadienyl metallocene catalysts that are capable of inter-converting between states with different polymerization or copolymerization characteristics, which interconversion is controlled by selecting the substituents of the cyclopentadienyl ligands so that the rate of interconversion of the two states is within several orders of magnitude of the rate of formation of a single polymer chain. Where r >r the polymer can be characterized as multiblock; where r <r , the result is a polymer blend and where r /r is close to 1, the resulting polymer is a mixture of blend and multiblock. The inventive metallocene catalysts are able to interconvert between more than two states, with embodiments of four states being shown in FIG.