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Title: Catalyst system for the polymerization of alkenes to polyolefins

Abstract

The invention provides metallocene catalyst systems for the controlled polymerization of alkenes to a wide variety of polyolefins and olefin coplymers. Catalyst systems are provided that specifically produce isotactic, syndiotactic and steroblock polyolefins. The type of polymer produced can be controlled by varying the catalyst system, specifically by varying the ligand substituents. Such catalyst systems are particularly useful for the polymerization of polypropylene to give elastomeric polypropylenes. The invention also provides novel elastomeric polypropylene polymers characterized by dyad (m) tacticities of about 55% to about 65%, pentad (mmmm) tacticities of about 25% to about 35%, molecular weights (M.sub.w)in the range of about 50,000 to about 2,000,000, and have mmrm+rrmr peak is less than about 5%.

Inventors:
 [1];  [2]
  1. (Cambridge, MA)
  2. (Pasadena, CA)
Issue Date:
Research Org.:
California Institute of Technology (Pasadena, CA)
OSTI Identifier:
874827
Patent Number(s):
6469188
Assignee:
California Institute of Technology (Pasadena, CA) OAK
DOE Contract Number:  
FG03-85ER13431
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
catalyst; polymerization; alkenes; polyolefins; provides; metallocene; systems; controlled; wide; variety; olefin; coplymers; provided; specifically; produce; isotactic; syndiotactic; steroblock; type; polymer; produced; varying; ligand; substituents; useful; polypropylene; elastomeric; polypropylenes; novel; polymers; characterized; dyad; tacticities; 55; 65; pentad; mmmm; 25; 35; molecular; weights; msubwin; range; 50000; 2000000; mmrmrrmr; peak; molecular weight; wide variety; metallocene catalyst; /999/502/526/

Citation Formats

Miller, Stephen A., and Bercaw, John E. Catalyst system for the polymerization of alkenes to polyolefins. United States: N. p., 2002. Web.
Miller, Stephen A., & Bercaw, John E. Catalyst system for the polymerization of alkenes to polyolefins. United States.
Miller, Stephen A., and Bercaw, John E. Tue . "Catalyst system for the polymerization of alkenes to polyolefins". United States. https://www.osti.gov/servlets/purl/874827.
@article{osti_874827,
title = {Catalyst system for the polymerization of alkenes to polyolefins},
author = {Miller, Stephen A. and Bercaw, John E.},
abstractNote = {The invention provides metallocene catalyst systems for the controlled polymerization of alkenes to a wide variety of polyolefins and olefin coplymers. Catalyst systems are provided that specifically produce isotactic, syndiotactic and steroblock polyolefins. The type of polymer produced can be controlled by varying the catalyst system, specifically by varying the ligand substituents. Such catalyst systems are particularly useful for the polymerization of polypropylene to give elastomeric polypropylenes. The invention also provides novel elastomeric polypropylene polymers characterized by dyad (m) tacticities of about 55% to about 65%, pentad (mmmm) tacticities of about 25% to about 35%, molecular weights (M.sub.w)in the range of about 50,000 to about 2,000,000, and have mmrm+rrmr peak is less than about 5%.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Patent:

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