Catalyst system for the polymerization of alkenes to polyolefins
Patent
·
OSTI ID:1174733
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%.
- Research Organization:
- California Institute of Technology, Pasadena, CA (United States)
- Sponsoring Organization:
- USDOE
- Assignee:
- California Institute of Technology (Pasadena, CA)
- Patent Number(s):
- 6,693,153
- Application Number:
- 10/267,988
- OSTI ID:
- 1174733
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalyst system for the polymerization of alkenes to polyolefins
Rheo-Optics and X-Ray Scattering Study of Elastomeric Polypropylene
Chiral C{sub 1}-symmetric group 4 metallocenes as catalysts for stereoregular {alpha}-olefin polymerization. Metal, ancillary ligand, and counteranion effects
Patent
·
Mon Dec 31 23:00:00 EST 2001
·
OSTI ID:874827
Rheo-Optics and X-Ray Scattering Study of Elastomeric Polypropylene
Technical Report
·
Tue Oct 16 00:00:00 EDT 2001
·
OSTI ID:798896
Chiral C{sub 1}-symmetric group 4 metallocenes as catalysts for stereoregular {alpha}-olefin polymerization. Metal, ancillary ligand, and counteranion effects
Journal Article
·
Tue Dec 12 23:00:00 EST 1995
· Journal of the American Chemical Society
·
OSTI ID:171385