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:

Miller, Stephen A ^[1]; Bercaw, John E ^[2]

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+ Show Inventor Affiliations

1. Cambridge, MA
2. Pasadena, CA

Issue Date:

Tue Jan 01 00:00:00 EST 2002

Research Org.:

California Institute of Technology (CalTech), Pasadena, CA (United States)

OSTI Identifier:

874827

Patent Number(s):

6469188

Assignee:

California Institute of Technology (Pasadena, CA)

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

C - CHEMISTRY C07 - ORGANIC CHEMISTRY C07F - ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J2531/30 - Complexes comprising metals of Group III
B01J2531/40 - Complexes comprising metals of Group IV
B01J2531/48 - Zirconium
B01J2531/49 - Hafnium
B01J2531/50 - Complexes comprising metals of Group V
B01J31/2295 - {Cyclic compounds, e.g. cyclopentadienyls}

C - CHEMISTRY C07 - ORGANIC CHEMISTRY C07F - ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM

C07F17/00 - Metallocenes

C - CHEMISTRY C08 - ORGANIC MACROMOLECULAR COMPOUNDS C08F - MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

C08F110/06 - Propene
C08F2500/03 - Narrow molecular weight distribution
C08F2500/12 - Melt flow index or melt flow ratio
C08F2500/15 - Isotactic
C08F2500/20 - Activation energy or enthalpy
C08F2500/21 - Rubbery or elastomeric properties
C08F4/65912 - {in combination with an organoaluminium compound}
C08F4/65927 - {two cyclopentadienyl rings being mutually bridged}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

Y10S526/943 - Polymerization with metallocene catalysts

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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/