Catalyst system for the polymerization of alkenes to polyolefins

Miller, Stephen A; Bercaw, John E

Title: Catalyst system for the polymerization of alkenes to polyolefins

Patent · Tue Jan 01 00:00:00 EST 2002

OSTI ID:874827

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

Cambridge, MA
Pasadena, CA

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%.

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

DOE Contract Number:: FG03-85ER13431

Assignee:: California Institute of Technology (Pasadena, CA)

Patent Number(s):: US 6469188

OSTI ID:: 874827

Country of Publication:: United States

Language:: English

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Related Subjects

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/

Title: Catalyst system for the polymerization of alkenes to polyolefins

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References (33)

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