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Living olefin polymerization processes

Patent ·
OSTI ID:1175990
;
Processes for the living polymerization of olefin monomers with terminal carbon-carbon double bonds are disclosed. The processes employ initiators that include a metal atom and a ligand having two group 15 atoms and a group 16 atom or three group 15 atoms. The ligand is bonded to the metal atom through two anionic or covalent bonds and a dative bond. The initiators are particularly stable under reaction conditions in the absence of olefin monomer. The processes provide polymers having low polydispersities, especially block copolymers having low polydispersities. It is an additional advantage of these processes that, during block copolymer synthesis, a relatively small amount of homopolymer is formed.
Research Organization:
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG02-86ER13564
Assignee:
Massachusetts Institute of Technology (Cambridge, MA)
Patent Number(s):
7,135,544
Application Number:
11/004,038
OSTI ID:
1175990
Country of Publication:
United States
Language:
English

References (12)

Synthesis, Structures, Bonding, and Ethylene Reactivity of Group 4 Metal Alkyl Complexes Incorporating 8-Quinolinolato Ligands journal July 1997
Conformationally Rigid Diamide Complexes:  Synthesis and Structure of Titanium(IV) Alkyl Derivatives journal January 1996
Ethylenebis(salicylideneiminato)zirconium Dichloride:  Crystal Structure and Use as a Heterogeneous Catalyst in the Polymerization of Ethylene journal January 1997
Living Polymerization of α-Olefins by Chelating Diamide Complexes of Titanium journal January 1996
Polymerization of propene with enantiomorphic site catalysts, 1. A statistical analysis journal October 1996
Influence of rotation between agostic structures on ethene interaction with a zirconocene polymerization site journal July 1996
Olefin copolymerization with metallocene catalysts. I. Comparison of catalysts journal October 1991
Cationic Alkylzirconium Complexes Based on a Tridentate Diamide Ligand:  New Alkene Polymerization Catalysts journal January 1996
Synthesis of Titanium and Zirconium Complexes That Contain the Tridentate Diamido Ligand, [(( t -Bu- d 6 )N- o -C 6 H 4 ) 2 O] 2 - ([NON] 2 - ) and the Living Polymerization of 1-Hexene by Activated [NON]ZrMe 2 journal April 1997
Synthesis, Structure, and Reactivity of Zirconium Alkyl Complexes Bearing Ancillary Pyridine Diamide Ligands journal November 1998
Block Copolymers: Past Successes and Future Challenges journal February 2003
Copolymerization of propene and higher α-olefins with the metallocene catalyst Et[Ind]2HfCl2/methylaluminoxane journal February 1996

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY