Method for production of multimodal polyolefins of tunable...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C526S078000, C526S079000, C526S083000, C526S087000, C526S113000, C526S114000, C526S118000, C526S119000, C526S161000, C526S172000

Reexamination Certificate

active

07053157

ABSTRACT:
The present invention relates to a method of producing multimodal polyolefins using at least one or more activated metallocene catalysts. The activated metallocene catalysts are used in combination in a single-process method. The method allows for the production of multimodal polyolefins of tunable composition, molecular weight and polydispersity.

REFERENCES:
patent: 3542693 (1970-11-01), Price
patent: 4892914 (1990-01-01), Hefner
patent: 5055438 (1991-10-01), Canich
patent: 5057475 (1991-10-01), Canich et al.
patent: 5132380 (1992-07-01), Stevens et al.
patent: 5227440 (1993-07-01), Canich et al.
patent: 5260244 (1993-11-01), Pettijohn
patent: 5279999 (1994-01-01), DeBoer et al.
patent: 5317036 (1994-05-01), Brady, III et al.
patent: 5371146 (1994-12-01), Takahashi et al.
patent: 5387660 (1995-02-01), Doyle et al.
patent: 5416178 (1995-05-01), Winter et al.
patent: 5464906 (1995-11-01), Patton et al.
patent: 5527752 (1996-06-01), Reichle et al.
patent: 5648438 (1997-07-01), Henry et al.
patent: 5674795 (1997-10-01), Wasserman et al.
patent: 5681908 (1997-10-01), Mehra et al.
patent: 5912202 (1999-06-01), Oskam et al.
patent: 6579998 (2003-06-01), Sita et al.
patent: 2004/0110632 (2004-06-01), Sita et al.
patent: 2004/0186253 (2004-09-01), Sita
patent: 0 283 739 (1988-09-01), None
patent: WO 87/03887 (1987-07-01), None
Chien, J.C.W. et al., “Homogeneous Binary Zirconocenium Catalyst Systems for Propylene Polymerization. 1. Isotactic/Atactic Interfacial Compatibilized Polymers Having Thermoplastic Elastomeric Properties,”Macromolecules 30:3447-3458, American Chemical Scoiety (1997).
Chien, J.C.W. et al., “Homogeneous Binary Zirconocenium Catalysts for Propylene Polymerization. II. Mixtures of Isospecific and Syndiospecific Zirconocene Systems,”J. Polym. Sci. Part A 37:2439-2445, John Wiley & Sons, Inc. (1999).
Hlatky, G.G. et al., “Ionic, Base-Free Zirconocene Catalysts for Ethylene Polymerization,”J. Am. Chem. Soc. 111:2728-2729, American Chemical Society (1989).
Jayaratne, K.C. and Sita, L.R., “Stereospecific Living Ziegler—Natta Polymerization of 1-Hexene,”J. Am. Chem. Soc. 122:958-959, American Chemical Society (2000).
Jayaratne, K.C. et al., “Living Ziegler—Natta Cyclopolymerization of Nonconjugated Dienes: New Classes of Microphase-Separated Polyolefin Block Copolymers via a Tandem Polymerization/Cyclopolymerization Strategy,”J. Am. Chem. Soc. 122:10490-10491, American Chemical Society (2000).
Jayaratne, K. C. and Sita, L. R., “Direct Methyl Group Exchange Between Cationic Zirconium Ziegler-Natta Initiators and Their Living Polymers: Ramifications for the Production of Stereoblock Polyolefins,”J. Am. Chem. Soc. 123:10754-10755, American Chemical Society (2001).
Keaton, R.J. et al., “Structural Characterization of Zirconium Cations Derived from a Living Ziegler—Natta Polymerization System: new Insights Regarding Propagation and Termination Pathways for Homogeneous Catalysts,”J. Am. Chem. Soc. 122:12909-12910, American Chemical Society (2000).
Keaton, R.J. et al., “Dramatic Enhancement of Activities for Living Ziegler—Natta Polymerizations Mediated by ‘Exposed’ Zirconium Acetamidinate Initiators: The Isospecific Living Polymerization of Vinylcyclohexane,”J. Am. Chem. Soc. 123:6197-6198, American Chemical Society (2001).
Lieber, S. and Brintzinger, H.-H., “Propene Polymerization with Catalyst Mixtures Containing Differentansa-Zirconocenes: Chain Transfer to Alkylaluminum Cocatalysts and Formation of Stereoblock Polymers,”Macromolecules 33:9192-9199, American Chemical Society (2000).
Przybyla, C. and Fink, G., “Two different, on the same silica supported metallocene catalysts, activated by various trialkylaluminums—a kinetic and morphological study as well as an experimental investigation for building stereoblock polymers,”Acta Polym. 50:77-83, Wiley-VCH Verlag GmbH (1999).
Sita, L.R. et al., “Mechanistic and Materialistic Aspects of Living Ziegler-Natta Polymerization by Amidinate-Based Catalysts,” abstract from International Symposium on Olefin Metathesis (ISOM) XIV, Cambridge, MA, Aug. 5-9, 2001 (presented Aug. 8, 2001).
Sita, L.R. et al., “Mechanistic and Materialistic Aspects of Living Ziegler-Natta Polymerization by Amidinate-Based Catalysts,” slides presented at International Symposium on Olefin Metathesis (ISOM) XIV, Cambridge, MA, Aug. 5-9, 2001 (presented Aug. 8, 2001).
International Search Report for International Patent Application No. PCT/US02/22923, 3 pages, mailed Oct. 3, 2002.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method for production of multimodal polyolefins of tunable... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for production of multimodal polyolefins of tunable..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for production of multimodal polyolefins of tunable... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3536881

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.