Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Reexamination Certificate
1999-02-22
2003-05-06
Bell, Mark L. (Department: 1755)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
C502S103000, C502S123000
Reexamination Certificate
active
06559088
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to the use of catalyst system for the polymerization of olefins, particularly, to catalyst system comprising supported, often with MgCl
2
, Ziegler-Natta catalyst which has been modified with an amine, preferably during synthesis. The catalyst system is used to polymerize monomer having at least one Ziegler-Natta polymerizable bond, particularly olefin, especially &agr;-olefin, such as ethylene, propylene or their combinations with or without other monomer.
BACKGROUND OF THE INVENTION
It is known that polyolefin manufacturing or production processes typically involve the polymerization of olefin monomer with an organometallic catalyst of the Ziegler-Natta type. Catalyst systems for the polymerization of olefins are well known in the art. Generally, these systems include a Ziegler-Natta type, which may be called a conventional or multi-site, polymerization catalyst component and a co-catalyst, often an organoaluminum compound. Examples of such catalyst systems are shown in the following U.S. Patents the disclosures of which are hereby incorporated by reference.
It is known that Cp
2
TiCl
2
in the presence of alkylaluminum compounds polymerizes ethylene but not propylene whereas in the presence of methylalumoxane (MAO), Cp
2
TiCl
2
polymerizes propylene also to produce atactic polypropylene. Combination of dimethyl titanocene and its Cp-substituted analogues and TiCl
3
for propylene polymerizations has been reported in U.S. Pat. No. 2,992,212 and by G. A. Lock in “Thermoplastic Elastomers Based on Block Copolymers of Ethylene and Propylene”,
Advances in Polyolefins
(Seymour, Raymond B., ed.) at pages 59-74. MAO was not used in this polymerization.
Typically catalysts for traditional polymerization of olefin monomer include a Ziegler-Natta-type polymerization catalyst component, a co-catalyst which is generally an organoaluminum compound, and an external electron donor or selectivity control agent, often an organosilicon compound. Such catalysts are described in U.S. Pat. Nos. 4,107,413; 4,294,721; 4,439,540; 4,115,319; 4,220,554; 4,460,701; and 4,562,173.
A Ziegler-Natta type polymerization catalyst is basically a complex derived from a halide of a transition metal, for example, titanium, chromium or vanadium with a metal hydride and/or a metal alkyl, typically an organoaluminum compound, as a co-catalyst. The catalyst is usually comprised of a titanium halide supported on a magnesium compound complexed with an alkylaluminum co-catalyst.
SUMMARY OF THE INVENTION
Our invention provides, at least, new Ziegler-Natta type polymerization catalyst with useful characteristics and ability to make useful polymer.
Use of our catalyst and practice of other aspects of our invention also yields useful and unusual polymer properties in polymerization processes using a supported Ziegler-Natta catalyst which has been modified with an amine compound.
We also provide, with this invention, ability to produce Ziegler-Natta polymerized polymer having low molecular weight and narrow molecular weight distribution.
Additionally, our invention improves catalyst activity by modifying the catalyst, usefully this is performed during synthesis.
These and other objects are accomplished by use of catalyst system comprising a supported Ziegler-Natta catalyst modified with Group 15 compound, preferably amine, in polymerization process for polymerizing monomer having at least one Ziegler-Natta polymerizable bond, notably olefins, especially ethylene.
REFERENCES:
patent: 4211671 (1980-07-01), Hoff
patent: 4496660 (1985-01-01), Gessell et al.
patent: 4499198 (1985-02-01), Pullukat et al.
patent: 4544646 (1985-10-01), Pullukat et al.
patent: 4892914 (1990-01-01), Hefner
patent: 5039766 (1991-08-01), Sasaki et al.
patent: 5194534 (1993-03-01), Bell
patent: 5258476 (1993-11-01), Sasaki et al.
patent: 5529966 (1996-06-01), Luciani et al.
patent: 5565396 (1996-10-01), Frey et al.
patent: 6017842 (2000-01-01), Rosen et al.
patent: 6232256 (2001-05-01), Yang et al.
patent: 6306984 (2001-10-01), Agapiou et al.
patent: 757.988 (1971-04-01), None
patent: 2 030 753 (1971-02-01), None
patent: 0044665 (1982-01-01), None
patent: 0 104 374 (1984-04-01), None
patent: 0104374 (1984-04-01), None
patent: 40-15980 (1965-07-01), None
patent: 41-5379 (1966-03-01), None
patent: 42-11646 (1967-07-01), None
Y. Tajima et al., J. Polym. Sci., Polym. Chem. Ed., vol. 6, No. 1, pp. 241-242 (1968).
Chen Hong
Lopez Margarito
Shamshoum Edwar Shoukri
Bell Mark L.
Conley Rose & Tayon
Fina Technology, Inc.
Pasterczyk J.
LandOfFree
Ziegler-Natta catalyst with amine for polymerization does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ziegler-Natta catalyst with amine for polymerization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ziegler-Natta catalyst with amine for polymerization will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3031431