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
2002-01-09
2003-05-13
Seaman, D. Margaret (Department: 1625)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
C502S167000, C546S002000, C546S178000, C546S179000, C546S261000
Reexamination Certificate
active
06562750
ABSTRACT:
BACKGROUND
A variety of metallocenes and single site-like catalysts have been developed to prepare olefin polymers. Metallocenes are organometallic coordination complexes containing one or more &pgr;-bonded moieties (i.e., cyclopentadienyl groups) in association with a metal atom from Groups IIIB to VIII or the Lanthanide series of the Periodic Table of Elements. Catalyst compositions containing metallocenes and single site-like catalysts are highly useful in the preparation of polyolefins, producing relatively homogeneous copolymers at excellent polymerization rates while allowing one to tailor closely the final properties of the polymer as desired.
U.S Pat. No. 5,280,000 to Kakugo et al. discloses a catalyst composition for the polymerization of high molecular weight olefins consisting of a transition metal compound of the formula M(R)
1
(OR′)
m
X
n
−(1+m) (wherein M is a transition metal atom, R and R′ are hydrocarbyl groups of 1-20 carbons, X is a halogen, ≧0, m>0, n−(1+m)≧0, and n is the valence of the transition metal), an aluminoxane, and optionally an organic compound having at least two hydroxyl groups and optionally an aryl group. A new single site-like, olefin polymerization catalyst composition is described herein having good polymerization activity and productivity, which is easily and inexpensively prepared. The catalyst composition comprises a bis(hydroxy aromatic nitrogen ligand) transition metal catalyst precursor that is activated with a cocatalyst such as an aluminoxane.
SUMMARY OF THE INVENTION
The invention provides catalyst precursor having a formula selected from the group consisting of:
and
wherein M is a metal selected from the group consisting of Group IIIB to VIII and Lanthanide series elements; each X is a monovalent or bivalent anion; o is 0,1, 2, or 3 depending on the valence of M; each R
1
, R
2
, R
3
, and R
4
is a hydrocarbon group containing 1 to 20 carbon atoms and two or more adjacent R
1
, R
2
, R
3
, or R
4
groups may be joined to form an aliphatic, aromatic, or heterocyclic ring; Y is a bivalent bridging group or a bond; each m is independently from 0 to 4; and n is 0 or 1.
The invention also provides a catalyst composition comprising the above catalyst precursor and an activating cocatalyst.
The invention further provides a process for producing an olefin polymer, which comprises contacting an olefin monomer under polymerization conditions with the above catalyst composition, as well as olefin polymers, such as ethylene polymers, produced by this process.
REFERENCES:
patent: 5852146 (1998-12-01), Reichle et al.
patent: 6093824 (2000-07-01), Reichle et al.
patent: 6380390 (2002-04-01), Reichle et al.
Karol Frederick John
Reichle Walter Thomas
Seaman D. Margaret
Univation Technologies
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