Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Reexamination Certificate
1994-03-10
2004-11-30
Bell, Mark L. (Department: 1755)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
C556S008000, C556S010000, C556S011000, C556S019000, C556S052000
Reexamination Certificate
active
06825369
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to compositions of matter which are useful as catalysts, to a method for preparing these catalysts and to a method of using these catalysts. More particularly, this invention relates to catalyst compositions, to a method of preparing these catalyst compositions, to a method for polymerizing addition polymerizable monomers using the present catalysts.
In U.S. Ser. No. 8,800, filed Jan. 30, 1987 and now abandoned (published in equivalent form as EP 277,004) there are disclosed certain bis(cyclopentadienyl) metal compounds formed by reacting a bis(cyclopentadienyl) metal complex with salts of Bronsted acids containing a non-coordinating compatible anion. The reference discloses the fact that such complexes are usefully employed as catalysts in the polymerization of olefins. For the teachings contained herein the aforementioned U.S. Ser. No. 8,800 (now abandoned) and EP 277,004 are herein incorporated in their entirety by reference thereto.
Despite the utility of the catalysts disclosed in the above prior art references it is desirable to produce even more efficient and useful catalysts for addition polymerizations. In particular the present investigations have led to certain improved metal complex containing compounds that are highly active as polymerization catalysts and desirably allow for the polymerization of a wide variety of monomers and mixtures of monomers.
SUMMARY OF THE INVENTION
According to the present invention there is now provided a monocyclopentadienyl or substituted monocyclopentadienyl metal complex containing compound useful as an olefin polymerization catalyst corresponding to the formula:
CpMX
n
+
A
−
wherein:
Cp is a single &eegr;
5
-cyclopentadienyl or &eegr;
5
-substituted cyclopentadienyl group optionally covalently bonded to M through a substituent;
M is a metal of Group 3-10 or the Lanthanide Series of the Periodic Table bound in an &eegr;
5
bonding mode to the cyclopentadienyl or substituted cyclopentadienyl group;
X each occurrence independently is selected from the group consisting of hydride, halo, alkyl, aryl, silyl, germyl, aryloxy, alkoxy, amide, siloxy, neutral Lewis base ligands and combinations thereof having up to 20 non-hydrogen atoms, and optionally one X together with Cp forms a metallocycle with M;
n is one or two depending on the valence of M; and
A
−
is a noncoordinating, compatible anion of a Bronsted acid salt.
Such compounds are usefully employed in Ziegler-Natta type polymerization processes to prepare polymers for molding, film, sheet, extrusion foaming and other applications. The compounds may also be utilized in hydrogenation reactions, catalytic cracking and other industrial processes.
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Neithamer David R.
Stevens James C.
Pasterczyk J.
The Dow Chemical Company
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