Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-08-28
2000-12-12
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526126, 526134, 526135, 526145, 526170, 526113, 526943, 526114, 502152, 502155, 502154, 556 12, C08F 442
Patent
active
061600652
DESCRIPTION:
BRIEF SUMMARY
This invention relates to metal complexes and to addition polymerization catalysts formed therefrom that have improved catalytic performance. More particularly the present invention relates to an addition polymerization catalyst composition comprising a yttrium complex of a dibenzopyrrole substituted cyclopentadienyl or substituted cyclopentadienyl ligand. In addition, the present invention relates to a method of using the foregoing catalyst compositions in an addition polymerization process for polymerizing addition polymerizable monomers.
In EP-A-416,815 there are disclosed certain constrained geometry metal complexes and catalysts derived by reacting the metal complex with activating cocatalysts. Supported derivatives of such catalysts were prepared by contacting them with a support such as alumina, silica or MgCl.sub.2. In U.S. Pat. No. 5,464,906 there are disclosed certain catalyst compositions comprising bridged Group 3 metal complexes, especially scandium containing complexes that were usefully employed as catalysts in addition polymerizations.
It would be desirable if there were provided an improved catalyst composition comprising a yttrium metal complex as well as an improved addition polymerization process utilizing such catalyst compositions.
As a result of investigations carried out by the present inventor there have now been discovered certain dibenzopyrrole substituted cyclopentadienyl complexes of yttrium corresponding to the formula: ##STR1## wherein Y is yttrium; hydrogen, hydrocarbyl, silyl, or germyl, said R having up to 20 non-hydrogen atoms, or adjacent R groups are linked together thereby forming a fused ring system; and formula, --(ER'.sub.2).sub.m --, wherein E independently each occurrence is carbon, silicon or germanium, R' independently each occurrence is selected from the group consisting of hydrocarbyl, hydrocarbyloxy, silyl, and germyl of up to 20 atoms other than hydrogen, and m is an integer from 1 to 3,
In addition there is provided an improved method for polymerization of addition polymerizable monomers using a catalyst composition comprising one or more of the foregoing metal complexes. Such addition polymerization processes may be used to prepare polymers for use in making molded articles, films, sheets, foamed materials and in other industrial applications.
All reference to the Periodic Table of the Elements herein shall refer to the Periodic Table of the Elements, published and copyrighted by CRC Press, Inc., 1989. Also, any reference to a Group or Groups shall be to the Group or Groups as reflected in this Periodic Table of the Elements using the IUPAC system for numbering groups.
Preferred R groups in the foregoing formula include straight and branched alkyl radicals, cycloalkyl radicals, aryl radicals, alkyl-substituted cycloalkyl radicals, and alkyl-substituted aromatic radicals. In addition two or more such radicals may together form a fused ring system which may be saturated or unsaturated. Examples of the latter are indenyl-, tetrahydroindenyl-, fluorenyl-, and octahydrofluorenyl- groups. Additional preferred radicals include trimethylsilyl, triethylsilyl, ethyldimethylsilyl, methyldiethylsilyl, triphenylgermyl, and trimethylgermyl radicals.
Preferred cyclic .pi.-bonded groups include, cyclopentadienyl, indenyl, fluorenyl, tetrahydroindenyl, tetrahydrofluorenyl, octahydrofluorenyl, and C.sub.1-10 hydrocarbyl-substituted derivatives thereof. Most preferred cyclopentadienyl based groups are tetramethylcyclopentadienyl, 2-methylindenyl, 3-methylindenyl, 2,3-dimethylindenyl, 2,3,5,6-tetramethylindenyl, and 2,3,5,6,7-pentamethylindenyl. It is understood that when substituted with the divalent substituent Z, the foregoing L groups are the corresponding divalent derivatives of the specifically named groups substituted at a ring position with the Z ligand.
Preferred Z groups are dimethylsilanediyl, diphenylsilanediyl, methylisopropoxysilanediyl, methylphenylsilanediyl, methylene, and 1,2-ethanediyl.
Examples of highly preferred complexes according to the present inventi
REFERENCES:
patent: 4965386 (1990-10-01), Watson et al.
patent: 5312881 (1994-05-01), Marks et al.
patent: 5464906 (1995-11-01), Patton et al.
Patton Jasson T.
Soto Jorge
Choi L
The Dow Chemical Company
Wu David W.
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