Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-02-19
2000-01-18
Nazario-Gonzalez, Porfirio
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
556 11, 556 13, 556 19, 556 20, 556 52, 556 53, 526130, 526134, 526160, 526943, 502103, 502117, C08F 4643, C07F 1700, B01J 3100
Patent
active
060158689
DESCRIPTION:
BRIEF SUMMARY
This invention relates to class of Group 4 metal complexes and to olefin polymerization catalysts derived therefrom that are particularly suitable for use in a polymerization process for preparing polymers by polymerization of .alpha.-olefins and mixtures of .alpha.-olefins.
Constrained geometry metal complexes and methods for their preparation are disclosed in EP-A-416,815; EP-A-468,651; EP-A-514,828; EP-A-520,732 and WO93/19104, as well as U.S. Pat. Nos. 5,055,438, 5,057,475, 5,096,867, 5,064,802, 5,132,380, and WO95/00526.
According to the present invention there are provided metal complexes corresponding to the formula: ##STR1## wherein:
M is titanium, zirconium or hafnium in the +2, +3 or +4 formal oxidation state;
A' is a substituted indenyl group substituted in at least the 2 or 3 position with a group selected from hydrocarbyl, fluoro-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, dialkylamino-substituted hydrocarbyl, silyl, germyl and mixtures thereof, said group containing up to 40 nonhydrogen atoms, and said A' further being covalently bonded to M by means of a divalent Z group;
Z is a divalent moiety bound to both A' and M via .sigma.-bonds, said Z comprising boron, or a member of Group 14 of the Periodic Table of the Elements, and also comprising nitrogen, phosphorus, sulfur or oxygen;
X is an anionic or dianionic ligand group having up to 60 atoms exclusive of the class of ligands that are cyclic, delocalized, .pi.-bound ligand groups;
X' independently each occurrence is a neutral Lewis base ligating compound, having up to 20 atoms;
p is 0, 1 or 2 and is two less than the formal oxidation state of M, with the proviso that when X is a dianionic ligand group, p is 1; and
q is 0, 1 or 2.
The above complexes may exist as isolated crystals optionally in pure form or as a mixture with other complexes, in the form of a solvated adduct, optionally in a solvent, especially an organic liquid, as well as in the form of a dimer or chelated derivative thereof, wherein the chelating agent is an organic material, preferably a neutral Lewis base, especially a trihydrocarbylamine, trihydrocarbylphosphine, or halogenated derivative thereof.
Further according to the present invention there is provided a process for preparing polymers of olefin monomers comprising contacting one or more such monomers with a catalyst comprising:
1) a metal complex corresponding to the formula: ##STR2## wherein:
M is titanium, zirconium or hafnium in the +2, +3 or +4 formal oxidation state;
A' is a substituted indenyl group substituted in at least the 2 or 3 position with a group selected from hydrocarbyl, fluoro-substituted hydrocarbyl, hydrocarbyloxy-substituted hydrocarbyl, dialkylamino-substituted hydrocarbyl, silyl, germyl and mixtures thereof, said group containing up to 40 nonhydrogen atoms, and said A' further being covalently bonded to M by means of a divalent Z group;
Z is a divalent moiety bound to both A' and M via .sigma.-bonds, said z comprising boron, or a member of Group 14 of the Periodic Table of the Elements, and also comprising nitrogen, phosphorus, sulfur or oxygen;
X is an anionic or dianionic ligand group having up to 60 atoms exclusive of the class of ligands that are cyclic, delocalized, .pi.-bound ligand groups;
X' independently each occurrence is a neutral Lewis base ligating compound, having up to 20 atoms;
p is 0, 1 or 2 and is two less than the formal oxidation state of M, with the proviso that when X is a dianionic ligand group, p is 1; and
q is 0, 1 or 2: and
2) an activating cocatalyst
the molar ratio of 1) to 2) being from 1:10,000 to 100:1, or
the reaction product formed by converting 1) to an active catalyst by use of an activating technique.
The present catalysts and process result in the highly efficient production of high molecular weight olefin polymers over a wide range of polymerization conditions, and especially at elevated temperatures. They are especially useful for the solution polymerization of ethylene/propylene (EP polymers) and ethylene/propylene/diene (EPDM polym
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Friedrichsen Bernard P.
McAdon Mark H.
Nickias Peter N.
Patton Jasson T.
Soto Jorge
Nazario-Gonzalez Porfirio
The Dow Chemical Company
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