Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1995-04-21
1997-12-09
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526160, 526170, 5263486, 526904, 502103, 502117, 502121, 502123, 502124, 502125, C08F 464
Patent
active
056962134
ABSTRACT:
This invention is a solution process for the preparation of ethylene-.alpha.-olefin/diolefin copolymers comprising contacting ethylene, one or more .alpha.-olefin monomer, and optionally one or more diene monomer, with a catalyst system containing a catalyst activator and a Group 4 metallocene compound, comprising a) conducting the polymerization reaction at a temperature of about 60.degree. to 150.degree. C.; b) selecting as the Group 4 metallocene compound one or more members of the group consisting of cyclic monocyclopentadienyl Group 4 metal and covalently bridged (bis)indenyl hafnium metallocene compounds; and c) maintaining the .alpha.-olefin concentration at a molar ratio to that of ethylene of between about 0.3 to 7.0 and a diolefin to ethylene molar ratio of between about 0.01 and 0.4. In a preferred embodiment the process comprises: 1) mixing with a reaction solvent the one or more .alpha.-olefin monomer, the optional one or more diene monomer, and the catalyst activator, either together or separately, therafter 2) mixing with the reaction solvent an effective scavenging compound prior to or with introduction of the unactivated Group 4 metallocene compound under conditions such that the scavenging compound is in contact with the activator compound for a period of time not exceeding about 1 minute, and 3) contacting the activator compound with the unactivated Group 4 metallocene compound in the presence of said monomers. The process can be advantageously practiced a reaction temperature of at least 60.degree. C., preferably above 80.degree. C., most preferably above 110.degree. C., to achieve high number average molecular weight polymer having high .alpha.-olefin monomer and diene monomer contents with high diene conversion rates. The process is particularly suitable for the preparation of elastomeric ethylene-propylene or ethylene-propylene-diene monomer elastomers.
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Schiffino Rinaldo Soria
Zamora Javier Mario
Exxon Chemical Patents Inc.
Malpass Gerald D.
Miller Douglas W.
Muller William G.
Seidleck James J.
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