Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Patent
1988-06-16
1989-10-03
Garvin, Patrick P.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
502108, 526129, C08F 464
Patent
active
048717053
ABSTRACT:
Disclosed is a process for preparing high molecular weight ethylene-.alpha.-olefin elastomers, preferably an ethylene-propylene elastomer, by liquid phase polymerization of the requisite monomers in the presence of a metallocene/alumoxane catalyst system. Preferably, the process is carried out as a slurry polymerization utilizing the metallocene/alumoxane catalyst in supported form on a silica gel support with the .alpha.-olefin monomer maintained in liquid state and used in excess to serve as a polymerization diluent. The metallocene component of the catalyst by which the process is practiced is of the formula: ##STR1## wherein M is zirconium, titanium or hafnium; each R.sup.1 independently is a C.sub.1 -C.sub.20 linear, branched or cyclic alkyl group or a C.sub.2 -C.sub.4 cyclic alkylene group which forms a fused ring system group; R.sup.2 is a C.sub.1 -C.sub.6 linear, branched or cyclic alkylene, a Si.sub.1 -Si.sub.2 alkyl substituted silanylene group or an alkyl substituted silaalkylene group; each X independently is an alkyl, aryl, halide, hydride or oxygen bridge of a zirconocene dimer; "y" is a number 2, 3 or 4, and "b" is a number 0 or 1. M is preferably zirconium. Most preferably, the supported zirconocene/alumoxane catalyst is prepolymerized with ethylene or another olefin to provide spherical, free-flowing catalyst particles which give free-flowing particulate elastomer product from the slurry polymerization.
REFERENCES:
patent: 4295991 (1981-10-01), Wristers
patent: 4658078 (1987-04-01), Slaugh et al.
patent: 4701432 (1987-10-01), Welborn
Exxon Chemical Patents Inc.
Garvin Patrick P.
Kurtzman M. B.
LandOfFree
Process for production of a high molecular weight ethylene a-ole does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for production of a high molecular weight ethylene a-ole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for production of a high molecular weight ethylene a-ole will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-664225