Metallocene-catalyzed process for the manufacture of EP and EPDM polymers
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United States of America Patent
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Apr 8, 2003
Issued Date -
N/A
app pub date -
Jul 12, 1996
filing date -
Dec 30, 1991
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Abstract
Ethylene, an .alpha.-olefin and, optionally, a diene monomer are polymerized in a process comprising the step of contacting (1) ethylene, (2) at least one C.sub.3 -C.sub.20 aliphatic .alpha.-olefin, (3) optionally, at least one C.sub.4 -C.sub.20 diene, (4) a catalyst comprising (a) a metallocene complex, and (b) an activator, and (5) a solvent. The process is conducted in either a single reactor or in multiple reactors, the latter configured either in series or parallel. Solvent is removed from the polymer stream in an anhydrous, first stage solvent recovery operation such that the solids concentration of the product stream is increased by at least 100 percent. Additional solvent is removed in an anhydrous, second stage solvent recovery operation from the product of the first stage solvent recovery operation such that the solids concentration of the product stream is in excess of 65 weight percent.
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