Process for the production of cycloolefin random copolymer
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United States of America Patent
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Jul 22, 1997
Grant Date -
N/A
app pub date -
Dec 27, 1995
filing date -
Dec 28, 1994
priority date (Note) -
Expired
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Abstract
There is provided a process for the production of a cycloolefin copolymer which comprises copolymerizing an .alpha.-olefin having 2 or more carbon atoms and a specific cycloolefin in the presence of a specific metallocene type catalyst in a solvent mixture of a hydrocarbon solvent having a solubility parameter (value of .delta.) of 7.7 [(cal/cm.sup.3).sup.1/2 ] or more and a hydrocarbon solvent having a solubility parameter (value of .delta.) of 7.5 [(cal/cm.sup.3).sup.1/2 ] or less as a polymerization solvent. A cycloolefin copolymer having a high molecular weight can be produced in a high concentration by this process at a high yield.
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