Metallocene and catalyst used for the preparation of chemically homogeneous cycloolefin copolymers
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United States of America Patent
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Jan 2, 2001
Grant Date -
N/A
app pub date -
Apr 14, 1997
filing date -
Mar 9, 1991
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Abstract
Chemically homogeneous cycloolefin copolymers of polycyclic olefins, such as, for example, norbornene or tetracyclododecene, with cycloolefins and/or acyclic olefins are obtained without ring opening and in a high space-time yield if a catalyst system is used which comprises an aluminoxane and a stereorigid metallocene compound of an element from groups IVb to VIb, of the formula ##STR1## the part of the metallocene molecule formed by M.sup.1 and the substituents R.sup.16 -R.sup.17 having C.sub.1 -symmetry or being in the meso-form.
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