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US 5,290,895 AGranted
Polymerized dienes prepared by step propagation, condensation type polymerization of acyclic dienes
AssigneeUniversity of Florida
InventorsKenneth B. Wagener, James M. Boncella, Robert P. Duttweiler, Marc A. Hillmyer, Jan G. Nel
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Abstract
Novel polymerized dienes prepared by the step propagation, condensation type polymerization of acyclic dienes employing Lewis acid-free metal alkylidene complexes as catalysts.
Claims1
A polymerized diene prepared by the step propagation, condensation type polymerization of an acyclic non-conjugated diene which comprises contacting said diene with a catalyst having the formula:
- ##STR6## wherein R.sub.1, R.sub.2 and R.sub.4 may be the same or different and are alkyl, aryl, aralkyl, haloalkyl, haloaryl, haloaralkyl or a silicon-containing analog thereof;
- R.sub.3 is alkyl, aryl, aralkyl or a substituent resulting from the reaction of the M.dbd.CH--R.sub.3 moiety of said catalyst with the acyclic non-conjugated diene being polymerized;
- and
- M is W or Mo
- at a temperature and for a time sufficient to effect said polymerization of said diene and recovering said polymerized diene.
2 more elements
Dependencies are inferred from the claim text.