| 摘要 |
<p>This invention relates to a two component catalyst system for polymerization of metathesis polymerizable cycloolefins, comprising (a) a tungsten compound of the formula WOX4-x(OAr)x wherein X represents chlorine, bromine or fluorine, Ar represents a hindered phenyl ring having 1-5 substituents and x = 1, 2 or 3; and (b) an activator compound that preferably is triphenyltin hydride or trialkyltin hydride, preferably a tributyltin hydride. Among the preferred molecules or groups that are substituted on the phenyl ring of the tungsten compound include chlorine, bromine, phenyl, methoxy and isopropyl. Ar may also represent a multisubstituted phenyl group such as 2,4-dichloro-6-methyl phenyl.</p> |
