Novel catalysts for the ring‐opening metathesis polymerization of norbornene‐type monomers

Abstract

AbstractA novel family of metallate compounds has been developed for use in catalyst systems for the ring‐opening polymerization of dicyclopentadiene (DCPD) and other norbornene‐type monomers. Examples of these novel catalyst compounds are the organoammonium isopoly‐and heteropolymetallates. Applications of these metallates in combination with alkylaluminum‐type reducing cocatalysts are found in the production of both solution polymers, and cross‐linked resins from reaction injection molding (RIM). These catalyst systems have significant advantages over prior art catalysts. They are highly soluble in DCPD and other norbornene‐type monomers, thus eliminating the need for a reaction solvent. They also are insensitive to air and moisture, have unlimited shelf‐life in solution in norbornene‐type monomers, and do not function as Lewis acids. The chemistry of these catalyst systems is discussed, along with the benefits they provide to the properties of the final polymer products. © 1993 John Wiley & Sons, Inc.