CATALYSTS FOR CROSSLINKING EPOXY RESINS

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A compound of formula (I) : MXy, alone or in combination with a compound of formula (II) : MXzL, useful as a catalyst for accelerating the crosslinking of a reactive epoxy monomer, oligomer or polymer to form an epoxy thermoset resin, is provided. In formulas (I) and (II), M represents a rare earth metal cation, X represents an anion of formula R-Z-O", wherein R represents a hydrocarbon radical optionally substituted with one or more halogen atom and -Z- represents -S(=O)2- or -O-S(=O)2-, z = y +1, and L represents Na+, H+, or a combination thereof.