AbstractCatalytic activities of benzyl sulfonium salts with nonnucleophilic anions (BF4−,PF6−,AsF6−,SbF6−) for epoxy polymerization were examined. The order of reactivities correlated well with nonnucleophilicity of anions. Epoxy resins catalyzed by these salts are characterized by longer shelf‐life and shorter gel time at high temperature. Some physical properties of cured product were compared with those cured by a commonly used BF3amin
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