Patent ID: 7378455

Claim:
A curable composition, comprising: an epoxy resin; an effective amount of a cure catalyst comprising a first latent cationic cure catalyst comprising a diaryl iodonium hexafluoroantimonate salt; and a second latent cationic cure catalyst comprising a diaryl iodonium cation, and an anion selected from perchlorate, imidodisulfurylfluoride anion, unsubstituted and substituted (C 1 -C 12 )-hydrocarbylsulfonates, (C 2 -C 12 )-perfluoroalkanoates, tetrafluoroborate, unsubstituted and substituted tetra-(C 1 -C 12 )-hydrocarbylborates, hexafluorophosphate, hexafluoroarsenate, tris(trifluoromethylsulfonyl)methyl anion, bis(trifluoromethylsulfonyl)methyl anion, bis(trifluoromethylsulfuryl)imide anion, and combinations thereof; and a cure co-catalyst selected from free-radical generating aromatic compounds, peroxy compounds, copper (II) salts of aliphatic carboxylic acids, copper (II) salts of aromatic carboxylic acids, copper (II) acetylacetonate, and combinations thereof; and about 70 to about 95 weight percent of an inorganic filler, based on the total weight of the curable composition.