Patent ID: 7723444

Claim:
An epoxy resin composition which comprises an epoxy resin (A), a curing agent (B) which is a compound having two or more phenolic hydroxyl groups in a molecule, a curing accelerator which is a compound (C) having a cation portion in a molecule and a component (D) retarding curing of the epoxy resin which is at least one component selected from the group consisting of component (b′) and component (c′): (b′) an anion component represented by following general formula [1] and a compound represented by following general formula [2]: wherein X1 and X2 each represent an organic group and represent the same group or different groups, and Z1 represents a substituted or unsubstituted organic group having an aromatic ring or a heterocyclic ring or a substituted or unsubstituted aliphatic group, wherein X3 represents an organic group; (c′) the compound represented by above general formula [2] and a silane compound represented by following general formula [3]: wherein R1, R2 and R3 each represent an aliphatic group having 1 to 3 carbon atoms and may represent the same group or different groups, and Z2 represents a substituted or unsubstituted organic group having an aromatic ring or a heterocyclic ring or a substituted or unsubstituted aliphatic group.