Patent ID: 8148831

Claim:
An epoxy resin composition comprising: (A) a compound having at least two epoxy groups in one molecule; (B) a compound having at least two phenolic hydroxyl groups in one molecule; and (C) a latent catalyst represented by the following formula (1): wherein A 1 represents a phosphorous atom; R 1 , R 2 , R 3 and R 4 each represent an organic group having a substituted or unsubstituted, aromatic or heterocyclic ring or represent a substituted or unsubstituted aliphatic group, and R 1 , R 2 , R 3 and R 4 may be the same or different from one another; X 1 represents an organic group that bonds to Y 1 and Y 2 ; X 2 represents an organic group that bonds to Y 3 and Y 4 ; Y 1 and Y 2 each represent a group resulting from a proton-donating substituent through release of a proton, and Y 1 and Y 2 bond to the silicon atom to form a chelate structure; Y 3 and Y 4 each represent a group resulting from a proton-donating substituent through release of a proton, and Y 3 and Y 4 bond to the silicon atom to form a chelate structure; X 1 and X 2 may be the same or different from each other; Y 1 , Y 2 , Y 3 and Y 4 may be the same or different from one another; and Z 1 represents an organic group having a substituted or unsubstituted, aromatic or heterocyclic ring or represents a substituted or unsubstituted aliphatic group.