Patent ID: 8604612

Claim:
A flip chip attach adhesive, comprising: 100 parts by weight of an epoxy-based dielectric material that does not include any photoacid generator; 6 to 16 parts by weight of an epoxy resin selected from the group consisting of diglycidyl 1,2-cyclohexanedicarboxylate, bis(3,4-epoxycyclohexylmethyl)adipate, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, and blends thereof; 0.1 to 0.6 parts by weight of a bis(4-alkylphenyl)iodonium hexafluoroantimonate photoacid generator; and a positive amount of up to 0.1 part by weight of copper naphthenate cold catalyst, allowing the photoacid generator to operate as a thermal epoxy catalyst.