Patent ID: 8162440

Claim:
An inkjet printhead, comprising: a substrate having an ink feed hole; a chamber layer formed on the substrate, wherein the chamber layer comprises a plurality of ink chambers in which ink supplied from the ink feed hole is filled; and a nozzle layer formed on the chamber layer, wherein the nozzle layer comprises a plurality of nozzles through which ink is ejected, wherein the chamber layer and the nozzle layer are formed of cured products of a first negative photoresist composition and a second negative photoresist composition, wherein the first negative photoresist composition and the second negative photoresist composition comprise a bisphenol-A novolac epoxy resin represented by Formula 1; at least one epoxy resin selected from a first epoxy resin represented by Formula 2; and a second epoxy resin represented by Formula 3; a cationic photoinitiator; and a solvent: wherein k, p, n and m are each independently an integer of 1 to 30; and wherein R 1 through R 24 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a nitro group, a cyano group, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 1 -C 20 carboxyl group, a substituted or unsubstituted C 1 -C 20 alkylsiloxane group, a substituted or unsubstituted C 1 -C 20 alkoxy group, a substituted or unsubstituted C 2 -C 20 alkenyl group, a substituted or unsubstituted C 2 -C 20 alkynyl group, a substituted or unsubstituted C 1 -C 20 heteroalkyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 7 -C 30 arylalkyl group, a substituted or unsubstituted C 5 -C 30 heteroaryl group, or a substituted or unsubstituted C 3 -C 30 heteroarylalkyl group.