Patent ID: 7629111

Claim:
A method for manufacturing a liquid discharge head including a flow path which communicates with a discharge port used to discharge a liquid, and a substrate on which an energy generating element for generating energy that is used to discharge liquid is arranged, the method comprising: providing, on the substrate, a first positive type photosensitive material layer that is exposed to ionizing radiation of a first wavelength; providing, on the first positive type photosensitive material layer, a second positive type photosensitive material layer of a composition containing a copolymer of methacrylic anhydride and methacrylate ester and that is exposed to ionizing radiation of a second wavelength that is different from the first wavelength; heating the second positive type photosensitive material layer at a temperature of 120° C. to 150° C.; patterning the heated second positive type photosensitive material layer to form a second solid layer for forming a part of the flow path by irradiating the ionizing radiation of the second wavelength to the second positive type photosensitive material layer; irradiating the ionizing radiation of the first wavelength to the first positive type photosensitive material layer to form a first solid layer for forming another part of the flow path; providing a coating layer so as to coat the first and second solid layers; forming the discharge port reaching the second solid layer through a photolithographic process comprising exposing and developing the coating layer; and removing the first and second solid layers to form a the flow path, wherein a material used for the coating layer contains a cationically polymerizable chemical compound, a cationic photopolymerization initiator and an inhibitor of cationic photopolymerization.