Process for producing a liquid ejection head

A process for producing a liquid ejection head including, on a substrate, a flow path forming member that forms an ejection orifice for ejecting liquid and a liquid flow path communicating with the ejection orifice, the process comprising:

• (1) forming, on the substrate, a first layer made of a first photosensitive resin;
• (2) forming, on the first layer, a mask layer in which at least a part of a side surface part of the mask layer has a light transmission distribution with use of a material capable of reducing transmission of light having a photosensitive wavelength of the first photosensitive resin;
• (3) performing, for the first layer, a first exposure treatment with use of the mask layer as a mask and a first development treatment to form a flow path mold pattern that forms a mold of the liquid flow path, the flow path mold pattern having a taper angle θ that satisfies 95°<θ, where θ is the angle between a top surface and a side surface in a cross section of the flow path mold pattern perpendicular to a surface of the substrate;
• (4) forming a coating resin layer so as to cover the flow path mold pattern;
• (5) patterning the coating resin layer so as to form the flow path forming member having the ejection orifice;
• and
• (6) removing the flow path mold pattern to form the liquid flow path.