Patent ID: 7485412
Filing Date: 2009-02-03
Classification: B41J

Abstract:
1. A method for manufacturing an ink jet head which includes a discharge port for discharging an ink droplet, an ink flow path communicated with the discharge port, and an energy generating element for discharging the ink droplet from the discharge port, the method for manufacturing an ink jet head comprising: a process of providing a photodegradable resin layer on a substrate having the energy generating element, the photodegradable resin layer including a binary acrylic copolymer composition, the binary acrylic copolymer composition containing a plurality of binary acrylic copolymers containing a unit obtained from (meth) acrylic ester as a main component, the binary acrylic copolymer further containing a unit obtained from (meth) acrylic acid, the binary acrylic copolymer composition containing the (meth) acrylic acid unit at a proportion of 5 to 30 weight %, and a weight average molecular weight of the binary acrylic copolymer ranging from 50000 to 300000; a process of intermolecular crosslinking acrylic copolymers, the number of carboxyl group used for the intermolecular crosslinking being not more than 20% of the number of carboxyl group included in the unit obtained from (meth) acrylic acid in the acrylic copolymer in the acrylic copolymer composition; a process of forming a structure which becomes the ink flow path by exposing and developing the photodegradable resin layer; a process of coating the substrate having the structure which becomes the ink flow path with a negative type photosensitive resin layer; a process of forming the ink discharge port in the negative type photosensitive resin layer; and a process of forming the ink flow path communicated with the discharge port by removing the structure which becomes the ink flow path, wherein a developing solution is used in the process of forming the structure which becomes the ink flow path, the developing solution containing glycol ether having carbon numbers not lower than 6, the glycol ether being mixable with water at an arbitrary proportion, a nitrogen-containing basic organic solvent, and water.