| 摘要 |
A method of manufacturing an ink jet head includes a process of forming a photodegradable positive type resist layer on a substrate having energy generating elements, a process of forming a structure which becomes an ink flow path by exposing and developing the photodegradable positive type resist layer, a process of coating the substrate having said structure with a negative type resist layer, a process of forming ink discharge ports in the negative type resist layer, and process of forming the ink flow path by removing said structure, wherein the photodegradable positive type resist layer includes an acrylic copolymer composition, containing at least a unit obtained from (meta) acrylic ester and further containing a unit obtained from (meta) acrylic acid. The acrylic copolymer composition contains the (meta) acrylic acid unit at a proportion of 5 to 30 weigth %, and weigth average molecular weigth of the acrylic copolymer ranges from 50000 to 300000.
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