Patent ID: 7189488

Claim:
A polyimide precursor resin composition, comprising: a polyamide precursor (A) containing at least one first structural unit (1); and a polyimaide (B) containing at least one second structural unit (2), where R 1 is a tetravalent organic group, R 2 is a divalent organic group, R 3 is a monovalent organic group, and m is an integer greater than or equal to 1, where R 4 is a tetravalent organic group, R 5 is a divalent organic group, and n is an integer greater than or equal to 1, wherein the polyimide precursor resin composition has positive-type photosensitivity, wherein the polyimide precursor resin composition contains a photo acid generator within a range of from 0.3 to 50 weight parts per combined 100 weight parts of the polyimide precursor (A) and the polyimide (B), wherein the photo acid generator has the property of producing acid on illumination by light and said property imparting to said polyimide precursor resin composition such positive-type photosensitivity that parts of said precursor resin composition when exposed to said light becomes removable by development with aqueous alkaline solution.