Patent ID: 8304149

Claim:
A photosensitive polymer composition, comprising: (a) a polymer selected from (i) polyimide precursors that contain repeating units of the following general formula (I) where R 1 represents a tetra-valent aliphatic group, R 2 represents a di-valent organic group, and two R 3 s represent each independently a hydrogen atom or a mono-valent organic group, wherein the polyimide precursors have substantially no amino group (—NH 2 ) at any end thereof, and wherein one or more of R 1 , R 2 and COOR 3 contains a protected acid group and an acid-protecting group therefor, and (ii) polyimides having substantially no amino group (—NH 2 ) at the end, and having repeating units of the following general formula (II): where R 4 represents a tetra-valent aliphatic group, and R 5 represents a di-valent organic group, wherein one or more of R 4 and R 5 contains a protected acid group and an acid-protecting group therefor, wherein the polymer has no group capable of forming a cross-linkage into a polyimide during heat-treatment at any end thereof; and (b) a compound that generates an acid when exposed to light and is capable of detaching the acid-protecting group from the protected acid group.