Patent ID: 7851128

Claim:
A photosensitive polymer composition, comprising: (a) a polymer selected from (i) polyimide precursors that contain repeating units of the following general formula (III): where R 1 represents a tetra-valent organic group, R 2 represents a di-valent organic group, two R 3 s represent each independently a hydrogen atom or a mono-valent organic group, R 6 represents a hydrogen atom or a mono-valent organic group, and R 7 represents a mono-valent organic group, and m represents an integer of 1 or more, 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 (IV): where R 4 represents a tetra-valent organic 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, and R 8 and R 9 represent a hydroxy group or a mono-valent alkoxy group or R 8 and R 9 represent that they are bonded to form —O—, and n represents an integer of 1 or more, 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, wherein at least some of the ends of the component (a) are composed of a protected amino group with an end-protecting group, wherein said end-protecting group can be detached from the protected amino group by heat-treatment at 400° C. or less.