Reactive end group containing polyimides and polyamic acids and photosensitive compositions thereof

A composition comprising:

• a) an end capped polyamic acid of the formula (IA) or an end capped polyimide of the formula (TB):
• wherein:
• m is an integer of at least 50;
• (from 50 to 2000, inclusive);
• n is an integer from 1 to 12, inclusive;
• X is one or more distinct tetravalent organic group;
• Y is one or more distinct divalent organic group, wherein Y is derived from one or more diamines selected from the group consisting of:
• R1 and R2 are the same or different and each independently of one another selected from the group consisting of hydrogen, linear or branched (C1-C16)alkyl, hydroxy(C1-C12)alkyl, perfluoro(C1-C12)alkyl, (C6-C10)aryl and (C6-C10)aryl(C1-C3)alkyl provided that both R1 and R2 are not hydrogen;
• or
• R1 and R2 taken together with the carbon atoms to which they are attached to form a 5 to 7 membered monocyclic ring or 6 to 12 membered bicyclic ring, said ring optionally containing one or more heteroatoms selected from O, N and S, and said rings optionally substituted with one or more groups selected from the group consisting of linear or branched (C1-C8)alkyl, (C6-C10)aryl, halogen, hydroxy, linear or branched (C1-C8)alkoxy and (C6-C10)aryloxy;
• and
• b) a photo radical generator.