Patent ID: 8188209

Claim:
A polyimide resin comprising the following recurring units (1), (2) and (3); in which A is a divalent residue obtainable from a diisocyanate compound by removing two isocyanate groups thereof; W is a divalent residue obtainable from a diol compound having a carboxyl group by removing two hydroxyl groups thereof; R 1 is a divalent aliphatic or aromatic hydrocarbon group and R 2 is a divalent aliphatic hydrocarbon group; X is a tetravalent residue obtainable from a tetracarboxylic acid compound by removing all carboxyl groups thereof; Y is a divalent group obtainable from a diamine compound by removing two amino groups thereof; n is an integer of 1 to 40, m is an integer of 1 to 20, each of s and u independently is an integer of 1 to 100, and t is an integer of 1 to 100.