Patent ID: 8232476

Claim:
A flexible multilayer wiring board, comprising a flexible inner layer board obtained by forming an inner layer wiring on both sides of an insulating layer, an outer layer wiring situated on at least one side of the inner layer board, and at least one insulating adhesive sheet lying between the inner layer board and the outer layer wiring, wherein at least one of the insulating adhesive sheets consists of a polyamideimide obtained by reacting a diimidedicarboxylic acid mixture containing a diimidedicarboxylic acid represented by the following general formula (1a), a diimidedicarboxylic acid represented by the following general formula (1b) and a diimidedicarboxylic acid represented by the following general formula (1c), with an aromatic diisocyanate represented by the following chemical formula (2a), (2b), (2c), (2d) or (2e): Z 1 in formula (1a) is a divalent organic group represented by the following general formula (11), (12), (13), (14), (15), (16), (17) or (18), Z 2 in formula (1b) is a divalent organic group represented by the following general formula (21), (22), (23), (24), (25) or (26), R 1 and R 2 in formula (1c) are each independently a divalent organic group, R 3 , R 4 , R 5 and R 6 are each independently a C1-20 alkyl or C6-18 aryl group, and n 1 represents an integer of 1-50, X 1 in formula (23) is a C1-3 aliphatic hydrocarbon, C1-3 halogenated aliphatic hydrocarbon, sulfonyl, oxy, carbonyl or single bond, R 7 , R 8 and R 9 are each independently hydrogen, hydroxyl, methoxy, methyl or a halogenated methyl group, X 2 in formula (24) is a C1-3 aliphatic hydrocarbon, C1-3 halogenated aliphatic hydrocarbon, sulfonyl, oxy or carbonyl group, X 3 in formula (25) is a C1-3 aliphatic hydrocarbon, C1-3 halogenated aliphatic hydrocarbon, sulfonyl, oxy, carbonyl or single bond.