| abstract |
The present invention aims to provide a polyimide resin excellent in heat resistance, dimensional stability, and toughness as an insulating layer, and to obtain a laminate suitable for a flexible wiring board by using the polyimide resin, the laminate being excellent in resistance to rupture and flexibility even when the thickness of a polyimide resin layer is small. Provided is a laminate for a wiring board having a metal layer on at least one surface of a polyimide resin layer. in which a polyimide resin layer (A) obtained by imidating a polyimide precursor resin having a weight average molecular weight of 150.000 to 800,000 is a main polyimide resin layer, and a polyimide resin of which the main polyimide resin layer is constituted has structural units represented by the following general formulae (1) and (2) where R represents a lower alkyl group, a phenyl group, or a halogen atom, and Ar1 represents a residue of bis(aminophenoxy)benzene or bis(aminophenoxy)naphthalene. |