Laminate for electronic material

本发明涉及无铅焊剂的接合所要求的吸湿后的耐热性好、适合柔性印刷电路板用或HDD悬架用的层合体。本发明的层合体由导体层和具有聚酰亚胺系树脂层(A)与聚酰亚胺系树脂层(B)的绝缘树脂层构成。构成绝缘树脂层的聚酰亚胺系树脂层(A)，由含有4，4′-二氨基-2，2′-二甲基联苯40摩尔％以上的二氨基化合物与芳香族四羧酸制得的聚酰亚胺系树脂构成，聚酰亚胺系树脂层(B)由含有从双(4-氨基苯氧基)苯或2，2-双[4-(4-氨基苯氧基)苯基]丙烷与均苯四甲酸、二苯甲酮四羧酸、二苯砜四羧酸或联苯四羧酸生成的结构单元80摩尔％以上的聚酰亚胺系树脂构成。 This invention relates to a laminate which is excellent in heat resistance after moisture absorption required in a lead-free solder joint, and is suitable for use in flexible printed wiring boards or HDD suspensions. The laminate for electronic materials of this invention is constituted of a conductor layer and an insulating resin layer having a polyimide-based resin layer (A) and a polyimide-based resin layer (B). The polyimide-based resin layer (A) constituting the insulating layer includes a polyimide-based resin obtained by reacting a diamine containing 40 mol% or more of 4,4'-diamino-2,2'-dimethylbiphenyl with an aromatic tetracarboxylic acid, and the polyimide-based resin layer (B) includes a polyimide-based resin containing 80 mol% or more of a structural unit generated from bis(4-aminophenoxy)benzene or 2,2-bisÄ4-(4-aminophenoxy)phenylÜpropane, and pyromellitic acid, benzophenonetetracarboxylic acid, diphenylsulfonetetracarboxylic acid or biphenyltetracarboxylic acid.