| 摘要 |
PROBLEM TO BE SOLVED: To provide excellent heat resistance and flexibility, by specifying the softening point of unhardened heat resisting resin bonding agent, specifying the bonding strength of a laminated body, and specifying the radius of curvature indicating the curling property measured by etching a copper foil. SOLUTION: This material comprises the laminated body wherein a heat resisting film and a copper foils are attached with heat resisting resin bonding agent. The bonding strength of the laminated body at 180 deg.C is 0.5 kg/cm or more. The radius of curvature indicating the curling property measured by etching the copper foil is 100 mm or more. The softening point of the unhardened heat resisting resin bonding agent is 150 deg.C or less. In the heat resisting resin bonding agent, aromatic tetracarboxylic acids whose main component is biphenyl tetracarboxylic acids, the fusible polyimide siloxane obtained from diamino-polysiloxane and aromatic diamine, the epoxy compound having an epoxy substrate and the composition indulging epoxy hardening agent as a resin component are adequately used. |
