Patent ID: 7239030

Claim:
A flexible wiring board for tape carrier package having improved flame resistance, comprising an insulating film having a bending slit, a wiring pattern formed on the insulating film and crossing the bending slit, an adhesive layer adhering the wiring pattern to the insulating film, a flex resin layer protecting at least one side of the wiring pattern at the bending slit, and an overcoat layer protecting a region where the wiring pattern is formed; wherein the overcoat layer is a layer of cured material of a curable resin composition having such a property that, when cured into a form of film, the film has an initial modulus of 10 to 1,500 MPa at 25° C., an electrical insulation of sufficient level, a soldering resistance of 10 seconds at 260° C., and an oxygen index exceeding 22.0.