| 摘要 |
PURPOSE:To obtain the subject film excellent in heat resistance, chemical resistance and flexibility by grinding a thermosetting resin composition having fluidity in a molten state followed by scattering the resultant powder on a base film, and then executing a heat treatment to convert said powder to a filmy product. CONSTITUTION:A dry blend comprising a copolyester resin made from terephthalic acid, ethylene glycol and neopentyl glycol, an epsilon-caprolactam-blocked isocyanate, a curing promoter, and a spreading agent is kneaded in a molten state to produce a thermosetting resin composition, which is, in turn, ground into powder. The powder is then uniformly scattered onto a thermoplastic resin film. The resultant film is heat-treated at a temperature not lower than the temperature at which the above composition becomes fluid and settable, but lower than the melting temperature of the above film to convert the powder to a filmy product, thus obtaining the objective film suitable as an electrical insulating film such as for capacitors or motors, or for flexible printed boards. |
