To provide a high permittivity insulation sheet with satisfactory flexibility, heat resistance and permittivity.
By the production method comprising: a stage (A) where a plurality of sheet-shaped formed bodies comprising polytetrafluoroethylene, high permittivity particles and a forming assistant are superimposed, and rolling is performed; and a stage (B) where, from the obtained rolled sheet, the forming assistant is removed, a high permittivity insulation sheet is produced. Preferably, the production method, after the stage (A), further comprises a stage (D) where a plurality of rolled sheets of the sheet-shaped formed bodies are superimposed, and rolling is performed, or, at least one rolled sheet in the sheet-shaped formed bodies and at least one sheet-shaped formed body comprising polytetrafluoroethylene, high permittivity particles and a forming assistant are superimposed, and rolling is performed.
COPYRIGHT: (C)2010,JPO&INPIT
Takashi Wano
Ryoichi Matsushima
Takayama
Toshio Uoda
Kiyohara Susumu
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Koji Amano