Polyimide film and preparation process of the film

Details Polyimide film and preparation process of the film Polyimide film and preparation process of the film

B - Operations, Transporting

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B29C 55/12 (2006.01) B29C 55/00 (2006.01) B29C 67/24 (2006.01) C08G 73/10 (2006.01) C08J 5/18 (2006.01) H05K 1/03 (2006.01) H05K 3/00 (2006.01)

Patent

CA 2021293

ABSTRACT A polyimide film essentially consisting of polyimide having recurring units of the formula ( I ): Image ( I ) which has a density of 1.335 to 1.390 g/cm at 23 °C and/or a refractive index of 1.605 to 1.650 at 23 °C in the direction of thickness and is transparent; and a preparation process of the polyimide film by extruding the polylmide having recurring units of the above formula ( I ) throught a common melt-extrusion process, casting an a chill-roller to obtain an unstratched film, uniaxially or biaxially stretching the unstretched film to cause molecular orientation, and successively setting the stretched film through heat- treatment; are disclosed.

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