Polyimide film, process for preparing the same and

专利名称：Polyimide film, process for preparing the

same and controlling isotropy of the same

发明人：Hidehito Nishimura,Kazuhiro Ono,Masaru

Nishinaka,Kiyokazu Akahori

申请号：US11357275申请日：20060217

公开号：US20060138707A1公开日：20060629

专利附图：

摘要：To provide a polyimide film having an original film width of at least 500 mm,whose isotropy in a width direction is improved to have uniform properties, which

polyimide film has been apt to cause property difference in the width direction bycontinuous molding. The polyimide film has an original film width of at least 500 mm anda thickness of at most 50 μm, wherein the maximum value of MOR-c is at most 1.35 and atensile elastic modulus is at least 5.0 GPa at any part of the film. The polyimide film isprepared by the method which comprises steps of: forming a green sheet containing avolatile component, and heating the green sheet by transferring the same through afurnace with both ends of the green sheet being fixed, wherein at the heating step, theoriginal film has an orientation axis angle θ of a positive value at both ends in the originalfilm width direction, and temperature is lower than the boiling point of a main volatilecomponent in a zone where the original film is transferred for a distance equal to the filmwidth between both fixed ends.

申请人：Hidehito Nishimura,Kazuhiro Ono,Masaru Nishinaka,Kiyokazu Akahori

地址：Otsu-shi JP,Otsu-shi JP,Otsu-shi JP,Otsu-shi JP

国籍：JP,JP,JP,JP

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