LENGTHY POLYIMIDE FILM, POLYIMIDE FILM ROLL AND PROCESS FOR PRODUCING THEM

WIPO Patent Application WO/2006/098044

A1

A lengthy polyimide film is obtained by sequentially performing casting of an organic solvent solution of polyimide precursor substance onto a support to thereby form a film, hot drying of the film so that the difference between imide conversion ratio IM_A of the precursor film on one major surface side (A-surface side) and imide conversion ratio IM_B on the other major surface side (B-surface side) is ≤ 5 and heat treatment of the resultant precursor film. A polyimide film roll is obtained by rolling up the resultant film with the A-surface side inside with a rolling tension of ≥ 100 N so as to attain a radius of curvature ranging from 30 to 600 mm. Both the obtained lengthy polyimide film and polyimide film roll exhibit a curling degree after heating at 300°C of ≤ 10% and a coefficient of variation of film linear expansion coefficient (CV%) of ≤ 25%.

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TSUTSUMI MASAYUKI (JP)
OYAMA HIROKO (JP)
MAEDA SATOSHI (JP)
KAWAHARA KEIZO (JP)

PCT/JP2005/012627

September 21, 2006

July 01, 2005

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TOYO BOSEKI (JP)
TSUTSUMI MASAYUKI (JP)
OYAMA HIROKO (JP)
MAEDA SATOSHI (JP)
KAWAHARA KEIZO (JP)

C08J5/18; C08L79/08

JP2005064030A	2005-03-10
JP2000085007A	2000-03-28
JPH1077353A	1998-03-24
JPS61111359A	1986-05-29
JP2003206353A	2003-07-22
JP2004068002A	2004-03-04

Takashima, Hajime (1-1 Fushimimachi 4-chome, Chuo-k, Osaka-shi Osaka, JP)

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