| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyimide film excellent in dynamic properties and heat resistance, and having preferable lubricant impregnancy; production method thereof, and further a polyimide coating composition obtained by impregnating the film with lubricant.SOLUTION: There is disclosed a porous polyimide film formed on the surface of a substrate, where the porous polyimide has all the following characteristics (1) to (3): (1) Tg (glass transition temperature) of the polyimide is 200°C or higher; (2) the porosity of the polyimide coat is 30-80%; and (3) the liquid impregnating rate measured by the method described in the specification is 25 min or shorter. |
