Patent ID: 11898009
Assignee: UBE CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  H  G  Y | IPC C  G  H

Claim 0:
1. A polyimide film-based flexible electronic device substrate formed from a polyimide that does not comprise a compound including a Si-containing group, wherein the polyimide has a maximum gradient of 0.005/V or more in a capacitance-voltage measurement of a laminate in which a polyimide film having a film thickness of 0.75 μm is formed on a silicon wafer having a resistance value of 4 Ωcm; wherein the maximum gradient is a maximum value of an absolute value of a gradient in a normalized capacity-voltage curve during a third scan of forward direction scans; wherein a capacity-voltage curve is measured by applying a direct current voltage to the polyimide film with respect to the silicon wafer between a lowest voltage V1 and a highest voltage V2, and measuring capacitance while the direct current voltage is scanned in a forward direction from the lowest voltage V1 to the highest voltage V2 and scanned in a negative direction from the highest voltage V2 to the lowest voltage V1; where the lowest voltage V1 is a voltage at which the capacity of only the polyimide film is observed, and the normalized capacity-voltage curve is normalized so that the capacity at the lowest voltage V1 is 1.