Patent ID: 7247367

Claim:
A polyimide film, which uses a soluble polyimide resin obtained by diamine constituent and acid dianhydride constituent, wherein the diamine constituent is a compound denoted by a following chemical formula (1), wherein the acid dianhydride constituent is denoted by a following chemical formula (2), H 2 N—A—R—B—R—A—NH 2 (1) A. A SINGLE BOND OR A BIVALENT HYDROCARBON GROUP HAVING 1 TO 3 CARBON ATOMS OR A SINGLE BOND A SINGLE BOND OR A BIVALENT HYDROCARBON GROUP HAVING 1 TO 10 CARBON ATOMS THE Zs ARE INDEPENDENT IN THE FORMULA. OR DENOTES A SINGLE BOND, Y DENOTES, OR DENOTES A SINGLE BOND (n IS IN A RANGE FROM 1 TO 10) wherein the polyimide film has a transparency of not less than 70% with respect to light with a wavelength of 440 nm and has a tearing strength of not less than 2N/mm when it is 75 μm thick.