| abstract |
The invention discloses a polyimide film, a polyimide composition and a display screen element. The polyimide film includes the polyimide represented by the chemical formula 2 or the polyamide-imide copolymer represented by the chemical formula 1, and the energy margin of the lift-off laser is more than 30 mj/cm 2 . In Chemical Formula 1, the ratio of n:m is 11:89 to 39:61, X is a tetravalent group having an aromatic ring structure, Y is a divalent group having an aromatic ring structure, and Z is a group having an aromatic ring structure A divalent group with an aliphatic ring or aliphatic ring structure, in Chemical formula 2, the ratio of n:m is 21:79 to 94:6, X1 is a tetravalent group with an aromatic ring structure, and Y1 is a tetravalent group with an aromatic ring structure A divalent group having a ring structure, and Z1 is a tetravalent group having an aliphatic ring structure. |