Ultra-thin polyimide film and composition for manufacturing the same

Abstract

This invention discloses a polyimide membrane comprising a polyimide having dianhydride monomers and diamine monomers as polymerization units, satisfying Equation 1 below, and having a thickness of 1 μm to 5 μm. [Equation 1] |LMD-LTD|<0.02 mN / cm In Equation 1, LMD is the ring stiffness value of the membrane in the machine direction, LTD is the ring stiffness value of the membrane in the transverse direction, and the ring stiffness value is measured by bending the membrane into a ring using a ring stiffness tester and measuring the stress when compressed in the diameter direction of the ring, under the conditions of a sample width of 10 mm, a ring length of 50 mm, and a compression distance of 10 mm.