POLYAMIC ACID COMPOSITION, POLYIMIDE FILM AND SUBSTRATEUSED FOR DISPLAY DEVICE USING THE SAME

摘要

PURPOSE: A polyamic acid composition is provided to have a low viscosity while maintaining a high molecular weight and to manufacture a polyimide film with excellent quality when smoothly spread on a support. CONSTITUTION: A polyamic acid composition is polymerized of a di and/or triamine compound, in which an aromatic diamine and triamine with three amine groups are mixed with a molar ratio of 70:30-99:1, and an aromatic anhydride. In the aromatic anhydride, two different aromatic dianhydrides with three anhydride groups are mixed with a molar ratio of 10:90-50:50. The molecular weight of the polyamic acid composition is 90,000-120,000 Mw, and the viscosity is 10,000-20,000 Cp. A polyimide film is manufactured by using the polyamic acid composition.