Polyamic acid composition, polyamideimide film thereof and method for preparing polyamideimide film
Provided are a polyamic acid composition, a polyamideimide film thereof, and a method for preparing the polyamideimide film. More specifically, provided are a polyamideimide film capable of implementing excellent optical properties in addition to inherent physical properties of polyimide by using a polyamic acid composition including a combination of specific components, and a method for preparing the polyamideimide film.
1. A polyamideimide film derived from 2,2′-bis(trifluoromethyl)benzidine, cyclic aliphatic dianhydride, and aromatic diacid dichloride, and satisfying Equation 1 below:
( Tr _400 nm/ Tr _550 nm)≥0.96 [Equation 1]
wherein Equation 1 represents a transmittance ratio of a transmittance in a light having a wavelength of 400 nm to a transmittance in a light having a wavelength of 550 nm, Tr_400 nm is a transmittance at 400 nm, and Tr_550 nm is a transmittance at 550 nm,
wherein the polyamide film has a Yellow index of 2.4 or less.
2. The polyamideimide film of claim 1 , wherein the transmittance at 400 nm of the polyamideimide film is 85% or more.
3. The polyamideimide film of claim 1 , wherein the cyclic aliphatic dianhydride is cyclobutane tetracarboxylic dianhydride, and the aromatic diacid dichloride is isophthaloyl dichloride.
4. The polyamideimide film of claim 1 , wherein the aromatic diacid dichloride has a content of 40 to 90 moles with respect to 100 moles of the 2,2′-bis(trifluoromethyl)benzidine.
5. A polyamideimide film derived from components consisting of 2,2′-bis(trifluoromethyl)benzidine, cyclic aliphatic dianhydride, and isophthaloyl dichloride.
6. The polyamideimide film of claim 5 , wherein the isophthaloyl dichloride has a content of 40 to 90 moles with respect to 100 moles of the 2,2′-bis(trifluoromethyl)benzidine.
7. The polyamideimide film of claim 5 , wherein the polyamideimide film satisfies Equation 1 below:
( Tr _400 nm/ Tr _550 nm)≥0.96 [Equation 1]
wherein Equation 1 represents a transmittance ratio of a transmittance in a light having a wavelength of 400 nm to a transmittance in a light having a wavelength of 550 nm, Tr_400 nm is a transmittance at 400 nm, and Tr_550 nm is a transmittance at 550 nm.
8. The polyamideimide film of claim 7 , wherein the transmittance at 400 nm of the polyamideimide film is 85% or more.
9. The polyamideimide film of claim 5 , wherein the polyamideimide film has a Yellow index of 2.4 or less.
10. The polyamideimide film of claim 5 , wherein the cyclic aliphatic dianhydride is cyclobutane tetracarboxylic dianhydride.
11. The polyamideimide film of claim 10 , wherein the isophthaloyl dichloride has a content of 40 to 90 moles with respect to 100 moles of the 2,2′-bis(trifluoromethyl)benzidine.