Polyamic acid resin and polyamideimide film
Provided are a polyamic acid resin derived from an aromatic diamine, an aromatic dianhydride, a cycloaliphatic dianhydride and an aromatic diacid dichloride, and a polyamideimide film including polyamideimide derived from an aromatic diamine, an aromatic dianhydride, a cycloaliphatic dianhydride and an aromatic diacid dichloride.
1. A polyamideimide film comprising polyamideimide derived from an aromatic diamine, an aromatic dianhydride, a cycloaliphatic dianhydride and an aromatic diacid dichloride, wherein
the cycloaliphatic dianhydride includes a compound represented by the following Chemical Formula 1,
wherein a content of the aromatic dianhydride is 5 to 25 mol of 4,4′-hexafluoroisopropylidene diphthalic anhydride and 5 to 25 mol of biphenyltetracarboxylic dianhydride, based on 100 mol of the aromatic diamine, and
the polyamideimide film has a total light transmittance of 88% or more, and a light transmittance measured at 388 nm of 40% or less:
wherein
R 1 to R 4 are independently of one another, selected from the group consisting of hydrogen, halogen, a C 1 to C 10 alkyl group or a C 1 to C 10 alkoxy group.
2. The polyamideimide film of claim 1 , wherein the aromatic diamine includes 2,2′-bis(trifluoromethyl)-benzidine.
3. The polyamideimide film of claim 1 , wherein the aromatic diacid dichloride includes terephthaloyl dichloride.
4. The polyamideimide film of claim 1 , wherein a content of the aromatic diacid dichloride is more than 50 mol, based on 100 mol of the aromatic diamine.
5. The polyamideimide film of claim 1 , wherein a content of the cycloaliphatic dianhydride is 5 to 30 mol, based on 100 mol of the aromatic diamine.
6. The polyamideimide film of claim 1 , wherein the polyamideimide film has a modulus of 5.0 GPa or more, as measured at an extension speed of 25 mm/min using UTM 3365 available from Instron.
7. The polyamideimide film of claim 1 , wherein the polyamideimide film has a yellow index of 3.0 or less, as measured in accordance with the ASTM E313 standard.
8. The polyamideimide film of claim 6 , wherein the polyamideimide film has a modulus of 5.0 GPa or more, as measured at an extension speed of 25 mm/min using UTM 3365 available from Instron, for a specimen having a thickness of 55 μm, a length of 50 mm and a width of 10 mm.
9. The polyamideimide film of claim 1 , wherein the polyamideimide film has a total light transmittance of 88% or more, based on a thickness of 55 μm.
10. The polyamideimide film of claim 7 , wherein the polyamideimide film has a yellow index of 3.0 or less, as measured in accordance with the ASTM E313 standard, based on a thickness of 55 μm.
11. The polyamideimide film of claim 1 , wherein the polyamideimide film has a light transmittance measured at 388 nm of 40% or less, based on a thickness of 55 μm.
12. An image display device comprising the polyamideimide film of claim 1 .