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,
the aromatic dianhydride includes IBIS-BAN (CAS No. 867350-98-9) represented by the following Chemical Formula 2, and
the polyamideimide film has a total light transmittance of 89% or more, and a light transmittance measured at 388 nm of 10% or less, based on a thickness of 55 um:
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 alkoxy group or a C 1 to C 10 alkoxy group, wherein a content of the cycloaliphatic dianhydride is 5 to 30 mol, based on 100 mol of the aromatic diamine,
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 dianhydride further includes 4,4′-hexafluoroisopropylidene diphthalic anhydride.
4. The polyamideimide film of claim 1 , wherein the aromatic diacid dichloride includes terephthaloyl dichloride.
5. 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.
6. The polyamideimide film of claim 1 , wherein a content of the aromatic dianhydride is 10 to 50 mol, based on 100 mol of the aromatic diamine.
7. The polyamideimide film of claim 3 , wherein a content of the aromatic dianhydride is 5 to 25 mol of 4,4′-hexafluoroisopropylidene diphthalic anhydride and 1 to 30 mol of TBIS-BAN (CAS No. 867350-98-9).
8. The polyamideimide film of claim 1 , wherein the polyamideimide film has a modulus of 4.0 GPa or more, as measured at an extension speed of 25 mm/min using UTM 3365 available from Instron.
9. The polyamideimide film of claim 1 , wherein the polyamideimide film has a light transmittance of 2% or less as measured at 388 nm based on a film having a thickness of 55 μm.
10. An image display device comprising the polyamideimide film of claim 1 .