FILM, MULTILAYER ELECTRONIC DEVICE, AND MANUFACTURING METHOD OF THE FILM
The present disclosure discloses a film including a polyimide layer including an aromatic diamine compound residue and an aromatic dianhydride compound residue, wherein the polyimide layer has a loop stiffness value of 3 to 4.5 m/N based on a thickness of the polyimide layer of 50 μm.
1 . A film comprising a polyimide layer comprising an aromatic diamine compound residue and an aromatic dianhydride compound residue, wherein the polyimide layer has a loop stiffness value of 3 to 4.5 m/N based on a thickness of the polyimide layer of 50 μm.
2 . The film of claim 1 , wherein the polyimide layer has a heat resistance stability index (HS index) of 5 to 15° C. 2 /ppm·MPa according to Equation 1 below:
HS
index
=
Tg
×
10
H
×
RS
[
Equation
1
]
wherein, in Equation 1, HS index is a heat resistance stability index (° C. 2 /ppm·MPa), Tg is a glass transition temperature (° C.),H is a coefficient of a thermal expansion value (ppm/° C.) of the polyimide layer, and RS is a residual stress value (MPa) of the polyimide layer.
3 . The film of claim 1 , wherein the polyimide layer has an adhesion force of 200 gf/inch or more.
4 . The film of claim 1 , wherein the polyimide layer has a yellow index of 5.3 or less.
5 . The film of claim 1 , wherein the polyimide layer has a composite index of 2° C. 2 /ppm or more expressed by Equation 2 below:
T
Index
=
Tg
H
×
Y
1
[
Equation
2
]
wherein, in Equation 2, T Index is a composite index, Tg is a glass transition temperature (° C.), YI is a yellow index in a thickness of 10 μm of the polyimide layer, and H is a coefficient of thermal expansion (ppm/° C.) value of the polyimide layer.
6 . The film of claim 1 , wherein the polyimide layer comprises a biphenyltetracarboxylic acid dianhydride residue of 5 to 45 mol, when a total amount of the aromatic dianhydride compound residue is 100 mol.
7 . The film of claim 1 , wherein the polyimide layer comprises a biphenyltetracarboxylic acid dianhydride residue and a pyromellitic dianhydride residue.
8 . The film of claim 7 , wherein an amount of the biphenyltetracarboxylic acid dianhydride residue is 15 to 50 mol % based on a sum of numbers of moles of the biphenyltetracarboxylic acid dianhydride residue and pyromellitic dianhydride residue.
9 . The film of claim 7 , wherein an amount of the pyromellitic dianhydride residue is less than 60 mol % when an amount of the aromatic dianhydride compound residue is 100 mol.
10 . A multilayer electronic device comprising a substrate layer and a radiant functional layer, wherein the substrate layer comprises the film of claim 1 .
11 . A method of manufacturing a film comprising:
preparing a polymer solution by stirring a raw material composition including an aromatic diamine compound and an aromatic dianhydride compound to prepare the polymer solution with a viscosity of 1,000 to 8,000 cps measured at 25° C.;
preparing a sheet by applying the polymer solution in a sheet form and drying the polymer solution with a hot wind to prepare the sheet; and
preparing the film by thermally treating the sheet, wherein the polyimide layer comprises an aromatic diamine compound residue and an aromatic dianhydride compound residue, and
wherein the polyimide layer has a loop stiffness value of 3 to 4.5 m/N based on a thickness of the polyimide layer of 50 μm.
12 . The method of claim 11 , wherein the film is thermally treated at a temperature of at 360 to 480° C.
13 . The method of claim 11 , wherein the stirring comprises a primary stirring, a secondary stirring, and a tertiary stirring.
14 . The method of claim 13 , wherein the primary stirring comprises stirring the aromatic diamine compound and a first aromatic dianhydride compound, and wherein the aromatic diamine compound and the first aromatic dianhydride compound are represented by the following Formula 1 and 2-1, respectively:
15 . The method of claim 14 , wherein the primary stirring is performed for a reaction time of 1 hour to 7 hours at a reaction temperature of 5 to 15° C.
16 . The method of claim 14 , wherein the secondary stirring comprises stirring a reaction product of the primary stirring and a second aromatic dianhydride compound, wherein the second aromatic dianhydride compound is represented by the following Formula 2-2:
17 . The method of claim 16 , wherein the secondary stirring is performed for a reaction time of 30 minutes to 10 hours at a reaction temperature of 30 to 70° C.
18 . The method of claim 16 , wherein the tertiary stirring comprises stirring a reaction product of the secondary stirring and a third aromatic dianhydride compound, wherein the third aromatic dianhydride compound is represented by the following Formula 2-3:
19 . The method of claim 18 , wherein the tertiary stirring is performed for a reaction time of 30 minutes to 10 hours at a reaction temperature of 30 to 70° C.
20 . The method of claim 11 , wherein the raw material composition or the polymer solution further comprises a leveling stabilizer.