Base film, preparation method thereof, and cover window and display device comprising same
AssigneeSK microworks Co., Ltd.
InventorsSunhwan Kim, Jung Hee Ki, Han Jun Kim, Dae Seong Oh, Jin Woo Lee, Sang Hun Choi
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Abstract
Embodiments relate to a base film that is colorless, transparent, and excellent in mechanical properties and optical properties, particularly with low moisture permeability, a process for preparing the same, and a cover window and a display device comprising the same. The cover window comprises a base film comprising a polyamide-based polymer and having a moisture permeability of 300 g/m2·day or less; and a functional layer.
Claims8
A cover window for a display device, which comprises a base film comprising a polyamide-based polymer and having a moisture permeability of 30 g/m2·day to 300 g/m2·day measured in the thickness direction according to ASTM F 372;
- and a functional layer,
- wherein the polyamide-based polymer is formed by polymerizing a diamine compound, a dicarbonyl compound, and optionally a dianhydride compound, and the molar ratio of the dianhydride compound and the dicarbonyl compound is 0:100 to 25:75,
- wherein a thickness of the base film is 20 μm to 150 μm,
- wherein a content of a residual solvent in the base film is 1,000 ppm or less,
- wherein the base film has a modulus of 6.5 GPa or more,
- wherein the base film has a yellow index of 3 or less, a transmittance at 550nm of 88% or more, a haze at 550 nm of 1% or less, and
- wherein the IS value represented by the following Equation 1 is 10 to 100:
- IS
-
- =
- IM
- +
- R
-
- S
- 1
-
- 0
- [
- Equation
-
- 1
- ]
- wherein, in Equation 1, IM stands for the number of moles of the imide repeat unit when the total number of moles of the imide repeat unit and the amide repeat unit in the film is 100;
- and RS stands for the content (ppm) of the residual solvent in the film.
A base film for a display device, which comprises a polyamide-based polymer and has a moisture permeability of 30 g/m2·day to 300 g/m2·day measured in the thickness direction according to ASTM F 372,
- wherein the polyamide-based polymer is formed by polymerizing a diamine compound, a dicarbonyl compound, and optionally a dianhydride compound, and the molar ratio of the dianhydride compound and the dicarbonyl compound is 0:100 to 25:75,
- wherein a thickness of the base film is 20 μm to 150 μμm,
- wherein a content of a residual solvent in the base film is 1,000 ppm or less,
- wherein the base film has a modulus of 6.5 GPa or more,
- wherein the base film has a yellow index of 3 or less, a transmittance at 550 nm of 88% or more, a haze at 550 nm of 1% or less, and
- wherein the IS value represented by the following Equation 1 is 10 to 100:
- IS
-
- =
- I
-
- M
- +
- R
-
- S
- 1
-
- 0
- [
- Equation
-
- 1
- ]
- wherein, in Equation 1, IM stands for the number of moles of the imide repeat unit when the total number of moles of the imide repeat unit and the amide repeat unit in the film is 100;
- and RS stands for the content (ppm) of the residual solvent in the film.
A display device, which comprises a display panel;
- and a cover window disposed on the display panel,
- wherein the cover window comprises a base film and a functional layer,
- wherein the base film comprises a polyamide-based polymer and has a moisture permeability of 30 g/m2·day to 300 g/m2·day measured in the thickness direction according to ASTM F 372,
- wherein the polyamide-based polymer is formed by polymerizing a diamine compound, a dicarbonyl compound, and optionally a dianhydride compound, and the molar ratio of the dianhydride compound and the dicarbonyl compound is 0:100 to 25:75,
- wherein a thickness of the base film is 20 μm to 150 μm,
- wherein a content of a residual solvent in the base film is 1,000 ppm or less,
- wherein the base film has a modulus of 6.5 GPa or more,
- wherein the base film has a yellow index of 3 or less, a transmittance at 550 nm of 88% or more, a haze at 550 nm of 1% or less, and
- wherein the IS value represented by the following Equation 1 is 10 to 100:
- IS
-
- =
- I
-
- M
- +
- R
-
- S
- 1
-
- 0
- [
- Equation
-
- 1
- ]
- wherein, in Equation 1, IM stands for the number of moles of the imide repeat unit when the total number of moles of the imide repeat unit and the amide repeat unit in the film is 100;
- and RS stands for the content (ppm) of the residual solvent in the film.
Dependencies are inferred from the claim text.