Polymer film and preparation method thereof
AssigneeSK microworks Co., Ltd.
InventorsJung Hee Ki, Sunhwan Kim, Han Jun Kim, Dae Seong Oh, Jin Woo Lee, Sang Hun Choi, Gun Uk Kim
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Abstract
Embodiments relate to a polymer film that is excellent in folding characteristics and transparency and maintains excellent mechanical properties even after repeated elongation and shrinkage in the elastic region, a process for preparing the same, and a front panel and a display device comprising the same. The polymer film comprises a polymer resin selected from the group consisting of a polyamide-based resin and a polyimide-based resin and has an MOR0/9 of Equation A of 2% or less.
Claims8
A polymer film for a display, which comprises a polymer resin selected from the group consisting of a polyamide-based resin and a polyimide-based resin, and which has an MOR0/9 of the following Equation A of 2% or less, wherein a content of a residual solvent in the polymer film is 2,000 ppm or less:
- MOR
- 0
- /
- 9
- (
- %
- )
- =
- ❘
- "\[LeftBracketingBar]"
- MO
-
- 0
- -
- MO
-
- 9
- ❘
- "\[RightBracketingBar]"
- MO
-
- 9
- ×
- 100
- [
- Equation
-
- A
- ]
- in Equation A, MO0 refers to the initial modulus, and MO9 refers to the modulus measured after elongation and shrinkage are repeated 9 times wherein each elongation is 2%,
- wherein the polymer resin comprises an imide-based repeat unit, an amide-based repeat unit or combinations thereof, with the proviso that a molar ratio of the imide-based repeat unit and the amide-based repeat unit ranges from 0:100 to 35:65,
- wherein the polymer film for a display has a dMO0/9 of the following Equation B of 0.18 GPa or less:
- dMO0/9(GPa)=|MO0−MO9| [Equation B]
- in Equation B, MO0 refers to the initial modulus, and MO9 refers to the modulus measured after elongation and shrinkage are repeated 9 times wherein each elongation is 2%, and
- wherein the polymer film for a display has an IRS of the following Equation C of 100 or less:
- IRS
- =
- IM
- 1
-
- mol
- +
- RS
- 20
-
- ppm
- [
- Equation
-
- C
- ]
- in Equation C, IM stands for the number of moles of the imide-based repeat unit when the total number of moles of the imide-based repeat unit and the amide-based 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.