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US 12,516,164 B2Granted
Polyamide-imide-based film, preparation method thereof, and composite film and display device comprising the same
AssigneesSK microworks Co., Ltd., SK Microworks Solutions Co., Ltd.
InventorsSun Hwan Kim, Dae Seong Oh, Yun-Hee Seo, Jin Woo Lee
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Abstract
The embodiments provide a polyamide-imide-based film that comprises a polyamide-imide-based polymer and has an rSE value of 0.8 to 1.25 as represented by the following Equation 1, whereby it is excellent in adhesion to a hard coating layer and light resistance to a UV light source, a process for preparing the same, and a composite film and a display device comprising the same. <Equation 1> rSE=SE1/SE2 In Equation 1, SE1 is the surface energy (dyne/cm) of a first side of the film, and SE2 is the surface energy (dyne/cm) of a second side of the film.
Claims11
A polyamide-imide-based film, which comprises a polyamide-imide-based polymer and has an rSE value of 0.8 to 1.25 as represented by the following Equation 1,
- rSE=SE1/SE2 <Equation 1>
- in Equation 1, SE1 is the surface energy (dyne/cm) of a first side of the film, and SE2 is the surface energy (dyne/cm) of a second side of the film,
- wherein the polyamide-imide-based film has a dAd value of 13° or less as represented by the following Equation 3,
- dAd=|Ad2−Ad1 <Equation 3>
- in Equation 3, Ad1 is the contact angle (°) of diiodomethane to the first side of the film, and Ad2 is the contact angle (°) of diiodomethane to the second side of the film,
- wherein the polyamide-imide-based film is a film prepared by a process comprising:
- polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound in an organic solvent to prepare a polyamide-imide-based polymer solution;
- casting the solution and then drying it to prepare a gel sheet;
- and
- thermally treating the gel sheet,
- wherein the process comprises, before casting the polyamide-imide-based polymer solution, stirring the solution,
- wherein the step of stirring the solution is carried out at a temperature of 0° C. to 25° C. and at a rotation speed of 120 rpm to 500 rpm,
- wherein the step of preparing a polyamide-imide-based polymer solution comprises adding a filler dispersed in an organic solvent, and the filler has a diameter (D50) of 50 nm to 1,000 nm as dissolved in an organic solvent, and the filler contained in the polyamide-imide-based polymer solution has a diameter (D50) of 500 nm to 3,000 nm after the solution is stirred.
10 more elements
A polyamide-imide-based composite film, which comprises a polyamide-imide-based film and a functional layer, wherein the polyamide-imide-based film comprises a polyamide-imide-based polymer and has an rSE value of 0.8 to 1.25 as represented by the following Equation 1,
- rSE=SE1/SE2 <Equation 1>
- in Equation 1, SE1 is the surface energy (dyne/cm) of a first side of the polyamide-imide-based film, and SE2 is the surface energy (dyne/cm) of a second side of the polyamide-imide-based film,
- wherein the polyamide-imide-based film has a dAd value of 13° or less as represented by the following Equation 3,
- dAd=|Ad2−Ad1| <Equation 3>
- in Equation 3, Ad1 is the contact angle (°) of diiodomethane to the first side of the film, and Ad2 is the contact angle (°) of diiodomethane to the second side of the film,
- wherein the polyamide-imide-based film is a film prepared by a process comprising:
- polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound in an organic solvent to prepare a polyamide-imide-based polymer solution;
- casting the solution and then drying it to prepare a gel sheet;
- and
- thermally treating the gel sheet,
- wherein the process comprises, before casting the polyamide-imide-based polymer solution, stirring the solution,
- wherein the step of stirring the solution is carried out at a temperature of 0° C. to 25° C. and at a rotation speed of 120 rpm to 500 rpm,
- wherein the step of preparing a polyamide-imide-based polymer solution comprises adding a filler dispersed in an organic solvent, and the filler has a diameter (D50) of 50 nm to 1,000 nm as dissolved in an organic solvent, and the filler contained in the polyamide-imide-based polymer solution has a diameter (D50) of 500 nm to 3,000 nm after the solution is stirred.
10 more elements
A display device, which comprises a display unit;
- and a cover window disposed on the display unit, wherein the cover window comprises a polyamide-imide-based film and a functional layer, and the polyamide-imide-based film comprises a polyamide-imide-based polymer and has an rSE value of 0.8 to 1.25 as represented by the following Equation 1:
- rSE=SE1/SE2 <Equation 1>
- in Equation 1, SE1 is the surface energy (dyne/cm) of a first side of the polyamide-imide-based film, and SE2 is the surface energy (dyne/cm) of a second side of the polyamide-imide-based film,
- wherein the polyamide-imide-based film has a dAd value of 13° or less as represented by the following Equation 3,
- dAd=|Ad2−Ad1| <Equation 3>
- in Equation 3, Ad1 is the contact angle (°) of diiodomethane to the first side of the film, and Ad2 is the contact angle (°) of diiodomethane to the second side of the film,
- wherein the polyamide-imide-based film is a film prepared by a process comprising:
- polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound in an organic solvent to prepare a polyamide-imide-based polymer solution;
- casting the solution and then drying it to prepare a gel sheet;
- and
- thermally treating the gel sheet,
- wherein the process comprises, before casting the polyamide-imide-based polymer solution, stirring the solution,
- wherein the step of stirring the solution is carried out at a temperature of 0° C. to 25° C. and at a rotation speed of 120 rpm to 500 rpm,
- wherein the step of preparing a polyamide-imide-based polymer solution comprises adding a filler dispersed in an organic solvent, and the filler has a diameter (D50) of 50 nm to 1,000 nm as dissolved in an organic solvent, and the filler contained in the polyamide-imide-based polymer solution has a diameter (D50) of 500 nm to 3,000 nm after the solution is stirred.
11 more elements
Dependencies are inferred from the claim text.