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CN-121975115-A - Polyamide-imide-based film, method for preparing the same, window cover plate and display device comprising the same

CN121975115ACN 121975115 ACN121975115 ACN 121975115ACN-121975115-A

Abstract

The present invention relates to a polyamide-imide based film, a method for preparing the same, and a window cover plate and a display device including the same. A polyamide-imide-based film comprising a polyamide-imide-based polymer containing no fluorine atom and having a modulus of 5GPa or more based on a film thickness of 50 μm, thereby being excellent in optical characteristics, mechanical characteristics, ultraviolet blocking rate.

Inventors

  • LI CHENYU
  • LI ZHENLONG
  • XU YUNXI
  • Zheng Duoyu
  • SONG JIYUN

Assignees

  • 迈克沃解决方案有限公司

Dates

Publication Date
20260505
Application Date
20251021
Priority Date
20241025

Claims (10)

  1. 1. A polyamide-imide based film comprising a polyamide-imide based polymer containing no fluorine atoms, wherein the polyamide-imide based film has a modulus of 5GPa or more based on a film thickness of 50 μm.
  2. 2. The polyamide-imide based film of claim 1, having a transmittance of 3% or less at a wavelength of 380nm, based on a film thickness of 50 μm.
  3. 3. The polyamide-imide based film of claim 1, which has a total light transmittance of 80% or more, a haze of 1% or less, and a yellowness index of 5 or less measured in the visible wavelength range, based on a film thickness of 50 μm.
  4. 4. The polyamide-imide based film as claimed in claim 1, wherein the polyamide-imide based polymer is a polymer of a diamine compound, a dianhydride compound, and a dicarbonyl compound, The diamine compound is represented by the following formula 1, The dianhydride compound is represented by the following formula 2, and The dicarbonyl compound is represented by the following formula 3: [ 1] ; [ 2] ; [ 3] ; In the above formulae 1 to 3, E and J are each independently selected from the group consisting of a substituted or unsubstituted divalent C 6 -C 30 aliphatic cyclic group, a substituted or unsubstituted divalent C 4 -C 30 heteroaliphatic cyclic group, a substituted or unsubstituted divalent C 6 -C 30 aromatic cyclic group, a substituted or unsubstituted divalent C 4 -C 30 heteroaromatic cyclic group, a substituted or unsubstituted C 1 -C 30 alkylene group, a substituted or unsubstituted C 2 -C 30 alkenylene group, a substituted or unsubstituted C 2 -C 30 alkynylene group, -O-, -S-, -C (=O) -, -CH (OH) -, -S (=O) 2 -、-Si(CH 3 ) 2 -, and-C (CH 3 ) 2 -, E and j are each independently selected from integers from 1 to 5, When E is 2 or more, two or more E are the same or different from each other, When J is 2 or more, two or more J are the same or different from each other, G is a group selected from a substituted or unsubstituted tetravalent C 4 -C 30 aliphatic cyclic group, a substituted or unsubstituted tetravalent C 4 -C 30 heteroaliphatic cyclic group, a substituted or unsubstituted tetravalent C 6 -C 30 aromatic cyclic group, or a substituted or unsubstituted tetravalent C 4 -C 30 heteroaromatic cyclic group, wherein the aliphatic cyclic group, heteroaliphatic cyclic group, aromatic cyclic group, or heteroaromatic cyclic group are present alone, fused to one another to form a fused ring, or bonded through a bonding group selected from a substituted or unsubstituted C 1 -C 30 alkylene group, a substituted or unsubstituted C 2 -C 30 alkenylene group, a substituted or unsubstituted C 2 -C 30 alkynylene group, -O-, -S-, -C (=O) -, -CH (OH) -, -S (=O) 2 -、-Si(CH 3 ) 2 -、-C(CH 3 ) 2 -, and X is a halogen atom.
  5. 5. The polyamide-imide based film of claim 4, wherein the diamine compound comprises 2,2' -dimethylbenzidine (m-tolidine).
  6. 6. The polyamide-imide based film of claim 4, wherein the dianhydride compound comprises 1,2,3, 4-cyclobutane tetracarboxylic dianhydride (CBDA).
  7. 7. The polyamide-imide based film of claim 1 having a pencil hardness of HB or higher.
  8. 8. A window cover for a display device comprising a polyamide-imide based film and a functional layer, wherein the polyamide-imide based film comprises a polyamide-imide based polymer containing no fluorine atoms, and the polyamide-imide based film has a modulus of 5GPa or more based on a film thickness of 50 μm.
  9. 9. A display device comprises a display unit and a window cover plate arranged on the display unit, Wherein the window cover comprises a polyamide-imide based film and a functional layer, and Wherein the polyamide-imide based film comprises a polyamide-imide based polymer containing no fluorine atoms, and the polyamide-imide based film has a modulus of 5GPa or more based on a film thickness of 50 μm.
  10. 10. A method of making the polyamide-imide film of claim 1, 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 to prepare a gel sheet; The gel sheet is heat treated.

Description

Polyamide-imide-based film, method for preparing the same, window cover plate and display device comprising the same Technical Field Embodiments relate to a polyamide-imide based film, a method of preparing the same, and a window cover (cover window) and a display device including the same. Background Polyimide-based resins such as polyamide-imide (PAI) have excellent abrasion resistance, heat resistance, chemical resistance. Therefore, they are applied to applications such as primary electric insulating materials, paints, adhesives, resins for extrusion, heat-resistant paints, heat-resistant plates, heat-resistant adhesives, heat-resistant fibers, and heat-resistant films. Polyimide has a very wide application field. For example, polyimide is made in powder form and can be used as a coating for metal or magnet wires. Depending on the application, the polyimide is mixed with other additives. Polyimide is also used for coating kitchen tools, as a membrane for separating gas by virtue of its heat resistance and chemical resistance, and in addition, polyimide is also used for natural gas wells for filtering contaminants such as carbon dioxide, hydrogen sulfide and impurities. In recent years, polyimide films have been developed which are low in cost and have excellent optical, mechanical and thermal properties. Such polyimide-based films are applicable to display materials such as Organic Light Emitting Diodes (OLEDs) or Liquid Crystal Displays (LCDs), etc., as well as to antireflection films, compensation films, and retardation films (if desired to achieve retardation performance). However, the conventional polyimide-based film, particularly the conventional polyamide-imide-based film, has a problem in that the polyamide-imide-based polymer necessarily contains fluorine atoms, which may be restricted by environmental regulations. Accordingly, there is an increasing need to develop polyamide-imide-based films prepared from fluorine-free polyamide-imide-based polymers that have excellent optical and mechanical properties. Disclosure of Invention Embodiments relate to providing a polyamide-imide based film having excellent optical and mechanical properties, a method of preparing the same, and a window cover plate and a display device including the same. The polyamide-imide-based film according to one embodiment comprises a polyamide-imide-based polymer containing no fluorine atoms, wherein the polyamide-imide-based film has a modulus of 5GPa or more based on a film thickness of 50 μm. A window cover for a display device according to another embodiment includes a polyamide-imide based film and a functional layer, wherein the polyamide-imide based film includes a polyamide-imide based polymer containing no fluorine atom, and the polyamide-imide based film has a modulus of 5GPa or more based on a film thickness of 50 μm. The display device according to another embodiment includes a display unit, and a window cover provided on the display unit, wherein the window cover includes a polyamide-imide based film including a polyamide-imide based polymer containing no fluorine atom and a functional layer, and the polyamide-imide based film has a modulus of 5GPa or more (based on a film thickness of 50 μm). A method of preparing a polyamide-imide-based film according to one embodiment includes 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 drying to prepare a gel sheet, and heat-treating the gel sheet. The polyamide-imide based film according to one embodiment has excellent optical and mechanical properties even though the polyamide-imide based polymer does not contain fluorine atoms. In addition, the polyamide-imide-based film according to one embodiment does not contain fluorine atoms, and can easily meet environmental regulations. Further, the polyamide-imide based film according to one embodiment has excellent ultraviolet blocking rate, and thus can prevent deterioration or damage due to ultraviolet rays when applied to a display device, so that the display device can maintain stable performance even after long-term use. Drawings Fig. 1 is a schematic exploded view of a display device according to one embodiment. Fig. 2 is a schematic perspective view of a display device according to one embodiment. Fig. 3 is a schematic cross-sectional view of a display device according to one embodiment. Fig. 4 is a schematic flow chart of a method of preparing a polyamide-imide based film, according to one embodiment. Detailed description of the preferred embodiments The embodiments will be described in detail below with reference to the drawings so that those skilled in the art to which the present invention pertains can easily implement the embodiments. However, these embodiments may be implemented in a number of different ways and are not limited to the embodiments herein. Throughout the specifica