Abstract

The embodiments aim to provide a polyamide-imide-based film that has a TGA weight loss area value (TDA) of 0.01%·min/° C. or less and is excellent in mechanical properties, optical properties, and the suitability for post-processing, a process for preparing the same, and a cover window and a display device comprising the same.

IPC Classes  ?

• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08G 73/14 - Polyamide-imides

Abstract

nn is yellow index measured after the protective layer is irradiated with UVB-313 EL light for n hours at an output of 0.68 W/m2maxminmax0244872144216312384min0244872144216312384384. The film can exhibit excellent yellowing resistance and mechanical properties even when exposed to ultraviolet rays for a long period of time.

IPC Classes  ?

• C08J 7/04 - Coating
• C08J 5/18 - Manufacture of films or sheets
• C08L 77/00 - Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chainCompositions of derivatives of such polymers
• C08L 71/00 - Compositions of polyethers obtained by reactions forming an ether link in the main chainCompositions of derivatives of such polymers
• C08K 5/134 - Phenols containing ester groups
• C08K 5/132 - Phenols containing keto groups
• C08K 5/3475 - Five-membered rings condensed with carbocyclic rings
• C08K 5/3492 - Triazines
• C09J 7/25 - PlasticsMetallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds

Abstract

The embodiments aim to provide a polyamide-imide-based film, which comprises an alcohol-based supplement therein and is excellent in mechanical properties, optical properties, and suitability for post-processing. Further, the embodiments aim to provide a process for preparing the polyamide-imide-based film, and a cover window and a display device comprising the polyamide-imide-based film.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08K 5/05 - AlcoholsMetal alcoholates

Abstract

A multilayer sheet according to an embodiment comprises an elastic layer and an adhesive layer disposed on the elastic layer. The multilayer sheet has a storage modulus measured at 20°C of 10 MPa or more and 1000 MPa or less. The multilayer sheet has characteristics of suppressing peeling from an attachment target surface even after repeated bending or rolling over a wide temperature range, preventing occurrence of separation between layers, and being resistant to external impact.

IPC Classes  ?

• C09J 7/22 - PlasticsMetallised plastics
• G09F 9/30 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Abstract

The embodiments relate to a polyamide-based film that is excellent in solvent resistance and optical properties, to a process for preparing the same, and to a cover window and a display device comprising the same. The polyamide-based film comprises a polyamide-based polymer, wherein when the 3D surface roughness of a first side of the film is measured, the volume (natural volume) between the surface and a reference plane placed at the elevation of the highest peak parallel to the surface plane is 100 μm3 to 2,800 μm3.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08G 69/42 - Polyamides containing atoms other than carbon, hydrogen, oxygen, and nitrogen
• C08K 7/18 - Solid spheres inorganic

Abstract

Embodiments relate to a polyamide-based film, a manufacturing method therefor, and a cover window and a display device each comprising same, wherein the polyamide-based film has excellent optical characteristics, such as transmittance, haze, and yellowness, and excellent mechanical characteristics, such as modulus and thickness uniformity. The polyamide-based film contains a polyamide-based polymer and includes a sum XRD peak obtained by adding up a first XRD peak having the maximum value in the section where the 2θ value is 10° (inclusive) to 20° (exclusive) and a second XRD peak having the maximum value in the section where the 2θ value is 20° to 25°, on the XRD graph, wherein the full width at half maximum of the first XRD peak is 6° or less.

IPC Classes  ?

• C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
• C08J 5/18 - Manufacture of films or sheets

Abstract

An optical sheet according to an embodiment comprises a UV-curable prism pattern layer into which a specific organic dye is introduced, and thus the optical sheet shows very little change in color absorption even after being irradiated with a high amount of UV light. Therefore, the optical sheet can have improved optical/mechanical properties by an increasing degree of curing and can maintain a property of selectively absorbing light in a specific wavelength band even in an actual use environment after being applied to a product.

IPC Classes  ?

• G02B 5/00 - Optical elements other than lenses
• G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
• G02B 5/04 - Prisms
• G02B 5/20 - Filters
• G02F 1/1335 - Structural association of cells with optical devices, e.g. polarisers or reflectors

Abstract

In the multilayer film provided with a primer layer of a specific composition comprising a polyester-based resin on a polyamide-based base layer, the adhesive strength with a hard coating layer and an OCA layer to be coated on the surface thereof is excellent, as well as the optical and mechanical properties are also excellent.

IPC Classes  ?

• C08J 7/043 - Improving the adhesiveness of the coatings per se, e.g. forming primers
• C09D 175/04 - Polyurethanes
• C09D 167/00 - Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chainCoating compositions based on derivatives of such polymers

Abstract

In the composite film according to the embodiment, an elastic layer in which its modulus change characteristics with respect to temperature have been adjusted to a certain range is coated onto the opposite side to a hard coating layer; thus, it is possible to enhance the surface hardness and elastic recovery characteristics of the hard coating layer. Thus, it can be advantageously applied as a cover window of a flexible display device.

IPC Classes  ?

• C08J 7/04 - Coating
• C08J 7/044 - Forming conductive coatingsForming coatings having anti-static properties
• G02B 1/14 - Protective coatings, e.g. hard coatings
• G06F 1/16 - Constructional details or arrangements

Abstract

The embodiments aim to provide a polyamide-imide-based film, which has a content of nitrogen (N) elements in the film of 6 to 7.5% by weight based on the sum of the weights of carbon (C), hydrogen (H), oxygen (O), and nitrogen (N) elements in the film, whereby it is uniform in quality and excellent in mechanical properties and optical properties, a process for preparing the same, and a cover window and a display device comprising the same.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08J 5/18 - Manufacture of films or sheets

Abstract

The embodiments provide a polyamide-imide-based film that comprises a polyamide-imide-based polymer and has an RC value of 0.96 to 1.03 as represented by the following Equation 1, whereby it is uniform in quality and excellent in mechanical properties and optical properties, a process for preparing the same, and a cover window and a display device comprising the same. RC=CTEMD/CTETD In Equation 1, CTEMD is an average value of the coefficients of thermal expansion (ppm/° C.) in the MD direction of the film, CTETD is an average value of the coefficients of thermal expansion (ppm/° C.) in the TD direction of the film, and the average value is an average of the coefficients of thermal expansion measured at six points in total, in which two arbitrary points are selected in each of region N, region C, and region S partitioned in the TD direction of the film.

IPC Classes  ?

• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08J 5/18 - Manufacture of films or sheets
• G09F 9/30 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
• C08G 73/14 - Polyamide-imides
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors

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. 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.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08G 73/14 - Polyamide-imides
• G02B 1/14 - Protective coatings, e.g. hard coatings

Abstract

The embodiments provide a polyamide-imide-based film, which comprises a polyamide-imide-based polymer, wherein when the coefficients of thermal expansion in the MD direction and TD direction of the film are measured at an interval of 5° C. in a temperature range of 300° C. to 365° C., respectively, the temperature at which the coefficient of thermal expansion in the MD direction or the coefficient of thermal expansion in the TD direction changes from a positive value to a negative value is 330° C. to 345° C., a process for preparing the same, and a cover window and a display device comprising the same.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
• B29C 41/00 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor
• B29C 41/46 - Heating or cooling
• B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
• B32B 27/34 - Layered products essentially comprising synthetic resin comprising polyamides
• B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups

Abstract

The embodiments provide a polyamide-based film, which comprises a polyamide-based polymer and has an RSRA value of 3.4 m/N to 5.0 m/N as represented by the following Equation 1 based on the thickness of the film of 50 μm, and which is excellent in loop stiffness, static flexural characteristics, and folding characteristics while securing mechanical and optical properties at least a certain level, a process for preparing the same, and a cover window and a display device comprising the same. RSRA=(RSRMD+RSRTD)/2 In Equation 1, RSRMD is the loop stiffness value measured with the MD direction of the film as the longitudinal direction at room temperature, and RSRTD is the loop stiffness value measured with the TD direction of the film as the longitudinal direction at room temperature.

IPC Classes  ?

• C08G 69/32 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound
• B32B 27/20 - Layered products essentially comprising synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
• B32B 27/34 - Layered products essentially comprising synthetic resin comprising polyamides
• B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance

Abstract

The embodiments relate to a polyamide-based film that is excellent in optical properties and mechanical properties, to a process for preparing the same, and to a cover window and a display device comprising the same. It comprises a polyamide-based polymer and a filler in an amount of 600 ppm or more relative to the weight of the polyamide-based polymer, wherein when the 3D surface roughness thereof is measured, the number of summits per unit area (Sds) is 4,400/mm2 or less.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08K 3/36 - Silica
• C08J 5/18 - Manufacture of films or sheets
• B32B 27/34 - Layered products essentially comprising synthetic resin comprising polyamides
• B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties

Abstract

The embodiments provide a polyamide-based film, which comprises a polyamide-based polymer and has a light resistance index of 0.660 GPa-1 or less as represented by the following Equation 1, whereby it has excellent mechanical properties, optical properties, and light resistance. [Equation 1] Light resistance index=ΔYI/Y. In Equation 1, Y is the modulus of the film, and ΔYI is the rate of change in yellow index (YI) of the film before and after a light resistance test in which UV rays are irradiated to the film at 60° C., the UV irradiation is stopped, and water is sprayed at 50° C.

IPC Classes  ?

• C08G 69/32 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound
• B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• B32B 27/06 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance
• B32B 27/34 - Layered products essentially comprising synthetic resin comprising polyamides
• C08K 5/00 - Use of organic ingredients
• C08K 5/3475 - Five-membered rings condensed with carbocyclic rings

Abstract

The embodiments relate to a polyamide-based composite film that has excellent curl characteristics, mechanical properties, and optical properties, as well as, in particular, is effective in preventing reflection in the visible light region, remarkably reduces the rainbow phenomenon, and achieves a texture similar to that of glass, and a display device comprising the same. There are provided a polyamide-based composite film, which comprises a base film comprising a polyamide-based polymer; and a functional layer disposed on the base film, wherein the in-plane retardation (Re) measured with light having a wavelength of 550 nm is 100 nm to 220 nm, and a display device comprising the same.

IPC Classes  ?

• B32B 27/34 - Layered products essentially comprising synthetic resin comprising polyamides
• B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
• B32B 27/20 - Layered products essentially comprising synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
• B32B 27/30 - Layered products essentially comprising synthetic resin comprising vinyl resinLayered products essentially comprising synthetic resin comprising acrylic resin
• B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups

Abstract

Provided is a window including a base layer, a hard coating layer disposed above the base layer, and a bonding layer disposed between the base layer and the hard coating layer. The bonding layer includes polysiloxane.

IPC Classes  ?

• C09J 133/08 - Homopolymers or copolymers of acrylic acid esters
• G02B 1/14 - Protective coatings, e.g. hard coatings
• C09J 175/04 - Polyurethanes
• C09J 183/04 - Polysiloxanes
• B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups
• B32B 27/36 - Layered products essentially comprising synthetic resin comprising polyesters
• B32B 17/00 - Layered products essentially comprising sheet glass, or fibres of glass, slag or the like
• B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties

Abstract

An embodiment can provide a polyamide-imide film and a method for producing same, the film comprising a polyamide-imide polymer formed by polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, wherein, in an XRD graph with a section in which 2θ=8° to 32° as a baseline, the film shows a peak area of 50% or above around 2θ=23° with respect to a peak area seen around 2θ=15°.

IPC Classes  ?

• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 39/24 - Feeding the material into the mould
• B29C 39/38 - Heating or cooling
• B29C 39/42 - Casting under special conditions, e.g. vacuum
• B29C 39/44 - Measuring, controlling or regulating
• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 41/00 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor
• B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material
• B29K 105/00 - Condition, form or state of moulded material

Abstract

The embodiments relate to a polyamide-based composite film with excellent curl characteristics, mechanical characteristics, and optical characteristics. The polyamide-based composite film comprises a base film comprising a polyamide-based polymer and a functional layer disposed on the base film, wherein when the polyamide-based composite film is placed on a surface light source such that the base film is in contact with the surface light source, light is irradiated from the surface light source, and the luminance value measured in the normal direction of the surface light source is 100%, the luminance value measured in the direction of 50° from the normal direction of the surface light source is 25% or more.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08K 3/30 - Sulfur-, selenium-, or tellurium-containing compounds
• G02B 1/14 - Protective coatings, e.g. hard coatings

Abstract

2).

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups
• C08G 69/32 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids from aromatic diamines and aromatic dicarboxylic acids with both amino and carboxylic groups aromatically bound
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08G 73/14 - Polyamide-imides

Abstract

The embodiments relate to a polyamide-imide film excellent in optical properties and mechanical properties, to a process for preparing the same, and to a cover window and a display device comprising the same. There are provided a polyamide-imide film, which comprises a polyamide-imide polymer and has a reduced modulus of a top surface measured by the nanoindentation method according to the ISO 14577-2 standard of 5.6 GPa or more and a haze of 1% or less, a process for preparing the same, and a cover window and a display device comprising the same.

IPC Classes  ?

• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• C08K 3/30 - Sulfur-, selenium-, or tellurium-containing compounds
• C08K 3/36 - Silica

Abstract

2.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 39/00 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor
• B29C 39/14 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor for making articles of indefinite length
• B29C 39/38 - Heating or cooling
• B29K 79/00 - Use of other polymers having nitrogen, with or without oxygen or carbon only, in the main chain, as moulding material
• B29L 7/00 - Flat articles, e.g. films or sheets

Abstract

p a value of a dipolar component in Hansen solubility parameter of the dipolar solvent.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets

Abstract

In the optical sheet according to an embodiment, at least one organic dye that selectively absorbs light in a specific wavelength band is added to a prism pattern layer, whereby it is possible to provide an optical sheet by a simpler manufacturing process than before, in which the color gamut is enhanced while a decrease in luminance due to light absorption is minimized. In addition, it is possible to secure optical and mechanical properties while preventing a degradation of organic dyes due to UV curing by adjusting the composition of the prism pattern layer.

IPC Classes  ?

• G02B 5/04 - Prisms
• C09D 5/32 - Radiation-absorbing paints
• C09D 7/48 - Stabilisers against degradation by oxygen, light or heat
• C09D 7/63 - Additives non-macromolecular organic
• G02B 5/00 - Optical elements other than lenses
• G02B 5/20 - Filters
• G02B 5/30 - Polarising elements

Abstract

The embodiments relate to a polyamide-based film excellent in optical properties such as transmittance, haze, and yellow index and mechanical properties such as modulus and thickness uniformity, to a process for preparing the same, and to a cover window and a display device comprising the same. The polyamide-based film comprises a polyamide-based polymer and has an XRD pattern comprising a first peak whose highest point is located in a section where 2θ is 14° to 16°.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• G02B 1/14 - Protective coatings, e.g. hard coatings

Abstract

The embodiments relate to a polyamide-based composite film that not only has excellent curl characteristics, mechanical properties, and optical properties, but also exhibits a privacy protection effect at a wide angle of view and glossiness characteristics similar to those glass at a main angle of view, and to a display device comprising the same. There are provided a polyamide-based composite film that comprises a base film comprising a polyamide-based polymer; and a functional layer disposed on the base film, wherein a glossiness control value according to Equation 1 is 0 or more, and a displace device comprising the same.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08G 69/28 - Preparatory processes
• C08K 3/36 - Silica

Abstract

In the display device according to an embodiment, optical functional elements such as a prism sheet and a light diffusion layer are combined, and an optical composite sheet to which a light absorbing layer that selectively absorbs light of a specific wavelength band is inserted is used, so that the color gamut can be enhanced as compared with the prior art.

IPC Classes  ?

• G02F 1/1335 - Structural association of cells with optical devices, e.g. polarisers or reflectors
• F21V 8/00 - Use of light guides, e.g. fibre optic devices, in lighting devices or systems
• G02F 1/13357 - Illuminating devices

Abstract

An optical composite sheet is disclosed. In the optical composite sheet, optical functional elements such as a prism sheet and a light diffusion layer are combined, and a light absorbing layer that selectively absorbs light of a specific wavelength band is inserted, so that the optical performance and color gamut can be enhanced as compared with the prior art. In particular, the color transmittance of the optical composite sheet with respect to wavelength measured for each viewing angle satisfies a specific relationship, whereby it is possible to effectively reduce the color deviation with respect to the viewing angle.

IPC Classes  ?

• F21V 8/00 - Use of light guides, e.g. fibre optic devices, in lighting devices or systems

Abstract

In the optical composite sheet according to an embodiment, optical functional elements such as a prism sheet and a light diffusion layer are combined, and a light absorbing layer that selectively absorbs light of a specific wavelength band is inserted, so that the optical performance and color gamut can be enhanced as compared with the prior art. In particular, it is possible to minimize the decrease in luminance due to the absorption of light by the light absorbing layer while enhancing the color gamut by adjusting the lamination configuration of the optical composite sheet.

IPC Classes  ?

• G02B 5/02 - Diffusing elementsAfocal elements
• G02B 5/00 - Optical elements other than lenses
• G02B 5/04 - Prisms
• G02B 5/30 - Polarising elements

Abstract

Embodiments relate to a polyimide-based composite film, which comprises a base film comprising a polyimide-based resin; and a functional layer disposed on the base film, wherein when the side of the functional layer located opposite to the side in contact with the base film is referred to as a first side and when the side of the base film in contact with the functional layer is referred to as a second side, the leveling index represented by Equation 1 is less than 0.75.

IPC Classes  ?

• H05K 5/03 - Covers
• H05K 5/00 - Casings, cabinets or drawers for electric apparatus
• C08K 3/36 - Silica
• C08K 3/30 - Sulfur-, selenium-, or tellurium-containing compounds
• C08K 3/26 - CarbonatesBicarbonates
• C08J 5/18 - Manufacture of films or sheets
• B29C 39/14 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor for making articles of indefinite length
• B29K 79/00 - Use of other polymers having nitrogen, with or without oxygen or carbon only, in the main chain, as moulding material
• B29L 31/34 - Electrical apparatus, e.g. sparking plugs or parts thereof
• H10K 50/84 - PassivationContainersEncapsulations

Abstract

The polymer film according to an embodiment comprises at least one polymer resin selected from the group consisting of a polyamide-based resin, a polyimide-based resin, and a polyamide-imide-based resin, and has a haze of 0.6% or less and an in-plane retardation within a specific range for each wavelength band in the visible light region. The polymer film, which has an in-plane retardation within a specific range for each wavelength band in the visible light region, is excellent in transparency and optical properties, and it can remarkably reduce the rainbow phenomenon and improve the reflection appearance.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets

Abstract

R value defined in Equation 1a of 75% or more.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• C08K 3/26 - CarbonatesBicarbonates
• C08K 3/105 - Compounds containing metals of Groups 1 to 3 or of Groups 11 to 13 of the Periodic Table
• C08K 3/16 - Halogen-containing compounds

Abstract

0/9 of Equation A of 2% or less.

IPC Classes  ?

• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08G 69/46 - Post-polymerisation treatment
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 48/08 - Flat, e.g. panels flexible, e.g. films
• B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
• B29C 55/02 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of plates or sheets
• B29K 79/00 - Use of other polymers having nitrogen, with or without oxygen or carbon only, in the main chain, as moulding material
• B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material

Abstract

Embodiments relate to a polyamide-imide film that has a clean appearance and transparency and is excellent in antiblocking properties, a process for preparing the same, and a display front panel and a display device comprising the same. The polyamide-imide film comprises a polyamide-imide polymer formed by polymerizing a diamine compound, a dianhydride compound, and a dicarbonyl compound; and a filler, wherein the dicarbonyl compound comprises a first dicarbonyl compound and a second dicarbonyl compound, the first dicarbonyl compound and the second dicarbonyl compound are structural isomers to each other, and the FH value of Equation 1 is 0.5 or less.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08G 73/14 - Polyamide-imides
• C08K 3/36 - Silica

Abstract

2, and a process for preparing the same.

IPC Classes  ?

• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08K 3/36 - Silica
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08J 5/18 - Manufacture of films or sheets
• C08G 73/14 - Polyamide-imides

Abstract

The embodiments relate to a polyimide-based film, which comprises a first side and a second side opposite to the first side, wherein the modulus asymmetry (MA) according to Equation 1 is 0.03 to 0.2, a process for preparing the same, and a display device comprising the same.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors

Abstract

24 represented by Equation 1a of 500% or less.

IPC Classes  ?

• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08K 5/09 - Carboxylic acidsMetal salts thereofAnhydrides thereof
• C09K 11/02 - Use of particular materials as binders, particle coatings or suspension media therefor

Abstract

50) measured in the direction of 50° from the normal direction of the surface light source is 25% or more.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08G 73/14 - Polyamide-imides
• C08K 3/30 - Sulfur-, selenium-, or tellurium-containing compounds
• G02B 1/00 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements
• C08G 69/26 - Polyamides derived from amino carboxylic acids or from polyamines and polycarboxylic acids derived from polyamines and polycarboxylic acids
• G02F 1/13363 - Birefringent elements, e.g. for optical compensation

Abstract

2·day or less; and a functional layer.

IPC Classes  ?

• G06F 1/16 - Constructional details or arrangements
• B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
• B29C 48/91 - Heating, e.g. for cross linking
• B29C 55/00 - Shaping by stretching, e.g. drawing through a dieApparatus therefor
• B29C 55/08 - Shaping by stretching, e.g. drawing through a dieApparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
• C08G 73/14 - Polyamide-imides
• G02B 1/04 - Optical elements characterised by the material of which they are madeOptical coatings for optical elements made of organic materials, e.g. plastics
• G02B 1/14 - Protective coatings, e.g. hard coatings
• B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material

Abstract

Disclosed herein are a polyamide-imide film which is transparent and exhibits superior mechanical properties such as surface hardness, etc. and a method of preparing the same. The polyamide-imide film a copolymer of an aromatic diamine, an aromatic dianhydride, and an aromatic dicarbonyl compound, wherein the aromatic diamine and the aromatic dianhydride forms an imide unit; the aromatic diamine and the aromatic dicarbonyl compound forms an amide unit; and the amide unit accounts for 50-70 mol % of 100 mol % of the units of the copolymer, thereby exhibiting transparency and superior mechanical properties including surface hardness.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors

Abstract

One embodiment may provide a method for producing a polyimide film, the method comprising the steps of: polishing the surface of a casting body; producing a gel sheet by casting a precursor on the polished surface of the casting body, and drying same; and producing a polyimide film by heat-treating the gel sheet, wherein the roughness of the polished surface of the casting body is 0.1 nm to 160 nm, and when the area of the casting body onto which the precursor is casted is partitioned by 1 cm×1 cm, the area corresponding to a defect reduction region is at least 90%, and the polyimide film has a yellowness of at most 3, a haze of at most 1%, a permeability of at least 88%, a modulus of at least 5.0 GPa and a surface hardness of at least HB.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• C08L 77/00 - Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chainCompositions of derivatives of such polymers

Abstract

An embodiment can provide a method for producing a polyamide-imide film which is colorless and transparent and has excellent mechanical properties, the method comprising: a step of producing a polyamide-imide polymer solution by polymerizing an aromatic diamine compound, an aromatic dianhydride compound, and a dicarbonyl compound; a step of producing a gel sheet by extruding, casting and drying the polymer solution; and a step of producing a polyamide-imide film by heat-treating the gel sheet, wherein the viscosity of the polymer solution is 100,000 to 500,000 cps, and the polyamide-imide film has a yellowness index of 5 or lower, a haze of 2% or lower, a transmittance of 85% or above and a modulus of 5.0 GPa or above, at a thickness of 20 μm to 75 μm.

IPC Classes  ?

• B29C 39/00 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor
• B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
• B29C 39/44 - Measuring, controlling or regulating
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08G 73/14 - Polyamide-imides
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29K 79/00 - Use of other polymers having nitrogen, with or without oxygen or carbon only, in the main chain, as moulding material

Abstract

An embodiment can provide a polyamide-imide film and a method for producing same, the film comprising a polyamide-imide polymer formed by polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, wherein, in an XRD graph with a section in which 2θ=8° to 32° as a baseline, the film shows a peak area of 50% or above around 2θ=23° with respect to a peak area seen around 2θ=15°.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• B29C 39/24 - Feeding the material into the mould
• B29C 39/38 - Heating or cooling
• B29C 39/42 - Casting under special conditions, e.g. vacuum
• B29C 39/44 - Measuring, controlling or regulating
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 41/00 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor
• B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material
• B29K 105/00 - Condition, form or state of moulded material

Abstract

An embodiment can provide a polyamide-imide film, which has particular punching properties, is colorless and transparent and has excellent mechanical properties and optical properties, and a method for preparing same. The polyamide-imide film comprises a polyamide-imide polymer, which is formed by means of polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, and satisfies the condition of general formula (1) below. General formula (1) 4≤X/Y≤12 X: the maximum hole diameter (mm) comprising cracks when the film is punched at 10 mm/min using a 2.5 mm spherical tip by means of a UTM compression mode Y: the modulus (GPa) of the film.

IPC Classes  ?

• C08J 5/18 - Manufacture of films or sheets
• C08G 73/14 - Polyamide-imides
• B29C 39/24 - Feeding the material into the mould
• B29C 39/38 - Heating or cooling
• B29C 39/42 - Casting under special conditions, e.g. vacuum
• B29C 39/44 - Measuring, controlling or regulating
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 41/00 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor
• B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material
• B29K 105/00 - Condition, form or state of moulded material

Abstract

One embodiment may provide a polyamide-imide film which is colorless and transparent while having an adequate level of solubility and excellent mechanical properties, the polyamide-imide film comprising a polyamide-imide polymer formed by polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, wherein, for a square cross-section of 1 cm×1 cm and a thickness of 30 um to 100 mm, the polyamide-imide film has a dissolution time of 5-60 minutes in 10 ml of dimethylacetamide (DMAc), and for a thickness of 50 mm, the polyamide-imide film has a yellowness of at most 5, a haze of at most 2%, a permeability of at least 85% and a modulus of at least 5.0 GPa.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• B29C 39/24 - Feeding the material into the mould
• B29C 39/38 - Heating or cooling
• B29C 39/42 - Casting under special conditions, e.g. vacuum
• B29C 39/44 - Measuring, controlling or regulating
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 41/00 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor
• B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material
• B29K 105/00 - Condition, form or state of moulded material

Abstract

One embodiment relates to a method for preparing a polyamide-imide film which is colorless and transparent and has good mechanical properties, easily and efficiently in terms of yield. Particularly, the embodiment relates to a preparation method capable of obtaining a polyamide-imide film of which the optical characteristics, mechanical properties and flexibility are harmoniously improved without complicated processes, by controlling the amount of imide repeating units and amide repeating units constituting the polyamide-imide film.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• B29C 39/00 - Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressureApparatus therefor
• B29C 39/42 - Casting under special conditions, e.g. vacuum
• B29D 7/01 - Films or sheets
• C08K 5/136 - Phenols containing halogens
• C08K 5/17 - AminesQuaternary ammonium compounds
• C08L 79/08 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29K 79/00 - Use of other polymers having nitrogen, with or without oxygen or carbon only, in the main chain, as moulding material

Abstract

Embodiments relate to a process for preparing a poly(amide-imide) film and a poly(amide-imide) film prepared thereby. The process is capable of preparing a poly(amide-imide) film that is excellent in optical properties and mechanical properties.

IPC Classes  ?

• C08G 73/14 - Polyamide-imides
• C08J 5/18 - Manufacture of films or sheets
• C08G 73/10 - PolyimidesPolyester-imidesPolyamide-imidesPolyamide acids or similar polyimide precursors
• B29C 41/00 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor
• B29C 41/28 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped articleApparatus therefor for making articles of indefinite length by depositing flowable material on an endless belt
• B29C 41/46 - Heating or cooling
• B29C 41/52 - Measuring, controlling or regulating
• B29K 77/00 - Use of polyamides, e.g. polyesteramides, as moulding material
• B29K 105/00 - Condition, form or state of moulded material