Disclosed is a glass-based flexible cover window with improved strength including a planar portion formed so as to correspond to a planar region of a flexible display and a folding portion formed so as to be connected to the planar portion, the folding portion being formed so as to correspond to a folding region of the flexible display, wherein the flexible cover window includes a glass substrate and a polyimide (PI) coating layer formed on the glass substrate. The PI coating layer is formed on the glass substrate by direct coating, whereby inherent texture of glass is maintained while the overall thickness of the flexible cover window is reduced, and therefore aesthetics of the flexible cover window are improved.

A surface protect material is described that is high in UV resistance, able to protect the surface of the prepreg used as the parent material, able to prevent a fiber composite material from being deteriorated by UV, able to prevent defects during painting, able to serve for control of the resin flow, and is low in the volatilization percentage during curing, where the surface protect material is a coating agent for spraying or manual application comprising an epoxy resin composition containing at least the components [A] to [D]: [A] non-aromatic epoxy resin, [B] pigment having an number average particle size of 0.1 to 10 μm, [C] non-aromatic thermoplastic resin, and [D] cationic curing agent or anionic curing agent.

A polyester-based film having excellent scratch resistance, durability, transparency, and visibility and a process for preparing the same. The polyester-based film comprises a base layer and a coating layer on at least one side of the base layer. The light passage according to Relationship 1 is 91% or more, or the total transmittance for light of 380 nm to 780 nm is 92% or more, it has excellent optical properties, durability, visibility, and reliability. Thus, it can be applied to display devices such as smartphones, tablet PCs, and laptops. In addition, in the polyester-based film according to an embodiment, the strain with respect to tensile load satisfies a specific range, whereby it is possible to achieve the flexibility that hardly causes deformation even when a certain load is maintained for a long period of time. Thus, it can be applied to flexible display devices, particularly, foldable display devices.

A coating including polycarbonate-unit-containing polyurethane resin and 5 mass % or more of nonvolatile matter is applied to a traveling metal strip in a state in which the surface temperature of the metal strip is 60° C. or lower. Next, the coating applied to the metal strip is baked at 80-250° C., and a coating film having a film thickness of 0.3 μm or greater is formed on the traveling metal strip. The proportion of polycarbonate units to the total mass of resin in the coating film is 10-80 mass %. The traveling metal strip is then wound after being cooling to a surface temperature of 80° C. or lower.

A sheet metal member forming method comprises placing a fiber bundle of a predetermined length, via a thermosetting resin, in a predetermined position on a surface of a sheet metal member, forming a coating film on at least a part of the sheet metal member after the placing of the fiber bundle, and while heating and drying the coating film, heat-curing the thermosetting resin to bond the fiber bundle to the sheet metal member.

A sheet metal member forming method comprises placing a fiber bundle of a predetermined length, via a thermosetting resin, in a predetermined position on a surface of a sheet metal member, forming a coating film on at least a part of the sheet metal member after the placing of the fiber bundle, and while heating and drying the coating film, heat-curing the thermosetting resin to bond the fiber bundle to the sheet metal member.

A polyester-based film having excellent scratch resistance, durability, transparency, and visibility and a process for preparing the same. The polyester-based film comprises a base layer and a coating layer on at least one side of the base layer. The light passage according to Relationship 1 is 91% or more, or the total transmittance for light of 380 nm to 780 nm is 92% or more, it has excellent optical properties, durability, visibility, and reliability. Thus, it can be applied to display devices such as smartphones, tablet PCs, and laptops. In addition, in the polyester-based film according to an embodiment, the strain with respect to tensile load satisfies a specific range, whereby it is possible to achieve the flexibility that hardly causes deformation even when a certain load is maintained for a long period of time. Thus, it can be applied to flexible display devices, particularly, foldable display devices.

The present disclosure relates to a cover window for a flexible display device comprising: a light-transmitting substrate; and a first hard coating layer and a second hard coating layer which are formed on both sides of the light-transmitting substrate, respectively, wherein each of the first hard coating layer and the second hard coating layer has IR spectra in which a ratio of the amide C═O peak to the ester C═O peak is in a predetermined range, and a flexible display device including the cover window for a flexible display device.

A method for manufacturing a flexible sheet-shaped material includes a preceding process and a succeeding process. The preceding process is a process for applying a first coating liquid to a material to be coated by a first roll coater. The material to be coated includes a convex portion and becomes the sheet-shaped material. The succeeding process is a process which is performed after the preceding process and which applies a second coating liquid to the material to be coated by a second roll coater. The preceding process is a process for applying the first coating liquid only to the convex portion using a reverse roll coater as the first roll coater. The succeeding process is a process for applying the second coating liquid only to the convex portion by the second roll coater.

A method for fabricating a display panel including a bending area includes: providing a substrate; forming a first flexible layer on the substrate; forming an organic layer on the first flexible layer, wherein a wavelength of light absorbed by the organic layer is different from a wavelength of light absorbed by the first flexible layer; irradiating a part of the organic layer in the bending area with a laser to make at least a portion of the part of the organic layer a carbonized layer, thereby forming a spacer layer; forming a second flexible layer covering the first flexible layer and the spacer layer, wherein the first flexible layer and the second flexible layer are made of a same material and separated by the spacer layer; and cutting a part of the substrate and a part of the first flexible layer in the bending area.