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AssigneeSkc Co., Ltd.
InventorsA Rim Yu, Gun Uk Kim, Sechul Lee, Sun Ki Lee, Sang Min Choi, Jin-Seok Park, Jung Won Yu
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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 polyester-based film, which satisfies the following Relationship 2 in a first direction in the plane and the following Relationship 3 in a second direction that is perpendicular to the first direction:
Dependencies are inferred from the claim text.