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Polyester film, protective film and preparation method thereof

A technology of polyester film and protective film, which is applied in the direction of film/sheet adhesives, chemical instruments and methods, and synthetic resin layered products. problem, to achieve the effect of ensuring visibility, excellent visibility, excellent transparency and durability

Pending Publication Date: 2022-06-07
SKC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] As another example, Korean Laid-Open Patent No. 2014-0013155 discloses a protective cover with a curved surface formed by a multi-layer printing layer, but this protective cover needs to prepare a multi-layer printing layer, so the preparation process is complicated, and depending on the number of layers of the printing layer Since the curved surface is formed, it is difficult to correctly respond to various products with different shapes of the curved surface

Method used

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  • Polyester film, protective film and preparation method thereof
  • Polyester film, protective film and preparation method thereof
  • Polyester film, protective film and preparation method thereof

Examples

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preparation example Construction

[0156] Preparation method of polyester film

[0157] A method for preparing a polyester film of another example includes: the steps of preparing a mixture of the first polyester resin and the second polyester resin; the step of melt-extruding the above mixture to prepare an unstretched sheet; at 70° C. to 125° C. The above-mentioned unstretched sheet is stretched 1 to 1.5 times along the first direction at a temperature of 100000 , and 3 to 5 times is stretched along the second direction perpendicular to the first direction to prepare a stretched film; and in The step of thermally fixing the above-mentioned stretched film at a temperature of 160° C. to 230° C. to prepare a polyester film, the above-mentioned first polyester resin contains more than 95 mole percent of terephthalic acid as a dicarboxylic acid component and terephthalic acid as a diol component. More than 95 mole percent ethylene glycol, the second polyester resin described above comprises greater than 95 mole pe...

Embodiment approach

[0308] The above is explained in more detail by way of examples. However, the following examples are only for illustrating the present invention, and the scope of the examples is not limited to the following examples.

[0309] Preparation of polyester film

Embodiment 1-1

[0311] 97 weight percent of the first polyester resin and 3 weight percent of the second polyester resin were mixed. The above-mentioned first polyester resin is a polyethylene terephthalate resin (manufacturer: SKC) which is a mixture of ethylene glycol and terephthalic acid in a molar ratio of 1:1. 77 mol% of ethylene glycol, 18 mol% of neopentyl glycol, 5 mol% of diethylene glycol as diol components and 100 mol% of terephthalic acid as dicarboxylic acid components are mixed based on the number of moles , thereby preparing the above-mentioned second polyester resin.

[0312]After the mixture of the first polyester resin and the second polyester resin was melted at a temperature of 270°C and extruded using a T-die, an unstretched sheet was prepared by cooling with a casting roll at 35°C. . The above-mentioned unstretched sheet was transferred at a speed of 16.5 m / min, preheated to 95°C, stretched 1.1 times in the MD direction at a temperature of 85°C, and stretched 4.3 time...

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Abstract

An embodiment of the present invention relates to a polyester film having excellent durability, transparency, and visibility and a method for preparing the same, the polyester film comprising a first polyester resin and a second polyester resin containing a diol and a dicarboxylic acid in specific components and contents, having excellent mechanical properties such as tensile strength and impact strength, and also having an outstanding fingerprint recognition rate, and having excellent durability, transparency, and visibility. The liquid crystal display panel can exert excellent characteristics when applied to display devices such as smart phones, tablet computers and laptops. Moreover, an example relates to a protective film having excellent scratch resistance, flexibility, durability, transparency, and visibility, and a method for manufacturing the same, the protective film including a curable resin layer interposed between a first substrate layer and a second substrate layer having a thickness thinner than the first substrate layer, the curable resin layer having excellent scratch resistance, flexibility, durability, transparency, and visibility when cured, and a method for manufacturing the same. The first substrate layer and the second substrate layer form a curved surface portion, can be completely attached to a curved surface when applied to a curved-surface-shaped display device, and can exert excellent characteristics when applied to the curved-surface-shaped display device.

Description

technical field [0001] Examples relate to polyester films, protective films and methods of making them. Background technique [0002] Polyester film has excellent dimensional stability and optical transparency, and is widely used not only as a material for display devices, but also as a material for various industries. However, although polyester film has excellent transparency, its durability and heat resistance are lower than that of polyimide film. Therefore, studies that can improve durability and heat resistance without reducing the dimensional stability and optical transparency of polyester films have continued. [0003] In addition, recently, various display devices having a three-dimensional curved shape capable of realizing a gorgeous aesthetic feeling or an excellent screen feel are being used. In particular, in the case of portable mobile devices such as smartphones and tablet PCs that are frequently used in daily life, products having a three-dimensional curved...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08J5/18B32B27/36B32B27/06B32B37/00B32B33/00C09J7/29
CPCC08J5/18B32B27/36B32B27/08B32B37/00B32B33/00C09J7/29C08J2367/02C08J2467/02B32B2037/243B32B2250/244B32B2255/10B32B2255/26B32B2307/412B32B2307/558B32B2307/552C09J2467/006
Inventor 柳雅林李世喆李善基金建旭崔相珉朴珍奭刘仲原
Owner SKC CO LTD
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