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Window material for display

A display and window material technology, applied in the field of display window material, can solve the problems of lack of chemical resistance, insufficient scratch resistance, difficulty in hard coating with high hardness, etc., and achieves good transparency, excellent strength, and surface resistance. Excellent scratch resistance

Inactive Publication Date: 2007-12-12
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is considered to use a PC (polycarbonate) panel with good transparency and very high impact strength (for example, Patent Document 1), but there are disadvantages that it lacks chemical resistance and it is difficult to obtain a hard coating with high hardness.
[0003] On the other hand, an amorphous transparent sheet made of polyethylene terephthalate, which is one of polyesters, is widely used because it can be formed into various shapes by press molding. It is not preferable to use window materials because of insufficient bending strength and insufficient scratch resistance of the surface
In addition, the biaxially stretched sheet made of polyester has excellent transparency, elastic modulus, and rigidity, but considering the capacity of the stretching machine, the thickness of about 200 μm is the actual limit, and stretching is impossible. To a thickness of 0.5mm or more

Method used

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  • Window material for display

Examples

Experimental program
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Effect test

preparation example Construction

[0062] (Manufacturing method of window material for display)

[0063] When the window material for a display of the present invention contains at least two layers of the above-mentioned polyester biaxially stretched sheet or other resin layers, it contains at least two layers of the above-mentioned polyester biaxially stretched sheet and the above-mentioned other resin layers such as the polycarbonate sheet. , after bonding the above-mentioned interlayers using the above-mentioned adhesive or the like, it is processed into a desired shape as a window material for a display. Various known methods can be used for the processing method, but the cutting method using press processing is particularly preferable because it is the lowest cost and can be formed in large quantities.

[0064] (use)

[0065] The display window material of the present invention can be used as a liquid crystal display device (LCD), a cathode ray tube display device (CRT), an EL display device, a plasma dis...

Embodiment 1

[0085] Terephthalic acid and ethylene glycol were polycondensed to obtain polyethylene terephthalate pellets with an intrinsic viscosity of 0.65 dl / g. After drying, it was put into an extruder, melt-extruded at 285° C., extruded from a T-shaped nozzle into a sheet, and cooled to 70° C. with a cooling roll to obtain a sheet with a thickness of 3400 μm. Then, it was introduced into a tenter for transverse stretching, and after preheating in an atmosphere of 125° C. for 10 seconds, it was stretched to 1.4 times in the transverse direction at a stretching speed of 480% / min. Furthermore, without cooling, the sheet was stretched 2.7 times in the transverse direction at a stretching rate of 1300% / min in an atmosphere of 95° C. to obtain a sheet stretched twice in the transverse direction.

[0086] The obtained sheet was preheated with a roll at 85° C. and heated by infrared rays to maintain the temperature of the sheet at 125° C. while stretching 4.8 times in the longitudinal directi...

Embodiment 2

[0090] Polycarbonate (molecular weight: 27,000, caliber 300-4 manufactured by Sumitomo Dow Co., Ltd.) was melt-extruded at 280°C using a melt extruder equipped with a T-die to obtain unstretched polycarbonate with a thickness of 380 μm. Sheet.

[0091] Polyurethane-based thermal adhesives were coated on both sides of the obtained unstretched polycarbonate sheet, and two sheets of polyethylene terephthalate prepared in Example 1 with a thickness of 188 μm were bonded to one of the coated surfaces. An alcohol ester biaxially stretched sheet was bonded to the other side of this polyethylene terephthalate biaxially stretched sheet to obtain a window material for a display.

[0092] The same test as in Example 1 was performed on the obtained window material for a display, and the results shown in Table 1 were obtained.

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Abstract

This invention provides a window material for a display that comprises a biaxially stretched sheet of a polyester having a multilayer structure of two or more layers, one of which is disposed on an outer layer in a display face in a display, and has a thickness of 0.3 to 5 mm and a light transmittance of 80 to 99.5%. Preferably, the window material for a display has a layer of other resin such as polycarbonate. Further, the window material for a display has a bending strength of 50 to 100 MPa, a bending modulus of elasticity of 3000 to 5500 MPa, and a maximum impact force in a high-speed impact test is not less than 1 kN. The window material for a display is usable as a window material for a display, for example, for liquid crystal display devices (LCDs), cathode-ray tube display devices (CRTs), EL display devices, plasma display devices (PDPs), and projection display devices.

Description

technical field [0001] The present invention relates to a display window material (window material), which is mainly used in liquid crystal display (LCD), cathode ray tube display (CRT), EL display, plasma display (PDP), projection A display unit or display panel of a display unit. Specifically, the display panel is a display window of a personal computer, a television, a digital camera, a video camera, a PDA, or a mobile phone. Background technique [0002] Currently, acrylic resin panels are widely used as display surface materials for liquid crystal display (LCD), cathode ray tube display (CRT), EL display, plasma display (PDP), or projection display. Acrylic resin panels have good transparency, but because they are easy to break, they must have a certain thickness when used in display panels. Recently, however, it is required to reduce the thickness of display surface materials in order to reduce the thickness and weight of devices. Therefore, it is considered to use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F9/30B32B27/36G02F1/1333G09F9/00
CPCG02F1/133305Y10T428/31507Y10T428/31786G02F2001/133331B32B27/36G02F1/133331G09F9/35
Inventor 永见哲
Owner MITSUI CHEM INC
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