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Hard-coating film, process for producing the same, and antireflection film

一种制造方法、硬涂膜的技术，应用在化学仪器和方法、涂层、仪器等方向，能够解决消除干涉图案、波长依赖性变大、画面闪烁增强等问题，达到减少干涉图案、着色不均减低、降低着色不均的效果

Active Publication Date: 2009-09-02
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to make the refractive index of the hard coat layer or adhesive layer consistent with the in-plane refractive index of ordinary biaxially oriented polyester films, which is about 1.60 to 1.65, and it is not possible to obtain a film that satisfies the conditions by using the existing technology. to the extent that interference patterns are completely eliminated
In addition, it is extremely difficult to apply a hard coat uniformly to a thickness that does not interfere with the pattern
[0006] In addition, when only the method of forming roughness on the surface of the base film by hot pressing or the like and providing a hard coat layer is used, there is still a problem that a sufficient reflection suppression effect cannot be obtained although the interference pattern becomes slightly difficult to see.
Furthermore, the method of dissolving or swelling the base film, in the case of a biaxially oriented polyester film, has excellent solvent resistance, so there is almost no suitable solvent, and the only available o-chlorophenol exists to pollute the operating environment, or difficult to remove
In addition, the formation of a mixed layer at the interface between the base film and the hard coat layer increases the haze, and when used in a display, there is a problem that the clarity of the transmitted image decreases, or the hard coat layer on the surface becomes smoother, so it cannot be expected. Improvement effect of external light reflection
[0007] In addition, the ordinary hard coat layer is extremely smooth, so there is a problem that when antireflection processing is performed on the hard coat layer, the wavelength dependence of the intensity of reflected light on the surface of the antireflection layer becomes large, and a strong specific color can be seen. or uneven coating of the anti-reflection layer resulting in uneven color
[0008] In addition, the method of transferring the concave-convex structure of the forming film to the hard coat layer may mix foreign matter from the forming film, and at the same time, the inclination angle of the concave-convex structure increases, which is prone to screen flickering
The method of adding particles to the hard coat layer to form a concave-convex structure on the surface of the hard coat layer can exhibit the effect of preventing interference patterns and reflections, but there is a problem that the flickering of the screen is enhanced and the visibility is reduced

Method used

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  • Hard-coating film, process for producing the same, and antireflection film
  • Hard-coating film, process for producing the same, and antireflection film
  • Hard-coating film, process for producing the same, and antireflection film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0243] After fully vacuum-drying polyethylene terephthalate (PET: limit viscosity 0.65dl / g) sheet at 180°C for 3 hours, supply it to a melt extruder, melt it at 285°C, The mold was extruded into a sheet, cooled and solidified on a rotating mirror-faced casting roller with a surface temperature of 20°C by applying static electricity to produce an unstretched sheet. The resulting unstretched sheet is continuously stretched in the longitudinal direction. Stretching in the longitudinal direction was performed by first preheating to 75° C. with a set of rolls arranged continuously, and then heating with 95° C. rolls, and stretching 3.5 times while heating the film surface with a radiation heater. The refractive index in the longitudinal direction of the roll surface side of this film was 1.645, and the surface crystallinity measured by the Raman method was 19%. The roll surface side of this film was coated with a hard coat layer forming a coating composition (H-1) by a Metabar m...

Embodiment 2

[0249] In Example 1, the hard coat film was produced similarly except having used H-2 (Example 2) and H-4 (Example 3) as the coating composition for hard-coat layer formation. The hard coat surface of this hard coat film is Sa18nm, Sku1.6 (Example 2), Sa56nm, Sku1.9. In Example 2, although the surface hardness and interference pattern are slightly inferior, there is no problem and it can be used sufficiently. For the above film, an antireflection film was produced in the same manner as in Example 1. As shown in Table 2, this antireflection film has sufficient practical characteristics in terms of coloring unevenness, visibility, screen flicker, and reflection suppression.

[0250] Moreover, antireflection films B and C were produced using the hard coat film of Example 3. As shown in Table 2, the antireflection film was slightly less effective in suppressing reflection, but there was no problem in terms of practicality.

Embodiment 4～6

[0251] (Examples 4-6, Comparative Example 1)

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Abstract

To provide a hard-coating film which comprises a thermoplastic film and a hard coat layer superposed thereon, has an excellent surface hardness, and is inhibited from generating an interference pattern, and which when applied to an antireflection film, is effective in diminishing screen glittering, external-light reflection, and coloration unevenness caused by reflected light, without impairing image clarity. [MEANS FOR SOLVING PROBLEMS] The hard-coating film is characterized in that it comprises a polyester film and, superposed on at least one side thereof, a hard coat layer having irregularities on the surface and at the interface between the polyester film and the hard coat layer and the hard coat layer surface has such three-dimensional surface roughness parameters that the arithmetic average roughness (Sa) is 15-150 nm, excluding 150 nm, and the kurtosis of the surface height distribution (Sku) is 1.5-5.

Description

technical field [0001] The present invention relates to a hard coat film, a method for producing the same, and an antireflection film using the hard coat film. More specifically, the present invention relates to a hard coat film suitable for an antireflection film for a display or a film for a touch panel, which is characterized by excellent scratch resistance, less interference patterns, and the ability to reflect light when antireflection processing is performed on the surface layer. There is very little coloring unevenness, and in particular, when used as an anti-reflection film for a filter of a plasma TV, it can provide an anti-reflection effect, clarity of a transmitted image, and reduce screen flicker. Background technique [0002] Biaxially oriented polyester film is used in magnetic recording materials, packaging materials, electrical insulation materials, various photographic applications, Various uses such as graphic arts and optical display materials. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04B29C55/14B32B27/36G02B1/11C08J5/18C08J7/043C08J7/044C08J7/046G02B1/10G02B1/111G02B1/14
CPCB29K2995/0031B29C55/085B29C55/026C08J7/04G02B1/105G02B1/11B29K2067/00C08J2367/00Y10T428/31Y10T428/24942Y10T428/24355Y10T428/24364G02B1/111G02B1/14C08J7/043C08J7/046C08J7/044B32B27/36
Inventor 小岛聪史三村尚阿部悠
Owner TORAY IND INC
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