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Laminated film and polarizer

A technology of laminated film and film surface, which can be used in polarizing elements, layered products, synthetic resin layered products, etc., and can solve the problems of lower display image quality, lower operability, and higher cost.

Active Publication Date: 2017-06-20
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the biaxially stretched polyester film that has been studied so far has higher retardation than the TAC film due to the orientation of the polymer during stretching, so when assembled into a liquid crystal display, there are the following problems: Interfering colors caused by delays are generated, and the quality of displayed images is degraded
In order to solve this problem, a method of controlling delay has been proposed, but it cannot be said that the degree of delay is sufficient (for example, Patent Document 1)
In addition, since a difference in the orientation state of the polymer occurs in the width direction of the film when the biaxially stretched film is produced, even if the target of low retardation can be achieved in a part of the film, there is still the following problem. Uniform and low-retardation films are difficult to obtain in large-area films for large-screen displays; cost increases due to lower product yields
In addition, since the retardation is proportional to the film thickness, the retardation can also be suppressed by reducing the thickness of the film to the level of several μm. However, extreme thinning will reduce the handleability, and it is not practical for polarizer protective films.

Method used

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  • Laminated film and polarizer
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  • Laminated film and polarizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] As the crystalline polyester A, polyethylene terephthalate (PET) having a melting point of 258°C was used. In addition, as the thermoplastic resin B, as an amorphous resin having no melting point, 25 mol% of spirodiol and 30 mol% of cyclohexanedicarboxylic acid copolymerized with ethylene terephthalate (PE / SPG · T / CHDC). The prepared crystalline polyester A and thermoplastic resin B were put into two single-screw extruders, respectively, and were melted at 280°C and kneaded. Then, after passing the crystalline polyester A and thermoplastic resin B through 5 leaf disc filters (Leaf Disc Filter) of the FSS type, while measuring with a gear pump, a laminating device with 51 slits is used to make They merge to obtain a laminate in which 51 layers are alternately laminated in the thickness direction. The method of producing the laminate is carried out in accordance with the description in paragraphs [0053] to [0056] of JP 2007-307893 A. Here, the length and interval of the...

Embodiment 2

[0091] Except that the temperature at the time of stretching in the film width direction was 110° C. in the first half of the stretching interval and 150° C. in the second half of the stretching interval, a film was obtained in the same manner as in Example 1. The obtained film showed the physical properties shown in Table 1. Compared with Example 1, the uniformity of the orientation angle in the film width direction is improved, and the coloring and brightness are improved in the same environment as when actually mounted on a liquid crystal display.

Embodiment 3

[0093] Except that the stretching speed during stretching in the film width direction was adjusted so as to stretch to 70% of the maximum stretching amount in the first half of the stretching zone, a film was obtained in the same manner as in Example 2. The obtained film showed the physical properties shown in Table 1. Compared with Example 2, the uniformity of the orientation angle in the film width direction was further improved, and the coloring and brightness were also good under the same environment as when actually mounted on a liquid crystal display.

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Abstract

A laminated film, which is a laminated film in which A layers formed of crystalline polyester and B layers formed of a thermoplastic resin B different from the crystalline polyester are alternately laminated to a total of 5 or more layers, wherein , the sum of the layer thicknesses of the A layers / the sum of the layer thicknesses of the B layers is 0.1 or more and 1.0 or less, and the retardation measured from the direction perpendicular to the film surface at the center of the laminated film and the retardation relative to the film surface The retardation measured at an angle inclined at 50° in the vertical direction was 1300 nm or less. The present invention provides a high-quality laminated film suitable for use as a polarizer protective film of a polarizing plate for a liquid crystal display, which does not exhibit interference colors when mounted, especially when viewed obliquely with respect to a screen.

Description

Technical field [0001] The invention relates to a laminated film. In more detail, it relates to a laminated film suitable for use as a polarizer protective film. In addition, it also relates to a polarizing plate using the laminated film. Background technique [0002] Thermoplastic resin films, especially biaxially stretched polyester films, have excellent properties in terms of mechanical properties, electrical properties, dimensional stability, transparency, and chemical resistance, so they are used in magnetic recording materials, packaging It is widely used as a base film in various applications such as materials. Especially in recent years, in the field of flat panel displays and touch panels, the demand for various optical films such as polarizer protective films and transparent conductive films used for polarizers has been increasing. Among them, in terms of polarizer protective films, For the purpose of reducing costs and making polarizers into thin films, biaxially st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36B32B7/02B32B27/30G02B5/30
CPCB32B7/02B32B27/30B32B27/36G02B5/3033B32B27/08B32B2250/42B32B2307/42
Inventor 宇都孝行高桥弘造合田亘
Owner TORAY IND INC