Polarizing plate protective film, polarizing plate and resistive touch panel

A technology of polarizer and protective film, applied in polarizing elements, transportation and packaging, electrical digital data processing, etc., can solve the problems of reduced polarization, changes, complex manufacturing processes, etc., to achieve the effect of improving adhesion

Inactive Publication Date: 2009-10-28
GUNZE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, this polarizer usually has the following problems: in order to bond the TAC film to the polarizer, it is necessary to carry out saponification treatment on the surface of the film. complex manufacturing process for device bonding
In addition, due to the high water absorption and moisture permeability of the TAC film, in a high-temperature and high-humidity environment, there are short-term reductions in polarization, hue changes, light leakage in the crossed Nicols state, and large dimensional changes in polarizers. And other issues
[0005] As films other than TAC films, for example, polycarbonate, acrylic polymers, etc. have been tried to be used as protective films for polarizers, but it is difficult to bond the film to the polarizer, and the reality is that it has not yet been put into practical use.
[0006] In addition, in recent years, as input devices such as car navigation, a resistive film-type low-reflection touch panel with a polarizer placed on the surface has been applied. Cause of failure

Method used

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  • Polarizing plate protective film, polarizing plate and resistive touch panel
  • Polarizing plate protective film, polarizing plate and resistive touch panel
  • Polarizing plate protective film, polarizing plate and resistive touch panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] The preparation of embodiment 1 protective film

[0111] Using the melt molding T-die method, under the conditions of resin temperature 270°C and pulling roll temperature 140°C, cyclic olefin resin (copolymer of norbornene and ethylene, trade name "TOPAS6015", Topas Advanced polymers company manufactured, with a number average molecular weight of 45,800 and a glass transition temperature of 160°C) to obtain an optically isotropic film with a thickness of 200 μm.

[0112] Further, the obtained film was stretched 2.0 times in the width direction at 170° C. using a clip tenter type transverse stretching device to obtain a retardation film having a thickness of 100 μm and a retardation of 138 nm.

[0113] Then, in the air at a processing speed of 100W / m 2 · minute, corona discharge treatment was performed on both surfaces of the obtained optically isotropic film and retardation film, respectively, so that the wetting tension might become 500 micrometers N / cm (23 degreeC). ...

manufacture example 1

[0116] Production Example 1 Preparation of Polarizer

[0117] A polyvinyl alcohol film (trade name "Kuraray vinylon film (Kuraray vinylon film) VF-9X75R", manufactured by Kuraray, thickness 75 μm) was immersed in 5000 parts by weight of water, 35 parts by weight of iodine, and 525 parts by weight of potassium iodide. Parts of aqueous solution for 5 minutes to make it absorb iodine. Next, the film was uniaxially stretched 4.4 times in the longitudinal direction in a 4% by weight aqueous solution of boric acid at 45° C., and then dried under tension to obtain a polarizer (polarizing film) with a thickness of 17 μm.

Embodiment 2

[0118] The preparation of embodiment 2 polarizer

[0119] As the binder, a 1.5% by weight aqueous solution of polyvinyl alcohol having an average degree of polymerization of 1,800 and a degree of saponification of 99% was used. Apply the adhesive to both sides of the polarizing film obtained in Manufacturing Example 1 so that the thickness after drying reaches 1 μm. The polarizing plate obtained in 1 was laminated in such a way that the silane coupling agent-coated surface of the protective film (1-1) was in contact, and was laminated on a rubber roller / metal roller (rubber roller diameter 200mm, metal roller diameter 350mm, linear pressure 10kg / cm) were clamped (two pumps), and dried in an oven at 40°C for 24 hours.

[0120] In addition, one side of the polarizing film obtained in Production Example 1 was passed through the silane coupling agent layer of the polarizer protective film (1-1) obtained in Example 1, and the other side of the film was passed through the silane c...

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Abstract

Disclosed is a polarizing plate protective film which is obtained by forming a silane coupling agent layer on one side of a cyclic olefin resin film. Also disclosed are a polarizing plate wherein such a protective film is arranged on one side or both sides of a polarizer through the isocyanate silane coupling agent layer, and a resistive touch panel using such a polarizing plate.

Description

technical field [0001] The present invention relates to a polarizer protective film, a polarizer using the protective film, and a resistive touch panel using the polarizer. Background technique [0002] Polarizers are components used to form image display devices such as liquid crystal displays (LCDs), electroluminescence displays (ELDs), and plasma displays, and are formed by bonding a protective film to at least one side of a polarizer (polarizing film) . [0003] So far, as a polarizing plate, a layer structure of TAC film / polarizer / TAC film (for example, refer to Patent No. Literature 1). [0004] However, this polarizer usually has the following problems: in order to bond the TAC film to the polarizer, it is necessary to carry out saponification treatment on the surface of the film. The complex manufacturing process of device bonding. In addition, due to the high water absorption and moisture permeability of the TAC film, in a high-temperature and high-humidity envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08J7/04C08J7/043
CPCC08J7/065G02B1/105G06F3/045G02B5/3025C08J2365/00Y10T428/31663G02B1/14C08J7/043G02B5/3083G02B5/3033
Inventor 羽根友子石井良典
Owner GUNZE LTD
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