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Polarizing plate with pressure-sensitive adhesive layer

A pressure-sensitive adhesive layer and pressure-sensitive adhesive technology, applied in the field of polarizers, can solve the problems of poor followability of polarizer height differences, difficulty in pasting polarizers, poor appearance, etc., to prevent abnormal appearance and prevent peeling. Effect

Inactive Publication Date: 2016-03-30
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the level difference followability of the polarizing plate described in International Patent WO2009 / 069799A is poor, and thus is caused by a light-shielding layer corresponding to a frame portion of a liquid crystal display panel when compared with an uneven surface (for example, an optical film such as a surface with a pattern). There is a problem with the adhesion of the conductive film with a height difference)
When using a polarizing plate with poor height followability, poor appearance is likely to occur, and this problem becomes more pronounced in connection with the thinning of the polarizing plate
In addition, there is a problem that it is difficult to stick the polarizing plate described in International Patent WO2009 / 069799A without generating air bubbles

Method used

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  • Polarizing plate with pressure-sensitive adhesive layer
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  • Polarizing plate with pressure-sensitive adhesive layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] Polarizing plate production

[0143] (Preparation of pressure sensitive adhesive)

[0144] The solution containing the (meth)acrylic polymer (B-1) obtained in Production Example 6 and 0.1 parts by weight of trimethylolpropane xylylene diisocyanate relative to 100 parts by weight of the solid content of the solution (Manufactured by Mitsui, Inc., trade name: "TAKENATED110N"), and 0.3 parts by weight of dibenzoyl peroxide as a crosslinking agent and 0.1 parts by weight of γ-glycidoxypropyl as a silane coupling agent Methoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: "KBM-403") is compounded. Thus, a pressure-sensitive adhesive solution was obtained.

[0145] (Production of polarizing plate with pressure-sensitive adhesive layer)

[0146] Using a fountain coater, uniformly apply the resulting pressure-sensitive adhesive solution to the surface of a polyethylene terephthalate film (substrate) treated with a silicone-based release agent , And dry for 2 min...

Embodiment 2 to 8

[0148] Polarizing plate production

[0149] Except that: those shown in Table 1 were used as a laminate including a polarizing film and a protective film, a (meth)acrylic polymer, and a crosslinking agent; and the thickness of the pressure-sensitive adhesive layer was set as shown in Table 1. Except for the thickness shown, a polarizing plate having a pressure-sensitive adhesive layer was each obtained in the same method as in Example 1. It should be noted that in Example 8, when the pressure-sensitive adhesive solution was produced, lithium trifluoromethanesulfonylimide (manufactured by Morita Chemical Industries Co., Ltd.) was compounded as an antistatic agent.

[0150]

reference example 1

[0165] Except that: Laminate A-4 was used instead of Laminate A-1; and the pressure-sensitive adhesive layer was transferred to the protective film, a polarizing plate (protective film (40 μm) was obtained in the same manner as in Example 1 / Polarizing film (20 μm) / Protective film (40 μm) / Pressure sensitive adhesive layer (20 μm)).

[0166]

[0167] The following evaluations were performed on the optical laminates or the polarizing plates having a pressure-sensitive adhesive layer obtained in Examples, Comparative Examples, and Reference Examples. The results are shown in Table 2.

[0168] (The amount of creep of the pressure-sensitive adhesive layer)

[0169] The end of a polarizing plate with a pressure-sensitive adhesive layer cut into a size of 10mm wide by 50mm long (with a size of 10mm wide by 10mm long) was pasted to the stainless steel plate via the pressure-sensitive adhesive layer and kept at 50°C The resultant was treated in an autoclave at 5 atmospheres for 15 minu...

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Abstract

There is provided a thin polarizing plate with a pressure-sensitive adhesive layer which is excellent in level difference followability and hardly warps. A polarizing plate with a pressure-sensitive adhesive layer of the present invention includes: a protective film, a polarizing film, and a pressure-sensitive adhesive layer in the stated order, wherein: the polarizing plate with a pressure-sensitive adhesive layer has a total thickness of 90 [mu]m or less, the polarizing film has a thickness of 13 [mu]m or less; the pressure-sensitive adhesive layer has a thickness of from 12 [mu]m to 25 [mu]m; and a creep amount when a load of 500 g is applied to the pressure-sensitive adhesive layer for 1 hour is from 80 [mu]m / h to 260 [mu]m / h.

Description

[0001] This application claims the priority of Japanese Patent Application 2014-191680 filed on September 19, 2014 in accordance with Section 119 of 35 U.S.C., which is incorporated herein by reference. Technical field [0002] The present invention relates to a polarizing plate having a pressure-sensitive adhesive layer. Background technique [0003] In recent years, the thinning of image display devices, particularly image display devices for mobile applications, has been progressing, and therefore there has been an increasing demand for thinning of polarizing plates used for image display devices. The means for thinning the polarizing plate is, for example, a method involving protecting the polarizing film with a protective film (for example, Japanese Patent No. 5332599). However, for example, when a polarizing plate of such a structure, that is, a polarizing plate including a polarizing film having one side protected, is attached to any other member, the following problems occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/14C09J7/02
CPCC09J133/066C09J175/04C08G18/6229C08G18/6254C08G2170/40G02B5/305C08F220/1804C08F220/1807C08F220/06
Inventor 秋月伸介外山雄祐
Owner NITTO DENKO CORP