Photocurable adhesive agent, polarizing plate using the photocurable adhesive agent, method for production of the polarizing plate, optical member, and liquid crystal display device

A light-curable and adhesive technology, applied in the direction of polarizing elements, nonlinear optics, chemical instruments and methods, etc., can solve problems such as insufficient adhesive strength, thermal aging of adhesives, poor appearance, etc., and achieve storage stability Excellent, discoloration-inhibiting effect

Active Publication Date: 2010-01-27
SUMITOMO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In order to solve problems such as insufficient adhesive strength or poor appearance when bonding a polyvinyl alcohol-based polarizer and a protective film with a low moisture permeability by wet lamination, it is considered to extend the length of the drying oven after lamination, but there is a problem that if simply If the length of the drying oven is prolonged, the problem of discoloration caused by thermal aging of the polarizer and adhesive is likely to occur.

Method used

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  • Photocurable adhesive agent, polarizing plate using the photocurable adhesive agent, method for production of the polarizing plate, optical member, and liquid crystal display device
  • Photocurable adhesive agent, polarizing plate using the photocurable adhesive agent, method for production of the polarizing plate, optical member, and liquid crystal display device
  • Photocurable adhesive agent, polarizing plate using the photocurable adhesive agent, method for production of the polarizing plate, optical member, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1，2

[0178] [Example 1, 2, Comparative Example 1, 2]

[0179] After mixing the ingredients described in Table 1, defoaming was performed to obtain the adhesives in Examples 1 and 2 as photocurable adhesives of the present invention. However, the photocationic polymerization initiator (C) was mix|blended as a 50 mass % propylene carbonate solution. Among them, the epoxy resin (A), epoxy resin (B), photocationic polymerization initiator (C), polymerizable monomer (D), and additive component (E) in the table described later have the same as above in the present invention. Meaning of said definition. Wherein, the epoxy resin (A) (that is a-1, a-2, a-3, a-4) and epoxy resin (B) (that is b-1, b) that will be used in Examples and Comparative Examples -2, b-3, b-4, b-5) structures are shown in the following formulae.

[0180]

[0181] On the other hand, after mixing the ingredients described in Table 1, defoaming was performed to obtain the adhesives in Comparative Examples 1 and 2 a...

Embodiment 3、 comparative example 3～7

[0191] After mixing the components described in Table 2, defoaming was performed to obtain the adhesive in Example 3 as the photocurable adhesive of the present invention, and as the photocurable adhesive for comparison to obtain Comparative Example 3, the adhesive in 4. However, the photocationic polymerization initiator (C) was mix|blended as a 50 mass % propylene carbonate solution.

[0192] In addition, after mixing the ingredients described in Table 2, defoaming was performed to obtain the adhesives in Comparative Examples 5 to 7 as thermosetting adhesives for comparison. Among them, the thermal cationic polymerization initiator was mixed as a 66% by mass propylene carbonate solution.

[0193] The photocurable adhesive and thermosetting adhesive obtained above were evaluated for the coloring property which is a characteristic which greatly affects whether it can be applied to an optical film. In order to clarify the difference in color tone, each adhesive is sandwiched ...

Embodiment 4～24

[0206] After mixing the components described in Tables 3 to 9, defoaming was performed to obtain the adhesives in Examples 4 to 24 as the photocurable adhesive of the present invention. Among them, the photocationic polymerization initiator (C) was destroyed into a 50 mass % propylene carbonate solution.

[0207] Using a 10 μm bar coater, apply the above-obtained adhesive to an 80 μm-thick UV absorber-containing TAC film (trade name: Fujitech) used as a protective film, and stick polyvinyl alcohol on it. - Iodine polarizer. In addition, using a 10 μm bar coater, each adhesive was coated on a 70 μm thick stretched norbornene film (trade name ZEONOR) manufactured by OPTES Co., Ltd. that had been subjected to a corona discharge treatment to serve as a protective film. The surface of the polarizing plate opposite to the surface to which the TAC film was bonded was bonded, and protective films were bonded to both surfaces of the polarizing plate. For this, an ultraviolet irradiat...

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Abstract

The invention provides a photocurable adhesive agent which has excellent storage stability, can prevent the discoloration of the adhesive agent itself or a material to be adhered during curing, has a high curing rate, and can provide good adhesion; a polarizing plate using the photocurable adhesive agent; a method for producing the polarizing plate; an optical member; and a liquid crystal displaydevice. Specifically, the invention discloses a photocurable adhesive agent for adhering a protective film to a polarizer comprising a polyvinyl alcohol resin film having iodine or a dichroic dye adsorbed and oriented thereon. The photocurable adhesive agent comprises: 100 parts by mass of an epoxy resin (A) having two or more epoxy groups in the molecule, wherein at least one of the epoxy groupsis an alicyclic epoxy group; 5 to 1000 parts by mass of an epoxy resin (B) having two or more epoxy groups in the molecule and containing substantially no alicyclic epoxy group; and 0.5 to 20 parts by mass of a photo-cationic polymerization initiator (C).

Description

technical field [0001] The present invention relates to a specific photocurable adhesive, a polarizing plate obtained by laminating a protective film on one or both sides of a polarizer using the photocurable adhesive, a method for producing the same, and a polarizing plate using the photocurable adhesive. Optical components and liquid crystal display devices. Background technique [0002] A polarizing plate can be used as one of optical members constituting a liquid crystal display device. A polarizing plate generally has a structure in which protective films are laminated on both sides of the polarizing plate, and can be used as an assembly in a liquid crystal display device. It is also known that a protective film is only arranged on one side of the polarizer, but in many cases, on the other side, it is not a simple protective film, but a layer with other functions such as optical functions is attached as a protective film at the same time. combine. Moreover, as the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C09J163/00C09J7/02C09J11/06G02F1/1335
CPCB32B7/12B32B23/08B32B27/20B32B27/306B32B37/12C08K5/01C09J11/06C09J163/00G02B5/30G02F1/13
Inventor 高桥利行近冈里行岩田智古谷勉
Owner SUMITOMO CHEM CO LTD
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