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Polarization plate and laminated optical component using the same

A polarizing plate and polarizing plate technology, applied in the field of laminated optical components, can solve the problems of aging, machine direction fracture, insufficient adhesive strength, etc., and achieve the effect of good humidity and heat resistance and excellent humidity and heat resistance.

Active Publication Date: 2014-07-30
SUMITOMO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of this, there are problems such as poor physical strength of the polarizer after drying, and easy breakage in the processing direction when it is temporarily wound up.
[0004] The moisture permeability of cellulose triacetate is high, and there is a problem in the polarizing plate bonded as a protective film, such as degradation, etc.
[0005] Aqueous solution of polyvinyl alcohol-based resin that is commonly used as an adhesive for laminating polyvinyl alcohol-based polarizers and cellulose triacetate when bonding a protective film made of a resin with low moisture permeability to a polyvinyl alcohol-based polarizer There is a problem that the adhesive strength is insufficient, or the appearance of the obtained polarizing plate is poor
This is because a resin film with a low moisture permeability is generally hydrophobic, or water, which is a solvent, cannot be sufficiently dried due to a low moisture permeability.

Method used

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  • Polarization plate and laminated optical component using the same
  • Polarization plate and laminated optical component using the same
  • Polarization plate and laminated optical component using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～26 and comparative example 1～13

[0200] (1) Preparation of photocurable adhesive composition

[0201] After mixing the components in the compounding ratio (unit: part) shown in Table 1, defoaming was performed to prepare a photocurable adhesive liquid. In addition, the photocationic polymerization initiator (b1) was mix|blended as 50% propylene carbonate solution, and was shown by the solid content amount in Table 1.

[0202] 【Table 1】

[0203]

[0204] (2) Production of polarizing plate

[0205] Corona discharge treatment was applied to the surface of a cellulose triacetate film with a thickness of 80 μm [trade name "Fujitaku", manufactured by Fujifilm Co., Ltd.] containing an ultraviolet absorber, and a bar coater was used to cure the corona discharge treated surface. The respective adhesive liquids prepared above were applied so that the final film thickness was about 3 μm. A polyvinyl alcohol-iodine polarizing plate was attached to the adhesive layer. In addition, corona discharge treatment was app...

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Abstract

This invention provides a polarizing plate and a laminated optical component using the same. The polarizing plate has a polyvinyl alcohol based polarizer in which a bicolored pigment is oriented by adsorption; and a protection film formed with a transparent resin laminated on at least one surface of the polarizer through an adhesive agent layer. The adhesive agent layer is formed by a photocurable adhesive agent composition containing (A) 100 parts by weight of a cation polymeric compound, (B) 1 to 10 parts by weight of a photo cationic polymerization initiator, (C) 0.1 to 2 parts by weight of a photo-sensitizer showing the maximum absorption with respect to the light having the wavelength longer than 380 nmm, and (D) 0.1 to 10 parts by weight of a naphthalene based photo-sensitizing auxiliary agent represented by the following formula (I) shown in the description; wherein R1 and R2 each independently represents an alkyl group of 1 to 6 carbon atoms). Additionally, this invention provides a laminated optical component.

Description

technical field [0001] The present invention relates to a polarizing plate in which a protective film made of a transparent resin is bonded to a polarizing plate made of a polyvinyl alcohol-based resin. The present invention also relates to a laminated optical member obtained by laminating the polarizing plate on another optical layer. Background technique [0002] A polarizing plate is useful as one of optical members constituting a liquid crystal display device. A polarizing plate usually has a structure in which protective films are laminated on both surfaces of the polarizing plate, and is incorporated in a liquid crystal display device. It is also known that a protective film is provided only on one side of a polarizer, but in many cases, a layer having other functions, such as optical functions, doubles as a protective film instead of a simple protective film. In addition, as a method for producing a polarizing plate, a method of subjecting a uniaxially stretched pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B27/08B32B7/12C09J163/00C09J7/02
CPCC09J163/00G02B5/30G02F1/1335
Inventor 久米悦夫竹内智康中川弘也
Owner SUMITOMO CHEM CO LTD
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