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Photocurable adhesive, polarizing plate, and laminate optical member

A light-curable, adhesive technology, applied in the direction of polarizing elements, optical elements, adhesive types, etc., can solve the problems of high moisture permeability, low moisture permeability, insufficient adhesive strength, etc., and achieve excellent thermal shock resistance , The storage modulus is improved, and the effect of improving the bonding strength

Active Publication Date: 2013-12-11
SUMITOMO CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Triacetyl cellulose has excellent advantages as a protective film: excellent transparency, easy to form various surface treatment layers or optical function layers, and high moisture permeability, and drying after bonding to the polarizer using the above-mentioned water-based adhesive It went smoothly, but on the contrary, there were the following problems: due to the high moisture permeability, the polarizer obtained by laminating it as a protective film was prone to deterioration under conditions such as humidity and heat, such as a temperature of 70°C and a relative humidity of 90%.
[0005] When laminating a protective film made of a resin with low moisture permeability to a polyvinyl alcohol-based polarizer, if the polyvinyl alcohol-based resin commonly used in pasting polyvinyl alcohol-based polarizers and triacetyl cellulose films When an aqueous solution is used as the adhesive, there is a problem that the adhesive strength is insufficient, or the appearance of the obtained polarizer is poor.
This is because a resin film with low moisture permeability is generally hydrophobic, or the water used as a solvent cannot be sufficiently dried due to low moisture permeability, etc.

Method used

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  • Photocurable adhesive, polarizing plate, and laminate optical member
  • Photocurable adhesive, polarizing plate, and laminate optical member
  • Photocurable adhesive, polarizing plate, and laminate optical member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and 2 and comparative example 1-9

[0175] (1) Preparation of photocurable adhesive

[0176] According to the proportion shown in Table 1 (unit is part), each component was mixed, and then degassed to prepare a photocurable adhesive solution. It should be noted that the photocationic polymerization initiator (b1) was blended in the form of a 50% propylene carbonate solution, and Table 1 indicated its solid content.

[0177] [Table 1]

[0178]

[0179] (2) Determination of the viscosity of the adhesive liquid at 25°C

[0180] The viscosity at a temperature of 25° C. was measured for each of the adhesive liquids prepared above using a rotary viscoelasticity measuring device “Physica MCR 301 ” manufactured by Anton Paar. The results are shown in Table 2.

[0181] (3) Determination of the storage modulus of the cured product at 80°C

[0182]Using a coater [bar coater, manufactured by Daiichi Rika Co., Ltd.], on a polyethylene terephthalate film [trade name "Toyobo Ester Film E7002E7002", manufactured by Toyob...

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Abstract

Provided is a photocurable adhesive for pasting a protective film comprising a transparent resin onto a polarizer comprising a polyvinyl alcohol resin film, wherein the photocurable adhesive contains 100 parts by weight of a photo cation curable component (A) and 1-10 parts by weight of a photo cation polymerization initiator (B), the photo cation curable component (A) containing the following (A1)-(A3) at the following amounts relative to the total amount thereof: 60-75 wt% of an alicyclic diepoxy compound (A1) represented by formula (I); 5-35 wt% of a diglycidyl compound (A2) represented by formula (II); and 2-15 wt% of a monofunctional epoxy compound (A3) represented by formula (III).

Description

technical field [0001] The present invention relates to a photocurable adhesive for laminating a polarizer made of a polyvinyl alcohol-based resin film in which a dichroic dye is adsorbed and oriented, and a protective film made of a transparent resin; A polarizing plate in which a protective film is bonded to a polarizer with an adhesive; and a laminated optical member in which other optical layers such as a retardation film are laminated on the polarizing plate. Background technique [0002] A polarizing plate can be used as one of optical components constituting a liquid crystal display device. Generally, a polarizing plate has a structure in which a protective film is laminated on both surfaces of a polarizer, and is incorporated into a liquid crystal display device. There is also known a polarizing plate in which a protective film is provided on only one side of the polarizer, but in many cases, a layer having other optical functions, not just a protective film, but al...

Claims

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Application Information

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IPC IPC(8): C09J163/00B32B27/08B32B27/30C09J11/06G02B5/30C09J7/29
CPCB32B27/08B32B27/30C09J11/06C09J163/00G02B5/3025C08G59/223C08G59/226B32B7/12C09J7/29C08L63/00G02B5/30
Inventor 久米悅夫岩田智
Owner SUMITOMO CHEM CO LTD
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