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Polarizing plate and laminated optical member using photocurable adhesive

A light-curable, optical component technology, applied in the direction of polarizing elements, optical elements, polyether adhesives, etc., can solve the problems of low moisture permeability, insufficient adhesive strength, high moisture permeability, etc., to achieve excellent coating applicability, The effect of reducing bubble defects and improving adhesion

Active Publication Date: 2017-07-28
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 the following excellent advantages as a protective film: excellent transparency, easy to form various surface treatment layers or optical functional layers, high moisture permeability, and drying after bonding on 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 laminated as a protective film was prone to deterioration under conditions of 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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  • Polarizing plate and laminated optical member using photocurable adhesive
  • Polarizing plate and laminated optical member using photocurable adhesive
  • Polarizing plate and laminated optical member using photocurable adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4 and comparative example 1-3

[0178] (1) Preparation of photocurable adhesive

[0179] According to the proportion shown in Table 1 (the unit is part), the above-mentioned photocation curable components and photocation polymerization initiator were mixed, and then defoamed to prepare a photocurable adhesive liquid. 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.

[0180] (2) Determination of the viscosity of the adhesive liquid at 25°C

[0181] 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 1.

[0182] (3) Solubility of protective film

[0183] A retardation film [trade name "N-TAC KC4FR-1", manufactured by Konika Minolta Opto Co., Ltd.] made of an acetylcellulose-based resin and having a thickness o...

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Abstract

Provided is a polarizing plate configured from a polyvinyl alcohol-based polarizer and a transparent protective film pasted onto the polarizer with an adhesive therebetween, wherein the 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), and the photo cation curable component (A) is formed from a photocurable adhesive containing the following (A1)-(A3) at the following quantities relative to the total quantity thereof: 30-85 wt% of an alicyclic diepoxy compound (A1) represented by formula (I); 1-69 wt% of a diglycidyl compound (A2) represented by formula (II), Z being a branch structure; and 1-69 wt% of a monofunctional epoxy compound (A3) represented by formula (III). The weight reduction of the protective film when the protective film is immersed at 23°C for two days in the photocurable adhesive is 0-30 wt%.

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 polarizer made of a polyvinyl alcohol-based resin film in which a dichroic dye is adsorbed and oriented via a photocurable adhesive, And a laminated optical member obtained by laminating another optical layer such as a retardation film 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 protective films are laminated on both surfaces of a polarizer, and is incorporated into 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 optical functions, not just a protective film but also a protective film, is attached to the other side. In addition, as a method for producing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30C09J163/00C09J171/00G02F1/1335
CPCC09J163/00C08G59/223C08G59/226C08L63/00G02B5/3025G02F1/133528G02F2201/50G02F2202/28
Inventor 久米悅夫岩田智永安智高桥利行本间英里
Owner SUMITOMO CHEM CO LTD
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