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Photocurable adhesive, polarizing plate using same, multilayer optical member and liquid crystal display device

A light-curable and adhesive technology, applied in adhesives, polarizing elements, optical elements, etc., can solve problems such as easy to cause deterioration, high moisture permeability, and insufficient adhesion

Active Publication Date: 2015-10-28
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 good transparency, is easy to form various surface treatment layers and optical functional layers, and has high moisture permeability. It can be dried smoothly after being attached to the polarizer with the above-mentioned water-based adhesive, and has excellent protective film properties. However, due to the high moisture permeability, the polarizing plate bonded as a protective film has problems such as deterioration easily under humid heat conditions such as a temperature of 70°C and a relative humidity of 90%.
The epoxy adhesive disclosed here is particularly effective for laminating various transparent resin films typified by non-crystalline polyolefin resins and cellulose resins to polarizers, but it is particularly effective when acrylic resins are used as protective films. , the adhesive force is obviously not sufficient

Method used

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  • Photocurable adhesive, polarizing plate using same, multilayer optical member and liquid crystal display device
  • Photocurable adhesive, polarizing plate using same, multilayer optical member and liquid crystal display device
  • Photocurable adhesive, polarizing plate using same, multilayer optical member and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14 and comparative example 1

[0243] (1) Preparation of photocurable adhesive

[0244] After mixing the above components, defoaming was performed to prepare photocurable adhesives (liquid) of Examples 1 to 14 and Comparative Example 1. In Table 1, the compounding ratio (unit: part) of each component is shown using a symbol. Furthermore, the photocationic polymerization initiator (b1) was actually compounded as a 50% propylene carbonate solution, and in Table 1, the compounding ratio was shown by the solid content amount.

[0245] [Table 1]

[0246]

(a1)

(a2)

(a2′)

(a3-I)

(a3-II)

(a3-III)

(a4-I)

(a4-II)

(b1)

Example 1

32

55

13

2.25

Example 2

32

55

13

2.25

Example 3

32

55

13

2.25

Example 4

25

50

20

5

2.25

Example 5

25

50

20 ...

Embodiment 15～25 and comparative example 6～7

[0276] Examples 15 to 25 and Comparative Examples 6 to 7 are shown below, which are prepared using an adhesive solution in which water or a diol compound is added to (A) a photocation curable component and (B) a photocation polymerization initiator. Examples of polarizing plates. In addition, in Examples 15-25 and Comparative Examples 6-7, the same thing as what was shown before was used for (A) photocation curable component and (B) photocation polymerization initiator. In addition, the moisture and the diol compound used in Examples 15-25 and Comparative Examples 6-7 are as follows.

[0277] 〈Moisture〉

[0278] purified water

[0279]

[0280] (c1) Ethylene glycol

[0281] (c2)1,2-Propanediol

[0282] (c3)1,4-Butanediol

[0283] (1) Preparation of photocurable adhesive

[0284] After mixing the above components, defoaming was performed to prepare photocurable adhesives (liquid) of Examples 15-25 and Comparative Examples 6-7. In Table 3, the compounding ratio (unit: p...

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Abstract

The present invention is a photocurable adhesive for bonding a protective film that is formed of a transparent resin film to a polarizer that is formed of a polyvinyl alcohol resin film on which a dichroic dye is adsorbed and aligned. This photocurable adhesive contains 100 parts by weight of (A) a cationically photocurable component and 1-10 parts by weight of (B) a cationic photopolymerization initiator. The cationically photocurable component (A) contains (A1) a specific alicyclic diepoxy compound, (A2) a specific diglycidyl compound and (A3) a polymer that is formed from a specific ethylenically unsaturated monomer and has a weight average molecular weight of 5,000-100,000, respectively in predetermined amounts.

Description

technical field [0001] The present invention relates to a photocurable adhesive for laminating a polarizing plate comprising a polyvinyl alcohol-based resin film adsorbed and aligned with a dichroic dye to a protective film comprising a transparent resin film, a polarizing plate using the adhesive, and a laminated optical system. Components and liquid crystal display devices. Background technique [0002] A polarizing plate is useful as one of optical elements 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 is incorporated into a liquid crystal display device. It is known that a protective film is provided only on one side of a polarizing plate, and in many cases, a layer having other optical functions is attached to the other side as a protective film instead of a simple protective film. Furthermore, as a method for producing a polarizing plate, a ...

Claims

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Application Information

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IPC IPC(8): G02B5/30B32B27/30C09J11/06C09J125/00C09J133/00C09J163/00G02F1/1335G02F1/13363
CPCG02B5/3033B32B27/308B32B27/38C08F2220/325C08F2222/1093C08G59/24C08G59/687C09J4/06C09J163/00G02F1/133528G02F2202/28B32B7/10B32B27/306C08L2205/025C08L2205/035G02B5/30G02F1/13363C08L63/00C08L33/12C08L29/10C08L25/14C08F220/325C08F222/1067
Inventor 久米悦夫浅津悠司高桥利行本间英里古川达也
Owner SUMITOMO CHEM CO LTD
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