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Polarizing plate and image display device including the polarizing plate

A polarizing plate and polarizing plate technology, applied in the field of polarizing plates and image display devices containing the polarizing plates, can solve the problems of not providing alternative solutions, and achieve the effects of low possibility of cracks and excellent thermal shock durability

Active Publication Date: 2020-11-03
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Korean Patent Application Publication No. 2015-0087062 discloses a polarizing plate capable of reducing the crack length during thermal shock, but does not provide an alternative that satisfies the above problems

Method used

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  • Polarizing plate and image display device including the polarizing plate
  • Polarizing plate and image display device including the polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120]

[0121] 47 parts by weight of phenoxy glycidyl ether, 3,4-epoxycyclohexylmethyl-3,50 parts by weight of epoxycyclohexyl carboxylate, photopolymerization initiator (CPI-110A, San-Apro company ) in 3 parts by weight to manufacture a photocurable resin composition. The storage elastic modulus after curing of this adhesive composition was 1500 MPa.

[0122]

[0123] After immersing a transparent and unstretched polyvinyl alcohol film (PE60, KURARAY company) with a degree of saponification of 99.9% or more in water (deionized water) at 25°C for 1 minute and 20 seconds to swell (swelling step), Dyeing was carried out by immersing for 2 minutes and 30 seconds in a 30° C. dyeing aqueous solution containing 1.25 mM / L iodine, 1.25 wt % potassium iodide, and 0.3 wt % boric acid relative to 100 wt % of water (dyeing step). At this time, in the swelling and dyeing steps, stretching was performed at stretching ratios of 1.7184 times and 1.5214 times, respectively, so that the c...

Embodiment 2～7 and comparative example 1～3

[0130] A polarizing plate was manufactured in the same manner as in Example 1 except that the elastic modulus of the protective film and the adhesive layer and the shrinkage force in the absorption axis direction of the polarizing plate were adjusted as described in Table 1 below.

[0131] The elastic modulus of the protective film is a value measured for each product.

[0132] In embodiment 5, the photopolymerization initiator (CPI-110A, San-Apro company) of embodiment 1 is changed into 4 weight parts, in embodiment 6, the photopolymerization initiator (CPI-110A, San-Apro company) of embodiment 1 is changed into -Apro company) was changed to 5 parts by weight to adjust the modulus of elasticity of the adhesive layer.

[0133] The shrinkage force in the direction of the absorption axis of the polarizing plate was adjusted by changing the boric acid content of the aqueous solution for crosslinking. The boric acid content in Table 1 refers to the boric acid content of the aqueo...

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Abstract

A polarizing plate comprising a polarizer and a polarizer protective film bonded by an adhesive layer on at least one side of the polarizer, the modulus of elasticity represented by the following mathematical formula 1 is 13.0MPa / (N / 2mm )~29.0MPa / (N / 2mm): [Mathematical formula 1] Elastic modulus = {(A+B) / C} / 100 (where, A is the 25°C tensile elastic modulus of the polarizer protective film (MPa), B is the 30°C storage elastic modulus (MPa) of the adhesive layer, and C is the shrinkage force in the absorption axis direction of the polarizing plate after standing at 80°C for 1 hour (N / 2mm)).

Description

technical field [0001] The present invention relates to a polarizing plate and an image display device including the polarizing plate, and more specifically, to a polarizing plate excellent in durability against thermal shock and an image display device including the polarizing plate. Background technique [0002] Polarizing plates used in various image display devices such as liquid crystal display (LCD), electroluminescence (EL) display, plasma display (PDP), field emission display (FED), OLED, etc. usually contain A polarizer obtained by adsorbing and aligning an iodine compound or a dichroic polarizing substance on a polyvinyl alcohol (PVA) film, and has the following multilayer structure: a polarizer protective film is sequentially laminated on one side of the polarizer , on the other side of the polarizer, a polarizer protective film, an adhesive layer bonded to other members, and a release film are sequentially laminated. [0003] The polarizing plate constituting th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30H01L51/50H05B33/02
CPCG02B5/30H05B33/02H10K50/00B32B7/12G02B5/3033
Inventor 崔允硕赵天熙金孝东朴旼奎
Owner SUMITOMO CHEM CO LTD
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