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Adhesive for polarizing plate, polarizing plate including adhesive layer, and liquid crystal display

An adhesive layer, liquid crystal display panel technology, applied in the directions of non-polymer adhesive additives, adhesive types, adhesive additives, etc., can solve the problem of low water vapor transmission rate, micro-bubble and durability deterioration, etc. question

Inactive Publication Date: 2014-07-09
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since films other than TAC films show a low water vapor transmission rate, when placed at high temperatures, including polarizing plates bonded with such films using conventional adhesives for TAC films, microbubbles can be generated. and deterioration of durability

Method used

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  • Adhesive for polarizing plate, polarizing plate including adhesive layer, and liquid crystal display
  • Adhesive for polarizing plate, polarizing plate including adhesive layer, and liquid crystal display
  • Adhesive for polarizing plate, polarizing plate including adhesive layer, and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] 100 parts by weight of (A1) (meth)acrylic acid copolymer, 0.5 parts by weight of (B1) curing agent and 0.16 parts by weight of (B2) curing agent were introduced into 20 parts by weight of methyl ethyl ketone, followed by stirring at 25°C 5 minutes. 0.35 parts by weight of a silane coupling agent was added to the mixture, followed by stirring at 25° C. for 5 minutes, thereby preparing an adhesive for a polarizing plate.

Embodiment 2 to 4 and comparative example 1

[0102] An adhesive for a polarizing plate was prepared in the same manner as in Example 1, except that a curing agent was added in the amount listed in Table 1 (unit: parts by weight based on solid content). The minimum storage modulus of the adhesive layer was obtained by measuring each prepared adhesive by the method described below.

[0103] Table 1

[0104]

experiment example

[0105] Experimental Example: Property Evaluation of Adhesives for Polarizing Plates

[0106] The following properties of the adhesives for polarizing plates prepared in Examples and Comparative Examples were evaluated. The results are shown in Tables 2 and 3.

[0107] Methods of property evaluation

[0108] (1) Storage modulus (Pa): Each prepared adhesive for polarizing plates is coated on a polyethylene terephthalate release film, followed by drying at 90° C. for 4 minutes, thereby An adhesive sheet having a 20 μm thick adhesive layer was prepared. The adhesive layer was left at 35° C. and 45% RH for 3 days to cure the adhesive layer. Several cured adhesive layers were stacked on each other to form a 1 mm thick adhesive sheet, which was then cut into circular samples with a diameter of 8 mm. by at 85°C and about 10 -3 rad / s to about 10 2 The frequency sweep test was carried out at a frequency of rad / s, and the storage modulus of the sample was measured using a storage...

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PUM

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Abstract

Disclosed are an adhesive for polarizing plates, a polarizing plate including an adhesive layer, and a liquid crystal display. The adhesive includes a (meth)acrylic copolymer, a curing agent, and a silane coupling agent, wherein the (meth)acrylic copolymer has an average molecular weight of at least 800,000 g / mol. The adhesive has a storage modulus ranging from approximately 8,000 Pa or more to less than approximately 27,000 Pa at 85 DEG C. and at a frequency ranging from 10-3 rad / s to 102 rad / s after curing, and is configured to bond a protective film having a water vapor transmission rate (WVTR) of approximately 100 g / m2 / day or less at 40 DEG C. and 90% RH. The polarizing plate includes a polarizer, a first protective film on a top surface of the polarizer, a second protective film on a bottom surface of the polarizer, and an adhesive layer on a bottom surface of the second protective film.

Description

technical field [0001] The present invention relates to an adhesive for a polarizing plate, a polarizing plate including an adhesive layer formed of the adhesive, and a liquid crystal display including the polarizing plate. Background technique [0002] The polarizing plate is used to control the oscillation direction of light inside and outside the liquid crystal cell to reveal the display pattern of the liquid crystal display. Although in the early stages of development, liquid crystal displays were used in small devices, but recently, liquid crystal displays are used in a wide range of applications, including notebook computers, liquid crystal monitors, liquid crystal color projectors, liquid crystal televisions, car navigation systems, portable phones, indoor / Measuring instruments for outdoor use, etc. [0003] Generally, a polarizing plate includes a polarizer and protective films stacked on both sides of the polarizer. A triacetyl cellulose (TAC) film has been used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J133/10C09J11/06C09J7/02G02B5/30G02F1/1335
CPCC09J133/066G02F1/133528G02F2202/28C08L2312/08Y10T428/2848C09K2323/059C09J133/04C09J7/22C09J11/06G02B5/30G02F1/1335C09J2203/318C09J133/00
Inventor 郑丽娜韩仁天
Owner CHEIL IND INC