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Adhesive film for polarizing plate, polarizing plate and optical display

An adhesive film, polarizing plate technology, applied in the direction of film/sheet adhesive, adhesive type, ester copolymer adhesive, etc., can solve the problems of light leakage of polarizing plate, deterioration of polarizing plate durability, etc.

Active Publication Date: 2014-12-24
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the content of the crosslinking agent is reduced, although good durability is produced due to low crosslinking, the polarizing plate suffers from severe light leakage, and if the content of the crosslinking agent is increased, the durability of the polarizing plate may be deteriorated although the light leakage is suppressed

Method used

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  • Adhesive film for polarizing plate, polarizing plate and optical display
  • Adhesive film for polarizing plate, polarizing plate and optical display
  • Adhesive film for polarizing plate, polarizing plate and optical display

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0085] In a 1L reactor with a thermometer, a reflux condenser and a stirrer, 97 parts by weight of n-butyl acrylate and a solvent (40 parts by weight of ethyl acetate and 45 parts by weight of methyl ethyl ketone) were placed, followed by heating at 65°C Nitrogen replacement was performed for 30 minutes. Next, 0.06 parts by weight of 2,2'-azobisisobutyronitrile as an initiator was diluted with 2 parts by weight of ethyl acetate, and then added to the reactor. Next, 2 parts by weight of acrylic acid and 1 part by weight of 2-hydroxyethyl methacrylate were dropped into the reactor, followed by reaction for 6 hours while the temperature of the reactor was maintained at 65°C. Next, the reactor was heated to 70° C., thereby performing a reaction for 2 hours. After the reaction was completed, the resulting mixture was diluted with 130 parts by weight of ethyl acetate, thereby obtaining an acrylic copolymer having a weight average molecular weight of 900,000 g / mol.

preparation example 2

[0087]In a 1 L reactor equipped with a thermometer, a reflux condenser, and a stirrer, 97 parts by weight of n-butyl acrylate and 85 parts by weight of ethyl acetate as a solvent were placed, followed by nitrogen substitution at 65° C. for 30 minutes. Next, 0.04 parts by weight of 2,2'-azobisisobutyronitrile as an initiator was diluted with 2 parts by weight of ethyl acetate, and then put into the reactor. Next, 2 parts by weight of acrylic acid and 1 part by weight of 2-hydroxyethyl methacrylate were dropped into the reactor, followed by reaction for 6 hours while the temperature of the reactor was maintained at 65°C. Next, the reactor was heated to 70° C., thereby performing a reaction for 2 hours. After the reaction was completed, the resulting mixture was diluted with 130 parts by weight of ethyl acetate, thereby obtaining an acrylic copolymer having a weight average molecular weight of 1,100,000 g / mol.

preparation example 3

[0089] In a 1L reactor with a thermometer, reflux condenser and stirrer, place 97 parts by weight of n-butyl acrylate, 2 parts by weight of acrylic acid, 1 part by weight of 2-hydroxyethyl methacrylate and 60 parts by weight of ethyl acetate and 25 parts by weight of methyl ethyl ketone as a solvent, followed by nitrogen replacement at 65° C. for 30 minutes. Next, 0.04 parts by weight of 2,2'-azobisisobutyronitrile as an initiator was diluted with 2 parts by weight of ethyl acetate, and then placed in a reactor. Next, the reaction was performed for 6 hours while the temperature of the reactor was maintained at 65° C., and then the reactor was heated to 70° C., thereby performing the reaction for 2 hours. After the reaction was completed, the resulting mixture was diluted with 130 parts by weight of ethyl acetate, thereby obtaining an acrylic copolymer having a weight average molecular weight of 1,000,000 g / mol.

[0090] The retention times of the acrylic copolymers of Prepara...

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Abstract

An adhesive film for a polarizing plate is disclosed. The adhesive film includes a cured product of a composition including a (meth)acrylic copolymer and a cross-linking agent, and has a peel strength ratio of about 6 or more, as represented by Equation 1. An adhesive composition for the adhesive film, a polarizing plate including the adhesive film, and an optical display including the adhesive film are also described.

Description

technical field [0001] The present application relates to an adhesive film for a polarizing plate, a polarizing plate including it, and an optical display including it. Background technique [0002] Polarizing plates are provided on upper and lower sides of a liquid crystal display (LCD) panel and may be bonded to the LCD panel by an adhesive film for the polarizing plate. The polarizing plate shrinks or expands under severe conditions of high temperature (for example, 85° C.) and high humidity. Here, if the adhesive film for the polarizing plate exhibits poor durability, the polarizing plate is peeled off from the LCD panel and thus suffers from failures such as detachment, blistering, etc. Dimensional variation differences between films can also cause light leakage. Therefore, the adhesive film requires high durability and performance of suppressing light leakage by controlling or alleviating stress due to shrinkage or expansion of the polarizing plate. In addition, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J133/08C09J11/06C09J11/08G02B5/30C09J7/10
CPCG02B5/3033C09J2203/318C09J133/066C08L2314/00C09J7/10C09J2433/00C09J2301/312C09J133/08
Inventor 金易宇金源徐有珍李承俊韩仁天
Owner CHEIL IND INC
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