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Adhesive film for polarizing plate, polarizing plate including same, and optical display

A polarizer and adhesive technology, applied in optics, nonlinear optics, chemical instruments and methods, etc., can solve problems such as the persistent degradation of adhesive films and the shrinkage limit of polarizers

Active Publication Date: 2017-09-22
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Typical methods used to improve durability have limitations in absorbing shrinkage of polarizers
However, the reduced modulus of the adhesive film used to inhibit bending may lead to permanent degradation of the adhesive film

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0103] Preparation Example 1: Preparation of (meth)acrylic acid copolymer

[0104] Place 50 grams of ethyl acetate, 10 grams of methyl ethyl ketone, 85 grams of butyl acrylate, 3.0 grams of 2-hydroxyethyl methacrylate, 5.0 grams of phenoxyethyl acrylate, 5.0 grams in a 1-liter four-necked flask grams of N-vinylpyrrolidone and 2.0 grams of acrylic acid, the flask was then heated to 70°C and then the flask was maintained at 70°C. 0.05 g of azobisisobutyronitrile as an initiator was dissolved in 20 g of ethyl acetate and introduced into the flask. The reaction was carried out at 65°C for 3 hours, then 170 g of methyl ethyl ketone was introduced into the flask and then the flask was cooled to 40°C, thereby preparing an acrylic acid copolymer (molecular weight: 600,000 g / mol, Tg: -40°C , polydispersity index: 5.0).

preparation example 2

[0105] Preparation Example 2: Preparation of (meth)acrylic acid copolymer

[0106] Place 50 grams of ethyl acetate, 10 grams of methyl ethyl ketone, 65 grams of butyl acrylate, 3.5 grams of acrylic acid, 15 grams of phenoxyethyl acrylate, and 15 grams of N-vinylpyrrolene in a 1-liter four-necked flask Ketone, 1.5 grams of 2-hydroxyethyl methacrylate, then the flask was heated to 70°C and then the flask was maintained at 70°C. 0.08 g of azobisisobutyronitrile as an initiator was dissolved in 20 g of ethyl acetate and introduced into the flask. The reaction was carried out at 65°C for 3 hours, then 170 g of methyl ethyl ketone was introduced into the flask and then the flask was cooled to 40°C, thereby preparing an acrylic acid copolymer (molecular weight: 250,000 g / mol, Tg: -10°C , polydispersity index: 5.0).

preparation example 3

[0107] Preparation Example 3: Preparation of (meth)acrylic acid copolymer

[0108] Place 20 grams of ethyl acetate, 10 grams of methyl ethyl ketone, 90 grams of butyl acrylate, 1.5 grams of acrylic acid, 5.0 grams of phenoxyethyl acrylate, and 1.5 grams of N-vinylpyrrolene in a 1-liter four-necked flask Ketone, 2.0 grams of 2-hydroxyethyl methacrylate, then the flask was heated to 70°C and then the flask was maintained at 70°C. 0.02 g of azobisisobutyronitrile as an initiator was dissolved in 20 g of ethyl acetate and introduced into the flask. The reaction was carried out at 65°C for 3 hours, then 170 g of methyl ethyl ketone was introduced into the flask and then the flask was cooled to 40°C, thereby preparing an acrylic acid copolymer (molecular weight: 950,000 g / mol, Tg: -46°C , polydispersity index: 5.0).

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Abstract

The present invention provides an adhesive film for a polarizer, a polarizer comprising thereof, and an optical display. The adhesive film is formed by an adhesive composition containing an isocyanate crosslinker and an imide crosslinker, and the ΔG′ of the adhesive film is 50% to 80%, the ΔG′ is represented by Equation 1: [Equation 1] ΔG′ = (G1-G2) / G1×100 (G1 and G2 are the same as defined in the specification).

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2013-0147955 filed at the Korean Intellectual Property Office on Nov. 29, 2013, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to an adhesive film for a polarizing plate, a polarizing plate including the same, and an optical display. Background technique [0004] A liquid crystal display (LCD) may consist of an LCD panel including liquid crystals and a polarizing plate formed on the panel. The polarizing plate is fixed to the panel by an adhesive film for the polarizing plate. In order to stably fix the polarizing plate to the panel, the adhesive film is required to exhibit excellent durability under heat resistance or heat and humidity resistance. To improve the durability of the adhesive film, increase the degree of crosslinking of the adhesive film or use an adhesive r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/00C09J133/08C09J11/06C08F220/18C08F220/28C08F220/30C08F226/10C08F220/06G02F1/1335C09J7/10
CPCC08K5/21C08K5/29C08K5/5435B32B37/003C09J7/10B32B37/12B32B2457/202C09J133/08C09J2433/00C09J2203/318Y10T428/2891Y10T156/10C09J2301/312C09J2301/408C09K2323/057C08F220/1804C08F220/281C08F220/20C08F226/10C09J7/00C09J133/04G02B5/30G02F1/13
Inventor 郑宇镇韩仁天尹东宪
Owner SAMSUNG SDI CO LTD