Polarizing plate and image display device comprising same

A polarizer and polarizer technology, applied in the field of polarizers, can solve the problems of image display device visibility deterioration, in-plane phase difference, refractive index difference, etc.

Pending Publication Date: 2020-05-29
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, such a polyester-based film has a disadvantage in that an aromatic ring having a high refractive index is contained in its structure, and refraction occurs due to a difference between stretching ratios in MD / TD directions, etc., during film production. rate difference (in-plane birefringence) and in-plane phase difference
As a result, when a polyester-based film is used as a base film for a polarizer protective film, a rainbow phenomenon may occur due to light transmission / reflection, thereby deteriorating the visibility of an image display device

Method used

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  • Polarizing plate and image display device comprising same

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0092] Synthesis Example 1: Synthesis of Polymodified Urethane Acrylate

[0093] As a polyvalent isocyanate-based compound having three or more functional groups, HDI-based trimer DN980S manufactured by Aekyung Chemical Co., Ltd. was used; as polyethylene glycol-modified (meth)acrylate For the class of compounds, polyethylene glycol monoacrylate (Mn=300) and polyethylene glycol monoacrylate (Mn=500) having different numbers of polyethylene glycol repeating units and thus different number average molecular weights were used, respectively.

[0094] 40 g of polyvalent isocyanate-based compounds, 30 g of polyethylene glycol monoacrylate (Mn=300) and 30 g of polyethylene glycol monoacrylate (Mn=500) were mixed with 0.1 g of DBTDL (dibutyltin dilaurate) and 200 g of formazan Ethyl ketone was mixed, and the mixture was stirred at 60° C. for 5 hours to perform a carbamate reaction. By completing the urethane reaction, the polyethylene glycol-modified polyfunctional urethane (meth)acr...

Synthetic example 2

[0096] Synthesis Example 2: Synthesis of High Molecular Weight Copolymer

[0097] A high molecular weight copolymer (PMMA-PBA block copolymer) was prepared by reversible addition-fragmentation chain transfer polymerization (RAFT polymerization) of polymethyl methacrylate (PMMA) and poly(butyl acrylate) (PBA). Herein, the volume ratio of PMMA to PBA is about 1:1, and the number average molecular weight is about 30000 g / mol. In addition, the average particle diameter of the micellar structure formed by the self-assembly of the PMMA-PBA block copolymer was about 15 nm.

preparation example 1

[0098] Preparation Example 1: Preparation of Coating Solution (A) for Forming the First Hard Coat

[0099] The polymodified urethane acrylate prepared in 38.74g trimethylpropyl triacrylate (TMPTA), 30.99g synthetic example 1, the high molecular weight copolymer prepared in 7.75g synthetic example 2, 2.31g TPO (with Initiator for photocuring, manufactured by Ciba Company), 0.21 g of T270 (leveling agent manufactured by Tego Inc.), and solvent 13.33 g of ethyl methyl ketone (MEK) and 6.67 g of methyl isobutyl ketone were mixed to A coating solution (A) for forming the first hard coat layer was prepared.

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Abstract

The present invention relates to a polarizing plate and a display device, the polarizing plate comprising: a polarizer; a first hard coating layer positioned on the polarizer and containing a binder resin comprising (meth)acrylate-based (co)polymer; a light transmissive base material positioned on the first hard coating layer, having a retardation of 3,000 nm or more and having an in-plane birefringence; and a second hard coating layer positioned on the light transmissive base material and comprising a binder resin and solid inorganic nano particles dispersed in the binder resin, wherein the angle formed by a slow axis of the light transmissive base material and an absorption axis of the polarizer is 5 to 85 degrees.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims Korean Patent Application No. 10-2018-0026390 filed with the Korean Intellectual Property Office on March 6, 2018 and Korean Patent Application No. 10-2019-0025662 filed with the Korean Intellectual Property Office on March 6, 2019 Interest, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a polarizing plate constituting an image display device and an image display device including the polarizing plate. Background technique [0004] Recently, with the development of mobile devices such as smartphones, tablet PCs, etc., substrates for displays are required to be slim. As a material for a window or a front panel of a display of such a mobile device, glass or tempered glass having excellent mechanical properties such as tensile strength and excellent impact absorption to external impact is generally used. Howe...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G02B5/30B05D7/24B05D7/02
CPCB05D7/02B05D7/24G02B1/14G02B5/3083G02B5/3025B05D2601/00G02F1/133531G02F1/133638G02B5/305C09K2323/035
Inventor徐姃贤洪敬奇张影来朴真荣
OwnerLG CHEM LTD