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Resin composition for protecting polarizer, and polarizing plate including protective layer formed from said composition

A resin composition and polarizing plate technology, applied in the field of polarizing plates, can solve the problems of reduced durability, inability to properly protect polarizers, etc., and achieve the effects of excellent adhesion and prevention of discoloration

Pending Publication Date: 2021-10-01
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the thickness of the protective layer is thin, the durability may decrease and the polarizer may not be properly protected.

Method used

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  • Resin composition for protecting polarizer, and polarizing plate including protective layer formed from said composition
  • Resin composition for protecting polarizer, and polarizing plate including protective layer formed from said composition
  • Resin composition for protecting polarizer, and polarizing plate including protective layer formed from said composition

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Experimental program
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Effect test

preparation example Construction

[0068] A-2. Preparation method of resin composition for polarizer protection

[0069] In one embodiment, the resin composition for protecting polarizers of the present invention is a polymerization solution obtained by solution-polymerizing monomers and comonomers. In another embodiment of the present invention, it can be obtained by mixing the above-mentioned polymer with an arbitrary and appropriate solvent by an arbitrary and appropriate method. As a solvent, the solvent used for the above-mentioned solution polymerization can be used, and other solvents can also be used. As the solvent, ethyl acetate, toluene, methyl ethyl ketone, and cyclopentanone are preferably used. These solvents may be used alone or in combination of two or more.

[0070] In addition, the resin composition for polarizer protection may further contain arbitrary and appropriate additives in addition to the above-mentioned polymer and solvent as needed. Additives may be used alone or in combination o...

manufacture example 1

[0123] [Manufacturing example 1] Production of polarizer 1

[0124] As a thermoplastic resin substrate, an amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyethylene PET) film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75° C. was used. Corona treatment is performed on one side of the substrate, and the corona-treated surface is coated with polyvinyl alcohol (polymerization degree: 4200, saponification degree: 99.2 mol%) and acetoacetyl group at a ratio of 9:1 at 25°C. Aqueous solution of modified PVA (polymerization degree 1200, acetoacetyl group modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200"), and dried to form a thickness A PVA-based resin layer of 5 μm was used to produce a laminate.

[0125] Using a tenter stretcher, the obtained laminate was stretched 4.5 times in air at 140° C. in a direction perpendicular to the lo...

manufacture example 2

[0131] [Manufacturing example 2] Production of polarizer 2

[0132] As the substrate, a long amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyethylene PET) film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of 75° C. was used. Corona treatment is performed on one side of the substrate, and the corona-treated surface is coated with polyvinyl alcohol (polymerization degree: 4200, saponification degree: 99.2 mol%) and acetoacetyl group at a ratio of 9:1 at 25°C. Aqueous solution of modified PVA (polymerization degree 1200, acetoacetyl group modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMERZ200"), and dried to form a thickness of 11 μm The PVA-based resin layer is used to make a laminate.

[0133] The obtained laminate was uniaxially stretched to 2.0 times in the longitudinal direction (longitudinal direction) between rolls having differen...

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Abstract

The purpose of the present invention is to provide: a resin composition for protecting a polarizer, which exhibits excellent adhesion to a polarizer and can prevent defects such as color voids from an edge part; and a polarizing plate including a protective layer that contains the resin composition. This resin composition for protecting a polarizer contains a polymer obtained by polymerizing more than 50 parts by weight of an acrylic monomer and more than 0 parts by weight but less than 50 parts by weight of a copolymerization monomer represented by formula (1). The glass transition temperature of the polymer is 50 DEG C or higher. [Formula 1] (In the formula, X denotes a functional group that includes at least one type of reactive group selected from the group consisting of a vinyl group, a (meth)acrylic group, a styryl group, a (meth)acrylamide group, a vinyl ether group, an epoxy group, an oxetane group, a hydroxyl group, an amino group, an aldehyde group and a carboxyl group. R1 and R2 each independently denote a hydrogen atom, an aliphatic hydrocarbon group that may have a substituent group, an aryl group that may have a substituent group and a heterocyclic group that may have a substituent group. R1 and R2 may bond to each other to form a ring).

Description

technical field [0001] The present invention relates to a resin composition for protecting a polarizer and a polarizing plate provided with a protective layer formed from the composition. Background technique [0002] Typically, a polarizer is produced by dyeing a polyvinyl alcohol (PVA)-based resin film with a dichroic substance such as iodine (for example, Patent Documents 1 and 2). It is known that the iodine complex is destroyed due to moisture absorption of the polarizer in a hot and humid environment, and the degree of polarization decreases and the transmittance increases (discoloration) due to elution of iodine. Since moisture intrudes from the edge of the polarizing plate, discoloration of the edge of the polarizer tends to become conspicuous. [0003] Typically, the polarizer is used as a polarizing plate including a polarizer and protective layers provided on both sides of the polarizer. In recent years, thinning of polarizers and protective layers, and polarizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08F220/10
CPCG02B5/30C08F220/10C08F230/06C09D133/10C09D143/00G02B1/14G02B5/3033
Inventor 姜太艳长瀬纯一三田聪司泽田浩明中西贞裕池田哲朗
Owner NITTO DENKO CORP
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