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Adhesive composition for polarizing plates and polarizing plate having adhesive layer

A technology of adhesive layer and polarizer, applied in the direction of film/sheet adhesive, adhesive type, ester copolymer adhesive, etc., can solve the heat resistance and damp heat resistance of adhesive layer Insufficient, etc.

Active Publication Date: 2017-09-08
SOKEN CHEM & ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the configuration of Patent Document 1, the heat resistance, moisture resistance, etc. of the adhesive layer are not sufficient, and further improvement is desired.

Method used

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  • Adhesive composition for polarizing plates and polarizing plate having adhesive layer
  • Adhesive composition for polarizing plates and polarizing plate having adhesive layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0144] Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples. In descriptions of the following Examples and the like, "parts" means "parts by mass" unless otherwise specified.

[0145] [GPC]

[0146] About a (meth)acrylic-type copolymer, weight average molecular weight (Mw) and number average molecular weight (Mn) were calculated|required by gel permeation chromatography (GPC method) on the following conditions.

[0147] ・Measuring device: HLC-8320GPC (manufactured by Tosoh Corporation (Tosoh Corporation))

[0148] ・The composition of the GPC column: the following 4 columns (all produced by Tosoh Co., Ltd.)

[0149] (1) TSKgel HxL-H (guard column)

[0150] (2) TSKgel GMHxL

[0151] (3) TSKgel GMHxL

[0152] (4)TSKgel G2500HxL

[0153] ·Flow rate: 1.0ml / min

[0154] ·Column temperature: 40℃

[0155] ·Sample concentration: 1.5% (w / v) (diluted with tetrahydrofuran)

[0156] ·Mo...

Synthetic example 1

[0159] Add 20 parts of methyl acrylate, 0.2 parts of 2-hydroxyethyl acrylate, 3 parts of acrylic acid, 76.8 parts of n-butyl acrylate, and 0.045 parts of n-dodecane into a reaction device equipped with a stirrer, reflux cooler, thermometer and nitrogen gas introduction tube mercaptan and 100 parts of ethyl acetate as a solvent, and the temperature was raised to 65° C. while introducing nitrogen gas. Then, 0.1 part of 2,2'-azobisisobutyronitrile was added, and the polymerization reaction was performed at 65 degreeC in nitrogen atmosphere for 4 hours. After completion of the reaction, it was diluted with ethyl acetate to obtain a polymer solution having a solid content concentration of 30% by mass. The obtained (meth)acrylic copolymer A1 had a weight average molecular weight (Mw) of 520,000, and a molecular weight distribution (Mw / Mn) of 2.4.

Synthetic example 2～8

[0161] Except for changing the monomer components used in the polymerization reaction to those described in Table 1, synthesis was carried out in the same manner as in Synthesis Example 1 to obtain a polymer solution having a solid content concentration of 30% by mass. The results are shown in Table 1.

[0162] [Table 1]

[0163]

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Abstract

To provide an adhesive composition for polarizing plates, suitable for configurations whereby at least one polarizer protective film normally formed on both surfaces of a polarizer is omitted and whereby an adhesive layer can be formed that has excellent durability. An adhesive composition for polarizing plates, containing: a (meth) acrylic copolymer (A) having a weight-average molecular weight as measured by gel permeation chromatography of no more than 600,000, having a glass transition temperature of -80-0 DEG C, and being obtained by copolymerization of monomer components including 10%-30% by mass of a (meth) acrylate alkyl ester (a1) having a homopolymer glass transition temperature of at least 0 DEG C and 0.1%-5% by mass of a crosslinking functional group-containing monomer (a2) containing a hydroxyl group-containing monomer and a carboxyl group-containing monomer; and an isocyanate-based crosslinking agent (B). The adhesive composition for polarizing plates is characterized by: containing 10-40 parts by mass isocyanate-based crosslinking agent (B) relative to 100 parts by mass copolymer (A); and by being used to form an adhesive layer that comes in direct contact with polarizers.

Description

technical field [0001] The present invention relates to an adhesive composition for a polarizing plate, a polarizing plate with an adhesive layer, and the like. Background technique [0002] The liquid crystal unit cell has a structure in which the liquid crystal layer is sandwiched by two substrates (for example: glass plates). A polarizing plate is stuck on the surface of the substrate constituting the liquid crystal cell through an adhesive layer. Conventionally, in order to improve the mechanical properties and optical durability of polarizers, a polarizing element protective film such as triacetyl cellulose is laminated on both sides of a polarizing element having polarizing performance. [0003] In recent years, thinning of the liquid crystal cell and thinning of the polarizing plate have been desired, and in response to the request for thinning the polarizing plate, attempts have been made to omit the polarizing element protective films formed on both surfaces of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B27/00C09J7/00C09J7/02C09J133/06C09J175/04C09J7/10
CPCB32B27/00C09J133/06C09J175/04G02B5/30C09J7/20C09J7/10C09J7/29B32B27/30G02F1/1335C09J2203/318
Inventor 米川雄也田中隆祐
Owner SOKEN CHEM & ENG CO LTD