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Optical film adhesive, adhesive layer, optical member, and image display apparatus

A technology for optical components and optical films, applied in adhesive types, ester copolymer adhesives, adhesives, etc., can solve problems such as durability test shrinkage

Active Publication Date: 2021-09-10
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unlike typical double-sided protected polarizers, one-sided protected polarizers shrink significantly in durability tests, especially thermal durability tests or thermal shock cycle tests

Method used

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  • Optical film adhesive, adhesive layer, optical member, and image display apparatus
  • Optical film adhesive, adhesive layer, optical member, and image display apparatus
  • Optical film adhesive, adhesive layer, optical member, and image display apparatus

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0299] [Preparation Example 1: Preparation of a solution of (meth)acrylate copolymer (A1)]

[0300] Into a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen inlet pipe and a cooler, 50 parts by weight of n-butyl acrylate (Nippon Shokubai Co., Ltd.), 29 parts by weight of 2-ethylhexyl acrylate (Osaka Organic Chemical Industry Co., Ltd.), 10 parts by weight of methyl acrylate (Nippon Shokubai Co., Ltd.) and 2-ethylhexyl diglycol acrylate (Kyoeisha Chemical Co., Ltd.), 1 part by weight of acrylic acid 4 - Hydroxybutyl ester (Osaka Organic Chemical Industry Co., Ltd.) and 0.1 parts by weight of 2,2'-azobisisobutyronitrile (Wako Junyaku Kogyo Co., Ltd.) as a polymerization initiator and 100 parts by weight of acetic acid Ethyl ester, then gently stir the components while introducing nitrogen into the flask. After purging with nitrogen, the temperature of the liquid in the flask was raised to reflux of ethyl acetate, followed by polymerization for 5 hours ...

preparation example 1 to 15

[0301] [Preparation Examples 1 to 15: Preparation of Solutions of (Meth)acrylate Copolymers (A2) to (A15)]

[0302] (Meth)acrylic acid was prepared in the same manner as in Preparation Example 1, except that the monomer types and mixing ratios of each (meth)acrylate were changed as listed in Table 1 and the amount of polymerization initiator and reaction time were appropriately changed. Solutions of Ester Copolymers (A2) to (A15). Table 1 shows the measurement results of glass transition temperature (Tg), weight average molecular weight (Mw) and dispersion index (Mw / Mn) of each (meth)acrylate copolymer (A2) to (A15). In Table 1, a blank indicates that no monomer was used.

[0303] Table 1

[0304]

[0305] Note) BA: n-butyl acrylate (Nippon Shokubai Co., Ltd., Tg in homopolymer phase: -45°C)

[0306] 2EHA: 2-ethylhexyl acrylate (Nippon Shokubai Co., Ltd., Tg in homopolymer phase: -68°C)

[0307] MEA: 2-methoxyethyl acrylate (Nippon Shokubai Co., Ltd., Tg in homopolymer ...

Embodiment 1

[0315] [Preparation of adhesives for optical films]

[0316] While stirring, 100 parts by weight of the solid (meth)acrylate copolymer A1 solution obtained in Preparation Example 1 (ie 100 parts by weight of (meth)acrylate (A1)) and 0.1 parts by weight as a crosslinking agent B's D-110N (75% ethyl acetate solution of trimethylolpropane adduct of xylene diisocyanate) (Mitsui Kagaku Co., Ltd., number of isocyanate groups per molecule: 3) and 0.1 parts by weight as silane KBM-403 (3-glycidoxypropyltrimethoxysilane) (Shin-Etsu Kagaku Kogyo Co., Ltd.) of the coupling agent (C) was mixed, thereby preparing an adhesive for an optical film (Solid content: 25% by weight).

[0317] [Formation of adhesive layer]

[0318] The obtained adhesive for optical films was coated onto a 38 μm thick silicone-treated polyethylene terephthalate (PET) film (MRF38, Mitsubishi Chemical Co., Ltd., oligomer-free on one surface of the object prevention layer) so that the adhesive layer has a thicknes...

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Abstract

The present invention provides an optical film adhesive which can have improved durability under severe conditions (high temperature, high humidity and heat shock) and, simultaneously, inhibits bending and scratching on both sides even when used in a one-side protected polarizing plate, and which also has excellent reworkability (processability). The adhesive for an optical film comprises (A) a (meth)acrylic ester copolymer, the (meth)acrylic ester copolymer (A) comprises: (a1) approximately 10-95 wt% of a unit derived from an (meth)acrylic acid alkyl ester monomer; (a2) approximately 5-90 wt% of a unit derived from an (meth)acrylic acid alkyl ester monomer having an alkoxyalkyl group or an alkoxyalkylene glycol group; and (a3) a unit derived from a functional group-containing monomer, which is a (meth)acrylic acid derivative monomer having one radical polymerizable functional group, in an amount of more than approximately 0 wt% and less than approximately 5 wt% (wherein the sum of the amounts of the units (a1), (a2) and (a3) is 100 wt%), and the (meth)acrylic acid ester copolymer (A) has a glass transition temperature of higher than approximately -55 DEG C and lower than or equal to approximately -50 DEG C, and a weight average molecular weight of approximately 700,000-2,000,000.

Description

technical field [0001] The present invention relates to an adhesive for optical films. Furthermore, the present invention relates to an adhesive film formed from an adhesive for an optical film, an optical film including an adhesive layer, and an image display device including the optical film. Background technique [0002] Currently, flat display panels, such as liquid crystal display panels (LCD) and plasma display panels (PDP), are mainly used as display panels. In general, a laminate in which a plurality of films are stacked is bonded to the surface of a flat display panel. For example, in LCDs, optical films such as polarizing plates, retardation plates, viewing angle enlargement films, and brightness enhancement films are stacked on the surface of a liquid crystal panel. In addition, each layer constituting the flat display panel may be bonded to another layer through an adhesive layer formed of various adhesives. [0003] In recent years, cheaper and thinner polari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J11/00C08L67/00G02B5/30C08K5/5415C08L83/06
CPCC09J133/04C09J11/00C08L67/00G02B5/30C08K5/5415C08L83/06C09J2301/312
Inventor 乾州弘
Owner SAMSUNG SDI CO LTD