Adhesive agent composition for optical films, adhesive agent layer for optical films, optical film having adhesive agent layer attached thereto, and image display device
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A technology of adhesive layer and optical film, which is applied in the direction of film/sheet adhesive, non-polymer adhesive additive, polyether adhesive, etc., which can solve defects, influence of liquid crystal orientation, uneven display, etc. problems, achieve the effect of achieving durability, suppressing peeling, and stabilizing durability
Active Publication Date: 2016-11-16
NITTO DENKO CORP
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The static electricity generated in this way affects the orientation of the liquid crystal inside the liquid crystal display device, causing defects.
In addition, when the liquid crystal display device is used, display unevenness due to static electricity may occur.
Method used
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Embodiment 1
[0183] (Preparation of Acrylic Polymer (A1))
[0184] 74.8 parts of butyl acrylate, 23 parts of phenoxyethyl acrylate, 1.5 parts of N-vinyl-2-pyrrolidone, 0.3 parts of acrylic acid, A monomer mixture of 0.4 parts of 4-hydroxybutyl acrylate. In addition, 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator was added to 100 parts of the above-mentioned monomer mixture (solid content) together with 100 parts of ethyl acetate, and nitrogen gas was introduced while slowly stirring. After nitrogen substitution, the liquid temperature in the flask was kept at around 55° C. and polymerization was performed for 8 hours to prepare a solution of an acrylic polymer (A1) with a weight average molecular weight (Mw) of 1.6 million and Mw / Mn=3.7.
[0185] (Preparation of Adhesive Composition)
[0186] With respect to 100 parts of solid content of the solution of the acrylic polymer (A1) obtained in Production Example 1, an isocyanate crosslinking agent (TAKENATE D160N, trim...
Embodiment 2～29、 comparative example 1～13
[0190] In embodiment 1, as shown in table 1, change the kind of monomer used in the preparation of acrylic polymer (A), its use ratio, control manufacturing conditions in addition, prepared the polymkeric substance character described in table 1 ( Weight average molecular weight, Mw / Mn) of acrylic polymer solution.
[0191]In addition, for each obtained solution of the acrylic polymer, in addition to changing the type or amount of the crosslinking agent (B) as shown in Table 1, the type or amount of the silane coupling agent (C) or the amount used (or not Except using ), it carried out similarly to Example 1, and prepared the solution of the acrylic adhesive composition. Moreover, the polarizing plate with an adhesive layer was produced similarly to Example 1 using the solution of this acrylic adhesive composition. It should be noted that, in Examples 24 to 26, 28 and Comparative Example 5, a solution of an acrylic polymer containing an ionic compound (D) in the ratio shown i...
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Abstract
An adhesive agent composition for optical films, which comprises: a (meth)acrylic polymer (A) that contains, as monomer units, 70% by weight or more of an alkyl (meth)acrylate (a1), 3 to 25% by weight of an aromatic-ring-containing (meth)acrylate (a2), 0.1 to 8% by weight of an amide-group-containing monomer (a3), 0.01 to 2% by weight of a carboxyl-group-containing monomer (a4) and 0.01 to 3% by weight of a hydroxyl-group-containing monomer (a5) and meets such requirements that the weight average molecular weight (Mw) is 1,000,000 to 2,500,000 and the Mw / (number average molecular weight (Mn)) ratio is 1.8 to 10 inclusive; and a cross-linking agent (B) in an amount of 0.01 to 3 parts by weight relative to 100 parts by weight of the (meth)acrylic polymer (A). The adhesive agent composition can be formed into an adhesive agent layer which satisfies durability to such an extent that the adhesive agent layer does not undergo foaming, is not detached or does not get clouded under humidified conditions when applied onto a glass or a transparent conductive layer, and which can prevent the occurrence of display unevenness due to leakage of light, and which has excellent metal corrosion resistance.
Description
technical field [0001] The present invention relates to an adhesive composition for optical films and an optical film with an adhesive layer in which an adhesive layer is formed on at least one side of an optical film using the adhesive composition. Furthermore, the present invention relates to image display devices such as liquid crystal display devices, organic EL display devices, and PDPs using the above-mentioned optical film with an adhesive layer. As the above-mentioned optical film, a polarizing film, a retardation film, an optical compensation film, a brightness enhancement film, and an optical film in which these films are laminated can be used. Background technique [0002] In liquid crystal display devices and the like, polarizing elements must be provided on both sides of the liquid crystal cell due to the image forming method thereof, and generally a polarizing film is bonded thereto. Also, in liquid crystal panels, various optical elements have begun to be use...
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