Acrylic adhesive composition, adhesive using the acrylic adhesive composition, adhesive for polarizing plates, and image display device
An acrylic and acrylic resin technology, applied in non-polymer adhesive additives, adhesives, adhesive types, etc., can solve the problems of whitening of the adhesive layer, decreased adhesion, and low moisture permeability of COP films
Active Publication Date: 2021-09-14
MITSUBISHI CHEM CORP
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
When such a COP film is used, the heat and humidity resistance of the polarizing plate is improved, but when the liquid crystal display device obtained by bonding the polarizing plate to the liquid crystal cell through an adhesive is exposed to a hot and humid environment, the adhesive layer will easily develop. The problem of bleaching
[0005] The reason is that if placed under hot and humid conditions for a long time, moisture will slowly penetrate into the adhesive layer, and when it returns to normal temperature, the moisture will condense in the adhesive layer, but the moisture permeability of the COP film is low, inhibiting release of moisture in the adhesive layer
[0006] In addition, durability such as heat resistance and heat and humidity resistance is required for the adhesive for laminating the polarizing plate and the liquid crystal cell. However, especially in a hot and humid environment, moisture will penetrate into the adhesive layer, and the bond between the glass substrate and the glass substrate will be damaged. Since the adhesiveness is lowered, there is a problem that the polarizing plate partially floats or peels off from the glass substrate. In order to improve the adhesiveness between the glass substrate and the adhesive layer, it is generally known to contain a silane coupling agent.
Method used
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Embodiment 1～5、 comparative example 1～5
[0193] The above-mentioned components (A) to (D) were mixed according to Table 2 below, and the solid content concentration was adjusted to 12.5% with ethyl acetate to obtain an acrylic adhesive composition.
[0194] [Table 2]
[0195]
[0196] Remarks) The values in parentheses are parts by weight of compounding in terms of solid content.
[0197] Using the acrylic adhesive composition obtained above, samples for evaluation were produced as shown below, and the following performances were evaluated. The evaluation results are shown in Table 3.
[0198] [Preparation of samples for evaluation]
[0199] The acrylic adhesive composition obtained above was coated on a release sheet with a thickness of 38 μm (“Lumirror SP-0138BU” manufactured by Mitsui Chemicals TOHCELLO Co., Ltd.), and dried at 100° C. for 3 minutes so that the thickness after drying became 25 μm. A polarizing plate consisting of the following two structures is attached to the adhesive layer on the oppos...
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Abstract
The present invention provides an adhesive composition which, when used as an adhesive for a polarizing plate for bonding a polarizing plate to a glass substrate, etc., can achieve moisture-heat whitening resistance, excellent initial durability, and storage stability (time-lapse) Durability) is also an excellent adhesive layer. The acrylic adhesive composition is characterized in that it contains an acrylic resin (A) and a silane coupling agent (B) each containing one or more reactive functional groups and an alkoxy group in its structure, and the acrylic resin (A) is an acrylic resin containing 5 to 50% by weight of a structural unit derived from a polar group-containing monomer (a1) selected from hydroxyl group-containing monomers At least one of a monomer, a carboxyl group-containing monomer, and a nitrogen-containing monomer, and at least one of the alkoxy groups contained in the silane coupling agent (B) is an alkoxy group having 2 to 8 carbon atoms.
Description
technical field [0001] The present invention relates to an acrylic adhesive composition, an adhesive using the acrylic adhesive composition, and an adhesive for polarizing plates, and more specifically, a moisture-resistant An acrylic adhesive composition of an adhesive excellent in whitening properties and storage stability of the adhesive layer. Background technique [0002] Conventionally, a polarizing plate is obtained by covering both sides of a polarizing plate made of a polarized polyvinyl alcohol-based film or the like with a protective film, and the polarizing plate is stacked between two glass plates in a liquid crystal cell in which an aligned liquid crystal component is sandwiched surface to manufacture an image display device. Lamination of the polarizing plate on the surface of the liquid crystal cell is usually carried out by bringing the adhesive layer provided on the surface of the polarizing plate into contact with the surface of the liquid crystal cell an...
Claims
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IPC IPC(8): C09J133/00C09J11/06C09J133/14G02B5/30
CPCC09J11/06C09J133/00C09J133/14G02B5/30C09J133/16G02F2202/28
Inventor 三谷直也今泉早织三谷圣子秋月伸介
Owner MITSUBISHI CHEM CORP