KR-20260066050-A - adhesive sheet

Abstract

The adhesive sheet (10) contains a base polymer and a metal complex black dye. The acid value of the base polymer is 50 mgKOH/g or less.

Inventors

• 미즈노 다이스케
• 야마모토 신야

Assignees

• 닛토덴코 가부시키가이샤

Dates

Publication Date

20260512

Application Date

20240808

Priority Date

20230908

Claims (7)

1. A base polymer with an acid value of 50 mgKOH/g or less, and Adhesive sheet containing metal complex black dye.
2. In paragraph 1, An adhesive sheet in which the above-mentioned metal complex black dye comprises at least one metal selected from the group consisting of chromium and copper.
3. In paragraph 1, An adhesive sheet in which the above-mentioned metal complex black dye comprises an azo dye compound as a dye compound.
4. In paragraph 3, An adhesive sheet in which the above azo dye compound is an aromatic azo dye compound.
5. In paragraph 1, An adhesive sheet in which the above metal complex black dye has a molecular weight of 400 or more.
6. In paragraph 1, An adhesive sheet having a b * value of the transmitted color in the L * a * b * color system that is 0 or less.
7. In any one of paragraphs 1 through 6, Adhesive sheet with haze of 3.0% or less.

Description

adhesive sheet The present invention relates to an adhesive sheet. In the manufacturing process of display panels such as organic EL panels, an adhesive sheet is used as a bonding material between components. As such an adhesive sheet, a black adhesive sheet incorporating a black pigment is known for its aesthetic appeal, light-blocking properties, or anti-reflective properties. Such an adhesive sheet is described, for example, in Patent Document 1 below. FIG. 1 is a schematic cross-sectional view of one embodiment of the adhesive sheet of the present invention. FIG. 2 shows an example of a method for manufacturing an optical adhesive sheet shown in FIG. 1. FIG. 2A shows a process for forming a film of an adhesive composition, FIG. 2B shows a process for forming a base adhesive sheet, FIG. 2C shows a process for peeling off a release liner on one side, FIG. 2D shows a process for supplying a post-additive component to the base adhesive sheet, and FIG. 2E shows a process for laminating the release liner to the adhesive sheet. As an embodiment of the present invention, the adhesive sheet (10) has a sheet shape of a predetermined thickness as shown in FIG. 1 and spreads out in a direction orthogonal to the thickness direction (H) (plane direction). The adhesive sheet (10) has an adhesive surface (11) (first adhesive surface) and an adhesive surface (12) (second adhesive surface) on the opposite side from the adhesive surface (11). FIG. 1 exemplarily shows a state in which a release liner (21, 22) is laminated to the adhesive surfaces (11, 12) of the adhesive sheet (10). The release liner (21) is in contact with the adhesive surface (11) in a way that allows it to be peeled off. The release liner (22) is in contact with the adhesive surface (12) in a way that allows it to be peeled off. When the adhesive sheet (10) is used, the release liners (21, 22) are each peeled off from the adhesive sheet (10) at a predetermined timing. In this embodiment, the adhesive sheet (10) is a sheet-shaped pressure-sensitive adhesive formed from an adhesive composition. The adhesive composition contains a base polymer with an acid value of 50 mgKOH/g or less and a metal complex black dye. That is, the adhesive sheet (10) contains a base polymer with an acid value of 50 mgKOH/g or less and a metal complex black dye. Examples of base polymers include acrylic polymers, polyurethane polymers, polyamide polymers, and polyvinyl ether polymers. The base polymer may be used alone or in combination of two or more types. In order to ensure good adhesion and transparency in the adhesive sheet (10), an acrylic polymer is preferred as the base polymer. The acrylic polymer is a copolymer of monomer components containing (meth)acrylic acid esters in a ratio of 50 mass% or more. "(meth)acrylic" means acrylic and/or methacrylic. The (meth)acrylic acid ester is preferably an (meth)acrylic acid alkyl ester, and more preferably an (meth)acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms. Such alkyl (meth)acrylate esters include, for example, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, isopentyl (meth)acrylate, neopentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, n-decyl (meth)acrylate, isodecyl (meth)acrylate, and meth.acrylate Examples include undecyl, dodecyl (meth)acrylate, n-tridecyl (meth)acrylate, isotridecyl (meth)acrylate, tetradecyl (meth)acrylate, isotetradecyl (meth)acrylate, pentadecyl (meth)acrylate, n-octadecyl (meth)acrylate, isooctadecyl (meth)acrylate, and nonadecyl (meth)acrylate. Alkyl esters of (meth)acrylate may be used alone or in combination of two or more types. Alkyl esters of (meth)acrylate are preferably at least one selected from the group consisting of methyl methacrylate (MMA), n-butyl acrylate (BA), and 2-ethylhexyl acrylate (2EHA). The proportion of (meth)acrylate alkyl ester in the monomer component is preferably 55 to 99.9 mass%, more preferably 60 to 99.5 mass%, and even more preferably 62 to 99 mass%. The proportion of (meth)acrylate alkyl ester in the monomer component is preferably 55 mass% or more, more preferably 60 mass% or more, and even more preferably 62 mass% or more. When the proportion of (meth)acrylate alkyl ester is greater than or equal to the above lower limit, basic properties such as adhesiveness can be appropriately expressed in the adhesive sheet (10). In addition, the proportion of (meth)acrylate alkyl ester in the monomer component is, for example, 99.9 mass% or less, 99.5 mass% or less, or 99 mass% or less. The monomer component may include a copolymerizable monomer capable of copolymerizing with an alkyl (meth)acrylate ester. Examples of copolymerizable monomers include monomers containi