Adhesive agent and adhesive sheet

Abstract

Disclosed is an adhesive agent characterized by comprising an acrylic copolymer (A) and a cross-linking agent (B), wherein the acrylic copolymer (A) comprises 30 to 77 mass% of a constituent unit (a1) derived from an alkyl acrylate monomer having a C5-20 alkyl group, 20 to 60 mass% of a constituent unit (a2) derived from a (meth)acrylate monomer containing an alicyclic group, 0.01 to 5 mass% of a constituent unit (a3) derived from a monomer containing a tertiary amino group induced from (meth)acrylic acid, and 0.1 to 10 mass% of a constituent unit (a4) derived from a monomer containing a functional group (which is different from a tertiary amino group). The adhesive agent can exhibit a satisfactory adhesion force to a material to be adhered regardless of the level of polarity of the surface of the material, can achieve the smooth cross-linking reaction with the cross-linking agent, and can have a decreased stabilization period without the need of using any heavy metal that has concerns about adverse influence on the environments.

Description

technical field [0001] The present invention relates to an adhesive and an adhesive sheet. [0002] This application is based on Japanese Patent Application No. 2009-224039 filed in Japan on September 29, 2009, Japanese Patent Application No. 2009-280671 filed in Japan on December 10, 2009, and Japan on April 27, 2010 The priority of Japanese Patent Application No. 2010-102153 of the application is incorporated herein by reference. Background technique [0003] In recent years, as mobile terminals such as mobile phones and tablet PCs become more multifunctional, easy operation is required, and touch panels (hereinafter referred to as TP) are widely used. On the surface or inside of TP, liquid crystal displays, and optical recording media, if there are small uneven defects on the surface or interface of the part, the light will be scattered, refracted, and reflected on the part, which will cause blurring and reduce visibility. The problem. [0004] Therefore, in order to p...

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Problems solved by technology

[0009] In addition, when the pasting object is a resin board such as polycarbonate resin or acrylic resin, there is a problem that the interface between the resin board and the adhesive layer will be defective due to foaming in a high-temperature environment, so it is sometimes necessary to use Adhesives capable of suppressing foaming

[0029] However, in order to achieve the effect of preventing metal corrosion, the adhesive composition described in Patent Document 3 will mix benzotriazole or its derivatives as an essential component of the adhesive composition, but there are concerns about the presence of benzotriazole and its derivatives. Bleeding of derivatives may cause problems of changes in adhesive force, and there is concern about discoloration due to changes in the above components over time

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