Adhesive

Abstract

An adhesive obtained by compounding a cross-linking agent to an acrylic resin composition comprising a silane-based compound and the following acrylic resins (1) and (2), wherein the content of acrylic resin (1) is 10 to 50 parts by weight based on 100 parts by weight of the total amount of the acrylic resin (1) and acrylic resin (2); acrylic resin (1): an acrylic resin having a molecular weight of 50,000 to 500,000 and containing a structural unit derived from a monomer (a) (structural unit (a)); acrylic resin (2): an acrylic resin having a molecular weight of 1,000,000 to 1,500,000 and a molecular weight distribution (Mw / Mn) of 5 or less, and containing the structural unit (a) as the main component and a structural unit derived from a monomer (b) (structural unit (b)); (a): a (meth)acrylate of the formula (A) (b): a monomer containing one olefinic double bond and at least one polar functional group selected from the group consisting of a carboxyl group, hydroxyl group, amide group, amino group, epoxy group, oxetanyl group, aldehyde group and isocyanate group in the molecule.

Description

technical field The present invention relates to an adhesive. Background technique A liquid crystal cell generally used in a liquid crystal display, such as a TN liquid crystal cell (TFT), an STN liquid crystal cell (STN), etc., has a structure in which a liquid crystal component is sandwiched between two glass base materials. Optical films such as polarizing films, phase retardation films, and the like are laminated on the surface of a glass substrate through an adhesive mainly composed of acrylic resin. An optical laminate composed of a glass substrate, an adhesive, and an optical film in the order of lamination is usually produced by the following method: first, an optical laminated film having an adhesive layer consisting of layers An adhesive composition pressed on an optical film; then, a glass substrate is laminated on the surface of the adhesive layer. Such an optical laminated film tends to generate curl or the like due to a large dimensional change due to expans...

AI Technical Summary

Problems solved by technology

However, since peeling or fogging occurs on the surface of the glass substrate (base plate) when the optical laminate is subjected to 100 cycles of 60°C → -20°C → 60°C, the pass-through is mainly caused by the weight average molecular weight of 100,000 and The problem that the durability of the optical laminate obtained by laminating an optical film with an adhesive composed of an acrylic resin having a weight average molecular weight of 1,050,000 is poor

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