Actinic-energy-ray-curable adhesive composition for plastic film or sheet

Abstract

Provided is an adhesive composition curable with actinic energy rays which is for plastic films or the like and which has low viscosity and excellent curability, has excellent adhesion to various plastic films or the like, in particular, hydrophilic plastic films or the like, and has sufficient performance even in applications where extreme durability is required. The adhesive composition curable with actinic energy rays, which is for use in plastic films or sheets, is a composition comprising curable components and a polymerization initiator, wherein the curable components comprise component (A), which is a compound having two or more epoxy groups (10-80 wt.% of the curable components), and component (B), which is a compound having an ethylenically unsaturated group (20-90 wt.%), and contains substantially no cationically polymerizable compound containing a (meth)acryloyl group, and the polymerization initiator comprises component (C), which is a cationic photopolymerization initiator (0.1-20 wt.%), and component (D), which is a free-radical photopolymerization initiator (0.1-20 wt.%). Also provided is a process for producing the adhesive composition.

Description

technical field [0001] The present invention relates to an active energy ray-curable adhesive composition capable of adhering various plastic films or sheets by irradiation with active energy rays such as electron rays or ultraviolet rays. The composition of the present invention is suitable for use in plastic films or sheets. Adhesion of thin-layer adherends is further suitable for production of various optical films or sheets used in liquid crystal display elements and the like, and can be applied in these technical fields. [0002] It should be noted that, in this specification, acrylate and / or methacrylate are represented as (meth)acrylate, acryloyl and / or methacryl are represented as (meth)acryloyl, and acrylic and / or methacrylic are represented as (meth)acryloyl, And / or methacrylic acid is indicated as (meth)acrylic acid. [0003] Hereinafter, unless otherwise specified, plastic films or sheets are collectively referred to as "plastic films and the like", and films and ...

AI Technical Summary

Problems solved by technology

[0005] The adhesive composition used in this method usually contains a large amount of solvent in order to make the coating amount of the composition uniform. Therefore, a large amount of solvent vapor evaporates during drying, and toxicity, handling safety, and environmental pollution become problems.

In addition, this adhesive composition has a problem that, immediately after lamination of the thin-layer adherend, in post-processing steps such as heat sealing for bonding the obtained laminated film, scribing process for making grooves, etc., Delamination between thin adherends

[0026] The composition disclosed in Patent Document 7 contains a cationic polymerizable compound having a (meth)acryloyl group as an essential component in a specific ratio. Shrinkage is not too small, therefore, the generation of stress on the interface cannot be suppressed, so it is clear that it is difficult to obtain sufficient peel strength through the base material

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