Resin composition, pressure-sensitive adhesive composition, pressure-sensitive adhesive layer, pressure-sensitive adhesive sheet, and surface protective film

Abstract

Provided is a resin composition that can serve as a pressure-sensitive adhesive composition that is a material for forming a pressure-sensitive adhesive layer containing a polyurethane-based resin, the resin composition having a sufficiently long pot life in a stage where the resin composition is stored as it is, while allowing a cross-linking reaction between a polyol and a polyfunctional isocyanate compound to rapidly progress upon formation of a pressure-sensitive adhesive layer through the use of a pressure-sensitive adhesive composition containing the resin composition. Also provided is a pressure-sensitive adhesive composition formed of such resin composition. Also provided is a pressure-sensitive adhesive layer formed through the use of such pressure-sensitive adhesive composition. Also provided are a pressure-sensitive adhesive sheet and a surface protective film each including such pressure-sensitive adhesive layer. The resin composition includes: a polyol (A) having at least two OH groups; a polyfunctional isocyanate compound (B); a catalyst (C); and a compound (D) that undergoes keto-enol tautomerization, in which: a content ratio of the polyfunctional isocyanate compound (B) with respect to 100 parts by weight of the polyol (A) is 1 part by weight to 100 parts by weight; and the catalyst (C) includes an iron-based compound containing iron as an active center thereof.

Description

technical field [0001] The present invention relates to a resin composition having excellent pot life. The present invention also relates to pressure-sensitive adhesive compositions containing such resin compositions. The present invention also relates to a pressure-sensitive adhesive layer formed by using such a pressure-sensitive adhesive composition. The present invention also relates to a pressure-sensitive adhesive sheet and a surface protective film each comprising such a pressure-sensitive adhesive layer. Background technique [0002] Optical members and electronic members such as LCDs, organic EL displays, touch panels using such displays, lens portions of cameras, and electronic devices may each have a pressure-sensitive adhesive sheet or a surface protective film usually adhered to its exposed surface side , to prevent, for example, flaws on its surface during processing, assembly, inspection, transportation, etc. Such a pressure-sensitive adhesive sheet or surf...

AI Technical Summary

Problems solved by technology

However, a pressure-sensitive adhesive sheet or surface protective film using an acrylic resin in the pressure-sensitive adhesive layer has poor wettability, so when the pressure-sensitive adhesive sheet or surface protective film is adhered by hand, there is a problem between the adherend and the sheet. or trap air bubbles between membranes

In addition, when an acrylic resin is used in a pressure-sensitive adhesive layer, there is a problem that adhesive residue is easily generated at the time of peeling, so that when a pressure-sensitive adhesive sheet or a surface protective film is used to protect a member in which the introduction of foreign matter is not particularly desired Problems such as the surface of optical components or electronic components

Therefore, in the formation of the pressure-sensitive adhesive layer, the surface of the pressure-sensitive adhesive layer becomes rough or its thickness varies, and in addition, the pressure-sensitive adhesive properties of the formed pressure-sensitive adhesive layer are also adversely affected

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