RESIN COMPOSITION FOR OPTICAL SHEET STATE ADHESIVE CONTAINING POLYMER EPOXY RESIN, ADHESIVE FOR OPTICAL SHEET FORMED OF THE SAME, CURED ARTICLE THEREOF, AND MANUFACTURING METHOD OF POLYMER EPOXY RESIN USED FOR THE COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a relatively low viscosity resin composition containing a polymer epoxy resin suitable for an optical sheet state adhesive good in handling ability during molding and good in film property and sheet molding performance even when a blended percentage is increased and excellent in optical properties.SOLUTION: There is provided a resin composition for transparent sheet state adhesive containing a polymer epoxy resin obtained by reacting a bifunctional epoxy resin (a) and a bifunctional phenolic compound (b), and a curable resin component, where the polymer epoxy resin is obtained by polymerizing at a reaction temperature of 120 to 165°C by using the bifunctional epoxy resin (a) which is a bisphenol A type epoxy resin having an epoxy equivalent of 170 to 200 g/eq. and/or a bisphenol F type epoxy resin having an epoxy equivalent of 150 to 180 g/eq. and the bifunctional phenolic compound (b) which is bisphenol A and/or bisphenol F with a molar ratio of (a)/(b)=1.001/1 to 1.1/1, using at least one kind of quaternary ammonium salt compound, quaternary phosphonium salt compound, or phosphine compound as a reaction catalyst, and using an organic solvent having the boiling point of 100°C or more and steam pressure at 20°C of 0.6 kPa or more of 3 to 70 mass% based on the total charge amount as a reaction solvent, and a skeleton of bisphenol F in the polymer epoxy resin is 35 to 55 mol% based on the total skeleton, and a Hasen unit color tone of 50 mass% varnish of methylethyl ketone is 50 or less. There is also provided a cured article thereof, an adhesive for optical sheet obtained therefrom and a manufacturing method of the polymer epoxy resin.SELECTED DRAWING: None