| abstract |
40-95 mass% of block B content represented by Formula: A1-B-A2 which Tg combined the methacrylic acid alkylester polymer block A1 and A2 of 100 degreeC or more, and the acrylic acid alkylester polymer block B whose Tg is -20 degrees C or less, A pressure-sensitive adhesive composition for an optical film containing an acrylic triblock copolymer (I) having no MCO 50,000 to 300,000 and an NCO reactive functional group having a molecular weight distribution of 1.0 to 1.5 and an isocyanate compound, based on the mass of the solid content of the pressure-sensitive adhesive composition, The adhesive composition for optical films whose content of a block copolymer (1) is 60 mass% or more, and whose content of an isocyanate compound is 0.0015 mass% or more and less than 0.35 mass% in conversion of NCO group. |