| abstract |
The subject of the present invention is to provide an adhesive sheet that exhibits excellent step followability and excellent durability even when the interval between the steps is narrow, or when the height or depth of the uneven shape constituting the step is large . The present invention relates to an adhesive sheet, the adhesive sheet has photo-crosslinking properties, and the adhesive sheet contains a glass transition temperature (Tg) of -50 ℃ ~ -40 ℃, a weight average molecular weight of 250,000 ~ 450,000 (A Base) acrylic copolymer, the tensile stress at 2000% before photocrosslinking is 0.3 N/mm 2 or less, and the tensile elastic modulus before photocrosslinking is 150 kPa or more and 300 kPa or less. When the tensile elasticity coefficient before photocrosslinking is set to a and the tensile elasticity coefficient after photocrosslinking is set to b, b/a is less than 3.0. |