▎ 摘　　要

NOVELTY - Adhesive composition comprises an acrylic copolymer having a refractive index of 1.55-1.70. USE - The adhesive composition is used for preparing an adhesive sheet, and is used for forming an adhesive layer for an optical member for a display device (all claimed). The composition is used as an optical adhesive. The adhesive sheet or layer is used as an optical adhesive film. The optical member may include, a touch panel, a window, a polarizing plate, a color filter, a retardation film, an elliptically polarizing film, a reflective film, an anti-reflection film, a compensation film, a brightness enhancing film, an alignment film, light diffusion film, glass shatter prevention film, surface protection film, plastic LCD substrate, indium tin oxide (ITO), and transparent electrode films such as fluorinated tin oxide (FTO), aluminum dopped zinc oxide (AZO), carbon nanotube (CNT), silver nanowire, and graphene. The display device includes a LCD, electroluminescent (EL) display devices, plasma display panels (PDPs), field emission displays (FEDs), and organic LED displays. ADVANTAGE - The composition has improved step water absorption, has improved step absorption as compared to the conventional adhesive composition, and exhibits excellent reliability over a wide temperature range. The composition has improved haze properties as compared to the conventional adhesive composition, and has improved refractive index as compared to the conventional adhesive composition, and has improved visibility without including a separate high refractive index pattern layer. The composition can prevent an increase in the viscosity of the crude liquid compared to the conventional adhesive composition, and processability may be further improved. The adhesive sheet can exhibit a high refractive index without including an excessive amount of nanoparticles, and have an advantage in terms of optical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an adhesive sheet prepared by using the adhesive composition.