Cover window for flexible display device and flexible display device

A cover window for a flexible display device comprising a laminate including a substrate, a first hard coating layer and a second hard coating layer,

• wherein the substrate is a light-transmitting substrate or polymer substrate,
• wherein the first hard coating layer is formed on one surface of the substrate and the second hard coating layer is formed on a surface of the substrate opposite to the one surface,
• wherein a ratio of a modulus of the first hard coating layer to a total modulus of the laminate is 1.5 to 2.0,
• wherein a surface pencil hardness measured from the first hard coating layer side is at least 5H based on 750 g,
• wherein the total modulus of the laminate is measured by applying a strain rate of 12.5 mm/min according to ISO 527-3, and
• the modulus of the first hard coating layer is measured at a strain rate of 0.05/s by applying a target load of 45 mN according to ISO 14577-1 and applying a target depth of 400 μm from the first hard coating layer,
• wherein the first hard coating layer includes a binder resin containing a cured product of a monomer mixture including a 6- or less functional (meth)acrylate compound and a 8- or more functional (meth)acrylate compound, and fine inorganic particles dispersed in the binder resin,
• wherein a weight ratio of the 6- or less functional (meth)acrylate compound and the 8- or more functional (meth)acrylate compound is 1:3 to 1:9,
• wherein the ratio of the modulus of the first hard coating layer to the total modulus of the laminate is 0.223 to 0.338 higher than the ratio of the modulus of the second hard coating layer to the total modulus of the laminate, and
• wherein the light-transmitting substrate has an elastic modulus of at least 5 GPa as measured by applying a strain rate of 12.5 mm/min.