An embodiment of the present invention provides an electrical steel sheet including: an upper adhesive layer positioned on an upper surface of an electrical steel sheet; and an lower adhesive layer positioned on a lower surface of the electrical steel sheet, wherein the upper adhesive layer has a pencil hardness of F or lower, and the lower adhesive layer has a pencil hardness of H or higher.

A hydrophobic binder/adhesive, for treating a substrate, may include about 60% to 98.9% by weight bulk polymer selected from one or more monomers associated with styrene, vinyl acetate, acrylic acid ester, methacrylic acid esters, ethylene, or butadiene; about 0.1% to about 10.0%, by weight of one or more hydrophobic monomers selected from stearyl methacrylate or laurel acrylate; and about 1% to about 30%, by weight of one or more protective colloids associated with a hard resin polymer. The hydrophobic binder/adhesive may increase resistance to wetting of the substrate when expose to moisture, and increases durability of the substrate.

A moisture-curing two-component composition consisting of a component A containing at least one polyoxyalkylene, polyolefin and/or polyacrylate prepolymer having at least one hydrolysable silane group and at least one solid inert additive selected from hydrocarbons, polyesters or polyamides, a component B containing at least one crosslinking compound for the prepolymers, and auxiliary substances and additives in one or both components, the component A and the two-component composition each having hot-melt adhesive properties.

An embodiment of the present invention provides an electrical steel sheet including: an upper adhesive layer positioned on an upper surface of an electrical steel sheet; and an lower adhesive layer positioned on a lower surface of the electrical steel sheet, wherein the upper adhesive layer has a pencil hardness of F or lower, and the lower adhesive layer has a pencil hardness of H or higher.

An adhesive composition is disclosed that includes styrene, polybutadiene, sulfurous ester, isopropenyl toluene, and methylphenylacetylene. A cured product of the adhesive composition has a relative permittivity of at least about 2.0 but not more than about 2.5 wt %. Using the adhesive composition as an antenna film adhesive layer between a display panel and an antenna film or between a functional layer and the antenna film may provide a small thickness of the adhesive layer and improved reliability of a touch sensor and an antenna.