| abstract |
An object of the present invention is to obtain, as a base film for a light diffusion plate, a film which is excellent in productivity and optical characteristics and also has adhesiveness. The composite film has a biaxially oriented polyester film made of polyethylene terephthalate as a base layer, and at least one surface of the base layer is coated with an easily adhesive coating. The optical properties of the composite film are b * value of -1 to 1, haze value of 2% or less, and total light transmittance of 88% or more. The thickness of the composite film is 20 to 250 μm. The easily adhesive coating film is formed from a copolymerized polyester resin having a glass transition temperature of 40 to 80 ° C., fine particles having an average particle diameter of 20 to 150 nm, and an acrylic resin and / or an acryl-urethane copolymer. Become. [Selection diagram] None |