Method for producing a continuous sheet having optical functions

A method for producing a continuous sheet having optical functions comprising the steps of:

• extruding a melted thermoplastic resin between a continuous release sheet having a three-dimensional pattern having optical functions on its surface and any one selected from a cooling roll with a mirror surface, a cooling roll with an uneven pattern, another release sheet having a three-dimensional pattern or other sheet having optical functions which has a three-dimensional pattern or does not have a three-dimensional pattern,
• transferring the three-dimensional pattern of the release sheet or mirror surface or uneven pattern of the cooling roll or the three-dimensional pattern of another release sheet or the other sheet on a surface of the thermoplastic resin or simultaneously transferring and laminating the other sheet, and
• cooling and removing the continuous release sheet, wherein
• the release sheet comprises a composite release sheet composed of a curable resin on which a three-dimensional pattern having the optical functions is formed, and a substrate and a change in a surface-gloss of a layer on which the three-dimensional pattern is formed, is not more than 30% in pressing a hot plate heated to 160° C. under a force of 20 kg/cm2 for 3 seconds and the release sheet may be wound in a form of cylinder of not more than 12 inches in diameter.