Polymer-coated multi-layer material and process for producing it

A process for applying coatings to a multilayer material comprising:

• providing a supply of heat-activated supporting film having a defined shrinkability on a polyester substrate having a first surface and a second surface;
• feeding the substrate through a corona discharge unit to modify the first surface of the substrate;
• immediately thereafter applying a polymerizable polyurethane polymer coating mixture obtained by reacting a polymer having hydroxyl groups with a hydroxyl number less than 5 and a linear polyisocyanate in a ratio of 20:1 with reference to solid polyurethane polymer, at least one solvent, and one or more additives to the first surface of the substrate, wherein said additive is selected to be a catalyst to facilitate polymerization of the coating mixture in less than about 48 hours, a pigment, a colorant, or a mixture thereof;
• drying the substrate to vaporize the at least one solvent and polymerize the coating mixture, wherein the first substrate is sufficiently modified to increase adhesion between the coating mixture and the first surface of the substrate;
• cooling the coated substrate;
• and
• storing the substrate.