Patent ID: 8367157

Claim:
A process for preparing a coated coiled metal sheet, comprising the following steps: (1) decoiling of a coiled metal sheet; (2) coating the metal sheet with a radiation curable composition; (3) curing the radiation curable composition; and (4) recoiling the coated metal sheet, wherein the radiation curable composition comprises at least one radiation curable oligomer having an amount of polymerizable ethylenically unsaturated groups of at least 0.3 meq/g and responding to following structure (I) (C)—(B)-(A)-[(B)(C)] x wherein (A) is the residue of one or more hydroxyl functional polyester having a molecular weight M N of higher than 900, a glass transition temperature T G and/or melting temperature T m of less than 30° C., and which is obtained from an acid constituent comprising at least 75 mole % of saturated aliphatic polyacid having from 4 to 14 carbon atoms and, optionally, 0 to 25 mole % of another polyacid, and an alcohol constituent, (B) is the residue of one or more polyisocyanate, (C) is the residue of one or more ethylenically unsaturated hydroxyl compound, and x is from 0.5 to 10, and wherein said radiation curable composition is substantially free of water and volatile organic compounds.