Coating composition

Unsaturated polyester (B) being the reaction product of:

• an acid constituent comprising from 50 to 90 mole percentage of terephthalic acid and/or isophthalic acid, from 10 to 50 mole percentage of one or more unsaturated diacid(s) or the anhydride thereof, and from 0 to 30 mole percentage of one or more saturated aliphatic, saturated cycloaliphatic or aromatic diacid(s) or their anhydride, and
• a glycol constituent, comprising from 5 to 30 mole percentage of one or more aliphatic and/or one or more cycloaliphatic diol(s), and from 70 to 95 mole percentage of one or more aliphatic polycyclic diol(s),
• and having
• a Weight Average Molecular Weight of at least 15,000 g/mol, as measured by Gel Permeation Chromatograph using tetrahydrofuran as solvent,
• a glass transition temperature, as measured by Differential Scanning Calorimetry, according to DIN EN 61006, method A, of at least 60° C., and
• an unsaturated equivalent weight comprised between 300 and 6,000 g/equiv.