Patent ID: 8481623

Claim:
A liquid radiation-curable coating composition comprising (A) vinylphosphonic acid, (B) at least one radiation-curable compound having precisely one free-radically polymerizable group, (C) at least one radiation-curable compound having precisely two free-radically polymerizable groups, and (D) optionally, at least one radiation-curable compound having more than two free-radically polymerizable groups, wherein the sum of the free-radically polymerizable groups in the compounds (D), as a proportion of the total sum of the free-radically polymerizable groups in the compounds (A), (B), (C), and (D), is not more than 20 mol %, wherein the amount of vinylphosphonic acid (A), based on components (A), (B), (C), and (D), is 0.1% to 8% by weight.