abstract |
(57) [Abstract] [PROBLEMS] To provide a UV-curable waterproof coating material for a printed circuit board, which has a low water absorption rate and is excellent in moisture resistance and acid resistance, and a cured product thereof. [Structure] Di (meth) acrylate (A) represented by the formula and A waterproof coating material for a printed circuit board, which comprises a photopolymerization initiator (B), and a cured product thereof. |