| abstract |
A method of masking electronic devices such as printed circuit boards during additional processing of the board, such as with solvents, is improved when a maskant of polyester urethane acrylate based on aromatic isocyanate and having 0.02 to 0.08 unsaturation equivalents per 100 grams, hydroxypropylmethacrylate, 2-hydroxy-2-methyl-1-phenylpropan-1-one and amorphorus silica is used. The mask is obtained by exposing the maskant to ultraviolet radiation. The mask is tough, solvent resistant, and removable in one piece. |