PURPOSE: To improve the corrosion preventive properties by incorporating an organic film forming binder and a specified water-insoluble salt.
CONSTITUTION: A keto-acid of formula I (wherein (a) is 1 to 5, R represents H, halogen, nitro, cyano, a CF3 group, 1-15 C alkyl, or the like, when a is 2 to 5, adjacent R's may be an atomic group required to form a fused benzene ring or a cyclohexyl ring, and (n) is 1 to 10) and an amine of formula II (wherein X, Y, and Z each represent 4-24 C alkyl that may be interrupted with one or more O, phenyl, 7-9 C phenylalkyl, or the like and X, Y, and Z are not H simultaneously) are reacted at 30 to 130°C to obtain a water-insoluble salt. Then 0.01 to 20 wt.% of the water-insoluble salt is added to an aqueous dispersion containing an organic film forming binder (e.g. epoxy resin).
EMIIRU FUIRITSUPUSU
ROBAATO KURAIGU WATSUSON